JPS591617B2 - Braking mechanism for road vehicles equipped with anti-slip wheels - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a braking mechanism for road vehicles equipped with anti-slip wheels.

A braking mechanism for a road vehicle equipped with a wheel anti-slip circuit according to the present invention includes a sensor device that generates a signal indicating the rotational deceleration of a wheel of a vehicle, and a sensor device that is connected to the sensor device so that the rotational deceleration signal detects slippage. a brake release device for energizing a solenoid forming part of a hydraulically actuated actuator to release the brake when indicating an impending condition; a switch device operable by said actuator when said actuator is in a rest state; and an ignition device. and a test circuit operable for a predetermined period of time to provide a signal simulating a slipping condition to the brake release device when the switch is closed, the switch device being deactivated as a result of operation of the actuator. The switching device is configured to be connected to the test circuit so as to immediately deenergize the solenoid for a predetermined test period and return the actuator to its resting state, and the test circuit an anti-slip circuit that detects the release and resumption of operation of a switch device, and prevents the operation of a wheel anti-slip circuit if the release or resumption of operation does not occur in response to the release and resumption of operation; It is characterized in that it is connected to an actuation blocking means.

Preferably, the test circuit is activated for the period of time each time the vehicle's ignition switch is closed.

Preferably, the sensor device is a sensor for one wheel and includes a sensor that generates a signal corresponding to the rotational speed of the wheel, and a differentiation circuit to which the signal is applied, and the differentiation circuit is The output signal of the differentiator circuit generates an output signal indicating the rotational deceleration of the wheel, and the output signal of the differentiator circuit is applied to an amplifier which excites a solenoid and operates the actuator when the signal value exceeds the predetermined value. , said actuator, when actuated, acts to actuate a switch device that provides power to said test circuit, which then demagnetizes said solenoid to return the actuator to a resting state; If the actuator is not actuated or returned to the rest state as detected by the test circuit, then the test circuit detects whether or not the wheels are free from slipping at the end of the specified period of time. Blocks the circuit and converts the braking mechanism to normal braking.

In many configurations, the differentiating circuit, when first connected to the power supply circuit, serves to issue a signal to actuate the actuator, and the test circuit therefore simply detects actuation of the actuator and then This allows the actuator to return to its rest state.

However, if necessary, the test circuit can include a device for actuating the actuator independently of switching on the differentiating circuit.

More preferably, the test circuit also monitors that the differentiator circuit is operating satisfactorily, and if the actuator or the differentiator circuit is not operating satisfactorily during the test period, the test circuit also monitors the operation of the wheel at the end of said period of time. This stops the anti-slip circuit from operating.

Preferably, the same test circuit is used to test multiple fluid operated actuators within the control mechanism.

Preferably, the test circuit has a switch device biased to the conductive side, which prevents activation of the wheel anti-skid circuit when conductive, and the switch device is turned off via a first deterrent circuit for a predetermined period of time. After the predetermined period of time has elapsed, it is held off via a second deterrent circuit, and if the test results are satisfactory, only the second deterrent circuit is activated. .

Also, in some configurations, the solenoid can be energized only when the brake is applied, and in this case the test circuit is configured to energize the solenoid so that the actuator is actuated. It has a device that can be operated for a certain period of time.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.

Referring first to FIG. 1, the four wheels of the vehicle are schematically shown, namely the front wheels 21.22 and the rear wheels 23.24.
It is.

The brake associated with each wheel is indicated by the letter a appended to the wheel reference number, and each wheel is further associated with a sensor for generating a signal at a frequency proportional to the rotational speed of that wheel.

Each sensor is indicated by a symbol attached to the wheel reference number.

When the brake pedal 25 of the road vehicle is depressed, brake fluid is supplied via the actuators 26, 27 to the brakes of the front wheels 21, 22, respectively, and brake fluid is also supplied via the actuator 28 to the rear wheel brakes.

If the wheel anti-skid mechanism does not operate, actuator 2
6, 27, and 28 play no role in the operation of the circuit, and the brake fluid may be considered to flow directly to the respective brakes.

The wheel anti-slip mechanism includes a brake fluid tank 29, which supplies brake fluid to an electric pump 32 and a check valve 3.
3. Supply to the supply path 31 through the pressure switch 34.

Pressure switch 34 controls relay 35, which in turn controls operation of pump 32 to maintain the pressure in supply line 31 substantially constant.

The supply line 31 supplies fluid pressure to the inputs of three control valves 36, 37, 38, each associated with an actuator 26, 27, 28.

Valves 36, 37, and 38 are operated by solenoids 39, 41, and 38, respectively.
Solenoids 39°41.42 are associated with sensors 21b, 22b, 23b.

It is controlled by an electronic control device 43 that receives human power from 24b.

As mentioned above, when the wheel anti-skid mechanism is not activated, the brakes are used in the normal manner.

However, in the case described below, one of the solenoids is energized.

For example, assuming that the front wheel 21 is about to start slipping, the electronic control device 43 sends a signal to the solenoid 39 at that time.
The solenoid 39 is energized and the valve 36 is operated.

The valve 36 serves to control the actuator 26 to be actuated, and brake fluid to the brake 21a is cut off.

At the same time, when the brake fluid is supplied to the brake 21a, the internal chamber volume of the actuator 26 through which it passes increases, and as a result, the braking of the wheels 21 is released.

The brakes on the other front wheels 22 are released in a similar manner, but in the case of the rear wheels, in the configuration shown, if one of the rear wheels tries to slip, the brakes on the rear wheels 23, 24 are released. This is to be canceled.

FIG. 2 shows the configuration for supplying operating force (power) to the entire mechanism.

The negative terminal of the vehicle battery 51 is connected to the grounded supply circuit A.
It is connected to the.

The positive terminal of battery 51 passes through the vehicle's ignition switch 52 and relay winding 53 bridged by diode D1.
connected to one end of the

The other end of the winding 53 is connected to the supply circuit A through a safety circuit 54, and the safety circuit 54 is connected between the batteries 51 through a switch 52. Although it relies on human power, this point will be discussed later.

If there is no failure within the mechanism. The safety circuit 54 provides a passage for the winding 53 to the supply circuit A and if the ignition switch 52
When is closed, winding 53 is energized.

When energized, winding 53 closes normally open contacts 53a and connects the positive terminal of the battery to supply circuit B.

Further, a positive supply circuit C having the same potential as circuit B is connected to circuit B via a fuse 50, and further circuit C is connected to p-n
-p type) is connected to the emitter side of a transistor T1, whose collector is further connected to a positive supply circuit, and the supply circuit is regulated to a potential of 10 volts in the most common case of a 12 volt system. Ru.

The circuit A is connected through a pair of series resistors R1, R2 and a capacitor C1.

The connection point between resistors R1 and R2 is connected to the base of an n-'-p-n type transistor T2 via a parallel-connected Zener diode Z1 and a capacitor C2.
The base of 2 is further connected to circuit A via a resistor R3.

The emitter of the transistor T2 is connected to the circuit A, and its collector is connected to the circuit via a resistor R4 and to the n-p
- connected to the base of n-type transistor T3.

The base of transistor T3 is connected to circuit A via capacitor C3, and its collector is connected to the base of transistor T1 via resistor R5 and to circuit A via resistor R6.

The emitter of transistor T3 is connected to circuit A.

Transistor T3 is a transistor T that applies a base current to transistor T1 to control conduction of transistor T1.
The conduction of transistor T3 is controlled by transistor T2, so that when the circuit voltage rises above 10 volts, an increased base current flows through transistor T2, removing base current from transistor T3, thus reducing the base current flowing through transistor T1. , the potential of the circuit also drops.

If the potential of the circuit drops below O volts, the resulting reduced base current of transistor T2 increases the base current to transistor T3, thus increasing the conduction of transistor T1.

FIG. 2 also shows the vehicle's brake switch 55, which is connected across the battery 51 in series with the vehicle's brake light 56.

Note that the lamps 56 are connected in parallel. switch 5
5 and the lamp 56 are connected through a series diode D2 and a resistor R7 to the base of an n-'-pn type transistor T4, and the emitter of the transistor T4 is connected to the circuit A
and the collectors are each connected to circuit B via a relay winding 57 bridged by a diode D3.

Whenever the winding 57 is energized, it serves to close the normally open contact 57a connected between the supply circuit B and the further positive supply circuit E.

Therefore, circuit E is active only when transistor T4 conducts.

Transistor T4 conducts not only when switch 55 is closed, but also for a short period when timing circuit 58 is energized as described below.

Positive potential supply circuits B, C, D, and E are all under the control of relay 53.

The emitter of transistor T1 is Zener diode Z2
It is connected to circuit A via.

Now, referring to the block diagram of the present mechanism shown in FIG. 3, the wheel sensor 21b associated with the wheel 21 is driven by the wheel 21 and has teeth that generate pulses in the pickup winding at a frequency proportional to the rotational speed of the wheel. Contains parts.

The above pulses are sent to a frequency-to-voltage converter 61 which generates an output in the form of a voltage depending on the rotational speed of the wheel.

This output is sent to a differentiator circuit 62, the output of which is sent via an inhibit circuit 63 to an amplifier 64 which supplies power to the solenoid 39.

The converter 61, the differentiation circuit 62, and the suppression circuit 63 are circuits.

A is powered by circuit E, while the amplifier 64 and solenoid 39 portions are powered by circuit E,A.

When the vehicle is being braked, if the human power of the amplifier 64 indicates that the rotational deceleration of the wheel 21 is such that it will cause slipping, the solenoid 39 will be energized and the brake 21a will be applied from the wheel 21. dissociated.

The same applies to other wheel-related elements, and therefore the same reference numerals are given the symbols a, b, and c.

However, both the amplifiers 64b and 64c are connected to the solenoid 4.
2, and when this solenoid 42 is energized, it releases the braking from both rear vehicles.

A safety circuit 54 is also shown in FIG.
can receive eight human powers.

In other words, that one human power is the converter 61, 613゜61b
, 61c receives human power from the sensor failure detection circuit 65.

Another input to the safety circuit 54 is received from a rear wheel lock detection circuit 66 which also receives input from the transducer.

A third human power is also received from a gate circuit 67 that detects a ground failure of the solenoids 39, 4L42, and a switch circuit 68 that monitors the operation of the pump 32 and generates an output if the pump is defective.

The actuators 26, 27, 28 each actuate a switch when energized, and the switch circuit 69 controlled by those switches provides an additional power to the safety circuit 54.

The normal operation of elements 33, 34 and 35 is detected by switch circuit 71 and provides a seventh input to the safety circuit.

And the last human power is from the test circuit 72.

Any of these human forces can activate the safety circuit 54 to demagnetize the relay 53 and cut off the power supply.

However, as will be discussed below, some of the circuits described above have a delay in operation, and some only operate when the brakes are not applied.

Next, each part of the block diagram will be explained below.

[Frequency-voltage converter]

As shown in Fig. 4, this converter has a pair of n -p -'-
It comprises n-type transistors T5 and T6, the bases of which are connected to both ends of the winding of sensor 21b via resistors R8 and R9, respectively.

The bases of transistors T5, T6 are also connected to circuit A via diodes D8 and D9, respectively, and their emitters are also connected to circuit A.

Transistor T5. T6 are resistors R10 and R11 respectively
are connected to the circuit C via the respective diodes D4.
, D5 to the circuit.

Furthermore, transistor T5. The base of T6 is resistor R11゜R
It is connected to the circuit via 12.

The collector of transistor T5 is connected in series with capacitor C6,
It is connected to the circuit through a resistor R15 and a diode D7, and similarly, the collector of the transistor T6 is connected to the circuit through a series capacitor C5, a resistor R14, and a diode D6.

The junction point of resistor R15 and diode D7 is p'-n-
Connected to the emitter of p-type transistor T8, resistor R1
4 and the diode D6 is connected to the emitter of a pnp transistor TI.

Transistor T7. The base of T8 is connected to the circuit,
Its collector is connected to circuit A via a storage capacitor CI.

This converter generates a voltage across capacitor C7 that is proportional to the rotational speed of wheel 21.

As the wheel rotates, the potential at the top of the winding of sensor 21b becomes alternately positive and negative relative to the potential at the bottom of the winding.

When the potential at the top of the winding becomes positive, the transistor T6
is turned off, but transistor T5 is turned on by the current flowing through resistor R8.

Then, current flows through the diode DI, resistor R15, capacitor C6, and transistor T5, and the current flows through the capacitor C6.
The top plate of is charged positively and the bottom plate is negatively charged.

When the top of the winding of sensor 21b is negative with respect to the bottom of the winding, transistor T5 is turned off and the lower plate of capacitor C6 is connected to supply circuit C.

As a result, the upper plate of capacitor C6 becomes at a high positive potential, turning on transistor T8.

Capacitor C6 therefore discharges into storage capacitor CI.

Then, transistor T6 becomes conductive, and capacitor C5 is charged via diode D6, resistor R14, and transistor T6.

When transistor T5 is turned on again, capacitor C5
is connected to circuit C through resistor R13, turning on transistor T7, so that capacitor C5 also discharges into storage capacitor C7.

Two outputs are taken from the illustrated circuit.

One of them is transistor T? , T8, and is directly connected to the differential circuit 62 as shown.

In addition to this, transistor T? , the collector of T8 is np
- connected to the base of an n-type transistor T9, which base is further connected to a pair of resistors R16 connected between A;
It is connected to the junction point of R18 via a resistor 17.

The collector of transistor T9 is connected to the circuit, and the emitter is connected to circuit A through a parallel circuit, one of which has a resistor R19, and the other circuit has a resistor R19 in series. It has a resistor R20 and a capacitor C8.

Capacitor C8 is bridged by resistor R21 and resistor R
20 and capacitor C8 is the sensor failure detector 65.
It is connected to the.

The above-mentioned human inputs to these circuits 62, 65 are indicated by terminals 75, 76, which indicate that the following figures (fifth
(Fig. 8).

[Differential circuit and amplifier]

FIG. 5 shows the differentiating circuit and amplifier described above, and the circuit 63
is omitted, and the purpose of the circuit 63 will be described later.

Referring to FIG. 5, terminal 75 is the input to the base of n-p-n type transistor TI9, the collector of transistor T19 is connected to the circuit, and the emitter is connected to resistor R.
22 to the circuit A, respectively.

The emitter of the transistor TI9 is further connected in series with a resistor R23.
is connected to circuit A via capacitor C9, and resistor R2
3 and capacitor C9 is connected to the gate of field effect transistor 81 via series resistor R24 and capacitor C10.

The source of transistor 81 is connected to the junction of a pair of resistors R29 and R31 connected between circuit 82 and circuit A.

The circuit 82 includes a resistor R connected in series between the circuit A and A.
25 and the junction of capacitor C13.

The drain side and gate side of the transistor 81 are connected to each other via a capacitor C11.

The drain is further connected to the collector of a pnp transistor T10, the emitter of which is connected to the circuit 82 via a resistor R26.

Circuit 82 and circuit A include diode D11゜Dlo and resistor R.
28.

The junction of diode D10 and resistor R2B is connected to the base of transistor T10.

The collector of the transistor TIO is a series resistor R23, R
43 to the circuit 82, resistors R27 and R43
The junction point of transistor T11 is connected to the base of pnp transistor T11, the emitter of transistor T11 is connected to circuit 82, and the collector is connected to circuit A via series resistors R32 and R33.

The junction of the resistors R32 and R33 is connected to the base of the n-p-n type transistor T12.
The emitter of is connected to circuit A, and the collector is connected to resistor R
34 to circuit 82.

Furthermore, the collector and emitter of transistor T12 are bridged by capacitor C12, and transistor T1
The collector of 2 is also connected to transistor 8 via resistor R44.
1, and the collector of the transistor T12 is further connected to the base of an np-n type transistor T13 via a resistor R35.

The potential on the emitter side of the transistor T13 is set by resistors R40, R41°R47 connected in series between the circuit A, and the junction of the resistors R40°R41 is connected to the emitter of the transistor T13.

The collector of transistor T13 is connected to a pair of resistors R37, R
36, and the resistors R36 and R37 are bridged by a capacitor C31.

The junction of the resistors R36 and R37 is connected to the base of a p-n-p transistor T14, its emitter is connected to the circuit, and its collector is connected to the n-p-n transistor T15 through a series resistor R38 and a diode D12. The collector of the transistor T15 is connected to the circuit E via a resistor R141, and the emitter is connected to the circuit A and the base of an n-p-n type transistor T17 via a resistor R42.

The emitter of transistor T17 is connected to circuit A, and the collector of transistor T17 is connected to circuit E via a solenoid 39, which is bridged by a resistor R39 and a diode D13 in series with this resistor R39.

Note that the signal at terminal 75 is now a voltage indicative of the rotational speed of the wheel; this voltage turns on transistor TI9, which in turn turns on transistors 81° TIO, T11 . Power is applied to an amplifier composed of transistor T12, and the amplifier has a feedback circuit via a resistor R44 between the collector of transistor T12 and the gate of transistor 81, and further differentiates the power and outputs the power to the collector of transistor T12. It serves to provide a signal representing the rate of change in the rotational speed of the wheels.

During operation, the conduction of transistor T10 is caused by diode D11.
．． DIO and resistor R28, transistor T10 is connected to transistor T10 in conjunction with transistor 81.
11, which in turn determines the conduction of transistor T12.

The potential at the collector of transistor T12 is normally an intermediate value between the potentials of circuit A and when the wheel is decelerated, the potential approaches the potential of circuit A, and when the wheel is accelerated it approaches the potential of circuit A. It is.

The potential of the emitter of the transistor T13 is set by the resistors R40, R
41 and R47, typically transistor T13
is non-conducting.

During acceleration, the potential at the collector of transistor T12 drops, so transistor T13 is still not conducting.

However, during deceleration, the potential at the collector of transistor T12 increases to a predetermined rotational deceleration of the wheel, and transistor T13 is turned on.

The predetermined rotational deceleration mentioned above is selected to such a value that the wheels are about to slip.

When transistor T13 conducts, it provides base current to transistor T14, which conducts and turns on transistors T15 and T17, turning on solenoid 39.
Excite.

When the wheel is accelerated again, transistor T13 is turned off and solenoid 39 is demagnetized.

In the case of the rear wheels, the two transistors T17 for the rear wheels have their collectors connected together.

Needless to say, if either rear wheel begins to skid, the associated transistor T13 will conduct and therefore the associated transistor T14 . T15° and T17 conduct and provide input to the common rear wheel solenoid 42.

[Suppression circuit]

The purpose of this deterrent circuit is to prevent the brakes from being held in a released state unnecessarily when the vehicle is traveling on rough roads.

For example, in a vehicle traveling on a paved road, the wheels are decelerated when they land on a stone and accelerated when they come off the stone.

If the vehicle is braked at this time, the average rotational speed of the wheels will decrease.

Therefore, a deceleration signal is issued at this time.

However, as a result of the acceleration and deceleration caused by the stones, signals of acceleration and deceleration having large frequencies are superimposed on this signal.

These signals are not only of very high frequency, but are of sufficient magnitude to substantially energize solenoid 39 of FIG.

Therefore, given the condition that the average deceleration is such that the wheels are unlikely to slip, solenoid 39 should not be energized;
will be energized and demagnetized at high speeds as a result of high frequency signals from the wheels running over the stones.

Furthermore, since it takes longer to apply brakes to the wheels of a vehicle than to release them, a situation can quickly be reached where the brakes are held off virtually permanently, and therefore braking effectiveness is lost.

The suppression circuit shown in FIG. 8 is designed to overcome this drawback.

As shown in FIG. 6, the circuit is connected to the collector of transistor T12 and acts on the base of amplifier transistor T15.

The present suppression circuit includes an n-p-n type transistor T22, the emitter of which is connected to the circuit A, and the collector of which is connected to the resistor R.
49 to the circuit, the base of which is connected to the resistor R4.
8 to the collector of transistor T12, to circuit A through resistor R46, and to circuit A through a pair of series diodes D16 and D17.

The collector of the transistor T22 is connected to the junction of diodes D16 and D17 via a capacitor C14, and further connected to the n-p-n type transistor T2 via a resistor R51.
Connected to the base of 4.

Transistor T24 has its emitter connected to circuit A.

The collector of transistor T24 is connected to the base of transistor T15 via diode D12.

The collector potential of the transistor T12 is normally a circuit, A
This is the intermediate value of the potential, but it will rise during deceleration and fall during acceleration.

Normally, transistor T22 is conductive, so no base current is provided to transistor T24, and capacitor C14 is discharged.

When the wheel is decelerated, the potential at the collector of transistor T12 rises, but transistor T22 remains on.

If the deceleration exceeds a predetermined value and the brake is released, transistor T24 obviously cannot inhibit the amplifier.

When the wheel starts accelerating again, the collector potential of transistor T12 drops and transistor T22 turns off.

When transistor T22 is turned off, capacitor C14 is charged via resistor R49 and diode D17, and when capacitor C14 is charged, transistor T24 is charged.
turns on.

When the wheel accelerates, the braking is of course applied again, but when the wheel is decelerated again, the potential at the collector of transistor T12 changes to transistor T22 without capacitor C14.
rises to a level where it turns on.

However, at this stage transistor T22 is held off by the discharge of capacitor C14 for a preset time, and during this preset time the current flowing through resistors R49 and R51 holds transistor T24 on and therefore Suppress T15.

At the end of this preset time, transistor T22 is turned on again and transistor T24 is turned off.

Therefore, if the predetermined deceleration is exceeded during this preset time, the brake will not be released.

The frequency at which the brakes are released on a paving stone road is much higher than the frequency at which the brakes are released when the wheels try to slip during normal braking operation, so the above preset time is If the wheels are on a good road surface and begin to skid, and then the predetermined deceleration is exceeded twice, capacitor C14 will have completed discharging, so that transistor T24 will be turned off and the braking will be resumed. It is easily possible to select a set time that allows cancellation.

However, on a cobblestone road it may occur that the braking is attempted to be released again before the discharge of the capacitor C14 is completed, and in such a situation the required inhibiting effect is achieved by the conduction of the transistor T24.

[Safety circuit]

FIG. 7 together with a portion of FIG. 2 shows the safety circuit.

Furthermore, various human forces for the safety circuits with reference numbers 65 to 72 shown in FIG. 3 are similarly shown in FIG. 7, but as is clear from the description, FIG. 3 is a pure water map.
Some of the circuits 65 to 72 are actually just connection points or switches.

Referring to FIG. 7, the lower end of the relay winding 53 is n-p
--Connected to the collector of the n-type transistor T25,
Its emitter is connected to circuit A.

Terminal M is connected to a monitoring device (which will be explained with reference to FIG. 11) which lights an alarm lamp whenever the relay winding is not energized.

The base of the transistor T25 is connected to the emitter of an n-p-n type transistor T26, the collector of the transistor T26 is connected to the collector of the transistor T25, and the base is connected to the p-collector of an n-type transistor T27 through a resistor R54. The emitter of transistor T27 is connected to circuit A, and the collector is connected to supply circuit 82 via resistor R55.

Supply circuit 82 is connected to circuit A via capacitor C90 and to the junction of ignition switch 52 and winding 53 via resistor R53.

The collector of the transistor T27 is further connected to the base of a p-n-p transistor T28 via a diode DI9 and a resistor R56 connected in series.
The collector of has a parallel circuit, one of which has a pair of resistors R57 and R58 in series, and the other one of which has a capacitor C1.
5 is connected to circuit A through a parallel circuit with resistor R
The junction between 57 and resistor R5B is connected to the base of transistor T27.

The base of transistor T28 is a pair of diodes D21
, D22, and the anode is further connected to the emitter of the transistor T28 via a parallel resistor R61 and a capacitor C16.

The cathodes of diodes D21 and D22 are connected to resistors R59 and R, respectively.
60 to circuits 72 and 66.

The base of transistor T28 is connected to the collector of transistor T29 through a series connection of diode D23, resistor R67, resistor 70, and diode D28, and the emitter of transistor T29 is connected to circuit A, whose collector is connected through resistor R71. and is connected to the circuit 82.

The junction of the diode D23 and the resistor R67 is connected to the circuit 82 through a parallel circuit having a resistor R62 and a capacitor C17, respectively, and a series-connected diode D24.
and the brake light switch 55 via the resistor R63.
and the brake lamp 56.

The junction of resistors R67 and R70 is the three diodes D25
．． D26. The anode of the diode is connected to the anode of D27, and the cathode of the diode is connected to the circuit 68°67.65 through resistors R64, R65, and R66, respectively.

The junction between resistor R64 and diode D25 is connected to circuit A via resistor R68.

The junction point of resistors R67 and R70 is further connected to the collector of an n-p-n type transistor T31 via a series-connected diode D36 and a resistor R69, and is connected to the collector of an n-p-n type transistor T31.
The emitter of 1 is connected to circuit A, and the base of 3 diodes D33. D34. Connected to the cathode of D35.

Diode D33. The anodes of D34 and D35 are R, respectively.
77, R78, R79 to circuit C, the junction of which is further connected to circuit 71.

The base of transistor T29 is connected to circuit A via resistor R72 and three diodes D via resistor R73.
29, D31, and D32.

Diode D29. The anodes of D31 and D32 are R, respectively.
It is connected to circuit 82 via R74, R75, and R76, and also to circuit 69.

Finally, the emitter of transistor T28 is held at a constant potential by virtue of the connection from its emitter to the junction of a pair of resistors R81 and R82 connected between circuit 82 and A.

Consider the types of failures that are expected to occur that are monitored by safety circuits.

The function of circuit 67 is simply a connection to circuit E as shown in FIG.

As shown in Figure 3, the lower end of each solenoid is connected to circuit E.
If for some reason the solenoid shorts its lower end to ground, current will flow from circuit 82 through capacitor C17, resistor R67, diode D26 and resistor R65 to ground, thus Capacitor C17 begins to be charged.

The emitter of transistor T28 is held at a constant potential, and capacitor C17 applies that voltage to the base of transistor T28 via diode D23.

After a delay time preset by resistors R67 and R65, capacitor C17 is sufficiently charged and transistor T28
is turned on, and its transistor T2B provides base current to transistor T27.

When transistor T27 becomes conductive, transistor T26.
T25 is turned off and therefore relay 53 is demagnetized.

Additionally, once transistors T27 and T28 are turned on, current flows through resistor R56 and diode DI9 to transistors T27. Keep T28 on.

Therefore, once a fault is detected, only winding 53 is energized by opening the ignition switch and closing it again.

The above failure detection is performed only when braking is not being performed.

When the brake is applied, resistor R63 and diode D24
The connection through stops the capacitor from charging.

This inhibition applies to faults detected by all circuits 65, 67, 68, 69, 71.

Circuit 65, which will be described below, detects failures in all wheel sensors, such failures causing a ground condition.

Circuit 68 is simply a switch that is activated by pump 32 and serves to create a ground condition if the pump fails.

All three circuits 65, 67, 68 act in exactly the same way, only the delay in each of these circuits is
It is possible to make them different by appropriately selecting the values of R65 and R66.

The circuit 69 actually consists of only three switches actuated by three actuators.

Whenever one actuator is activated, the appropriate switch is activated and the diode D29. Connect one anode of D31 or D32 to the positive supply circuit.

Therefore, as soon as one actuator is actuated, the base current flows through transistor T29 and
Turn on 29.

Then, capacitor C17 is connected to resistor R70 and diode D2.
8 and transistor T29, and after a predetermined delay capacitor C17 is charged through transistors T28, T2
7 is turned on so that transistor T2 is turned on as described above.
5 is turned off.

The circuit 71 actually has three switches activated by the pressure in the supply line 31.

If any failure occurs, the diode D33. D34.
The anode of any one of D35 is connected to the positive supply circuit to turn on transistor T31.

Then capacitor C17 is connected to resistor R67 and diode D3.
6, is charged via resistor R69 and again after a predetermined delay, transistor T27. T28 turns on and transistor T
25 is turned off.

All of the above faults are monitored only when the brakes are not applied, but there are two faults that are monitored whether or not the brakes are applied.

The fault is controlled by two circuits 66, 72, which will be described below. 1 circuit 66 detects rear wheel locking and, if this occurs, connects the cathode of diode D22 to the negative supply circuit and therefore transistors T28 and T27 It turns on without delay and transistor T25 turns off again.

If the test circuit 72 indicates any fault, the test circuit 72 likewise connects the cathode of the diode I) 21 to the negative supply circuit.

Then, transistor T28°T27 is turned on again,
Transistor T25 is turned off and winding 53 is demagnetized.

[Sensor failure circuit]

Referring to FIG. 8, the series connection of diode D27 and resistor R66 shown in FIG. 7 is connected to the collector of npn transistor T32.

The collector of transistor T32 is also connected to diode D90.
It is connected to circuit C via.

The emitter of the transistor T32 is connected to the circuit A, and the base is connected to a pair of resistors R83 and R8 connected in series between the collector of the npn transistor T33 and the circuit A.
It is connected to the junction point of 4.

Transistor T33 has its emitter connected to the circuit and its base connected to the collector of npn type transistor T34.

The emitter of transistor T34 is connected to four diodes D4
1°D42. D43. It is connected to the anode of D44, and its base is connected to the diodes D37°D38. through a resistor R85.
D39. Connected to the cathode of D40.

The cathodes of diodes D37, D38, D39, and D40 are connected to diodes D41 and D4 through capacitor C18.
2. D43. These diodes form a pair, the anode of diode D37 and the cathode of diode D41 are connected to terminal 76, and similar connections are made between the other diode pairs and terminals 76a, 76b, 76c. is being done.

The terminal 76 is the terminal shown in FIG. 4, and the terminal 76a,
76b and 76c are the same as the terminals in the other three frequency-to-voltage converters.

The arrangement is now such that, if all the sensors are working properly, each wheel will rotate at the same speed so that the base and emitter of transistor T34 are at substantially the same potential.

However, if any one of the wheels rotates at a different speed than the other wheels, the potential between the base and emitter of transistor T34 increases, turning transistor T34 on.

Transistor T34 then provides base current to transistor T33, which in turn provides base current to transistor T32, closing the ground feedback circuit through diode D27 and resistor R66, and therefore, as described above, transistor T25 of FIG. Turn off.

This circuit can be designed to operate even if there is a difference in rotational speed between any pair of wheels by appropriately selecting the resistors R20 and R21 shown in FIG.

If fuse 50 melts, diode D90 turns off transistor T25.

[Rear wheel lock detection circuit]

Referring to FIG. 9, the rear wheel lock detection circuit is n −
It has a p-n type transistor T35, the emitter of which is connected to circuit A, and the base of which is connected to terminal 83.83a via resistors R86 and R87, respectively.

The collector of the transistor T35 is connected to the circuit through a resistor R88, and further connected to the circuit A through a series resistor R93 and a resistor R94, and the junction of the resistors R93 and R94 is connected to the circuit A through a resistor R88. The emitter of the transistor T37 is connected to the circuit A.

Furthermore, an np-n type transistor T36 is provided, the emitter of which is connected to the circuit A, and the base of which is connected to the resistor R89,
R90 respectively to terminals 84.84a and series connected diodes D96. Each is connected to circuit A via D97.

The collector of transistor T36 is connected to diode D96. through capacitor C20. D97, and further connected to the circuit through a resistor R91 and to the base of an n-p-n type transistor T3'8 through a resistor R92.

The emitter of transistor T38 is connected to circuit A, and its base is connected to circuit A via a resistor R95 in parallel with the collector and emitter of transistor T37.

The collector of transistor T38 provides an input to the safety circuit through resistor R60 and diode D22 shown in FIG. 7, and further through diodes D46 . It is connected to terminal 85°85a via D47.

Terminals 84 and 84a are connected to a frequency to voltage converter associated with the rear wheel.

The location of terminal 84 is shown in FIG.
It will be seen that the base of transistor T36 receives a direct signal from a suitable capacitor C7 in the rear wheel frequency to voltage converter such that the base potential of T36 depends on the rotational speed of the rear wheel.

Terminals 83 and 83a are connected to respective frequency to voltage converters associated with the front wheels.

The location of terminal 83 is also shown in FIG. 4, and since terminal 83 is connected to the emitter of transistor T9 of a suitable frequency-to-voltage converter, the potential at terminal 83 will change at terminal 84 for a given wheel speed. slightly lower than the potential applied.

The reason will be revealed later. What is even more noteworthy is that
The collector of the transistor T36 is a series diode D4.
8 and a resistor R142 to the junction between the brake lamp switch 55 and the lamp 56, and this junction is connected to the circuit A through a resistor R143.

In terms of operation, if the front wheels of the vehicle are rotating at a speed corresponding to a low vehicle speed of about 5 miles per hour, then transistor T35 is on and removes the base current from transistor T37, thus removing the base current from transistor T3.
7 is turned off and can be ignored.

If the vehicle is not braked, diode D
4B allows current to flow through the lamp 56 and through the resistor R91, which current is insufficient to light the lamp 56 but serves to ensure that the transistor T38 does not conduct, so that the circuit is effectively inoperative. in a state.

Resistor R143 provides a path for this current if lamp 56 is broken.

However, when the vehicle is braked, switch 55 is closed and diode D4B is reverse biased and plays no role in the operation of the circuit.

Resistor R142 protects diode D48 from instantaneous voltages.

When the rear wheel rotates, a signal is generated at terminal 84.84a,
The current that holds transistor T36 on and thus flows through resistor R91 flows through transistor T36, and transistor T38 is off.

At the same time, capacitor C20 discharges.

Therefore, in normal operation transistor T38 is never turned on.

However, if for some reason the mechanism fails to act on the rear wheels, and then both rear wheels begin to slip, after a short delay period during which the base drive is removed from transistor T36 and capacitor C20 is charged. , the transistor T36 is turned off and the current flowing through the resistor R91 flows through the resistor R92 and becomes the transistor T38.
Turn on.

When transistor T3B becomes conductive, a ground circuit is provided through diode D22, turning off transistor T25 and demagnetizing relay winding 53 as described above in FIG.

The conduction of transistor T38 also provides a circuit from terminals 85, 85a associated with the amplifier controlling the front wheels of the vehicle to ground.

The position of terminal 85 is shown in FIG.
When 46 conducts, it effectively shunts the base current of transistor T15 of FIG. 5 to ground, so that transistor T15 cannot conduct.

The same transistor T15 of the amplifier associated with the other front wheel
will no longer conduct, therefore the circuit to the front wheel solenoid will be disconnected.

The purpose of capacitor C20 is to ensure that if the rear wheels momentarily lock up during braking, transistor T36 remains on and transistor T3B does not conduct.

Momentary locking of the rear wheels is acceptable, but if the rear wheels lock as a result of some failure and the mechanism still operates to release them, then braking is applied again to the other wheels in the normal manner. In this case, the wheels may receive a large rotational couple, causing the entire vehicle to spin.

When the vehicle stops normally, there is of course no need to turn on transistor T38, but transistor T38 does not need to be turned on at that time.
36 is turned off.

Recalling that for the given wheel rotational speed, the signals at terminals 83 and 833 are somewhat smaller than the signal at terminals 84.84a, for this reason when the vehicle approaches a standstill, transistor T35 is more active than transistor T36. turn off before.

When transistor T35 turns off, transistor T3γ
is turned on, so that when transistor T36 is turned off, transistor T38 is not turned on.

This means that the current flowing through the resistor R92 is the transistor T.
This is because it flows through 37.

The purpose of inhibiting this circuit by diode D48 except during braking is to prevent a failure indication from occurring if the front wheels of a front wheel drive vehicle slip during acceleration.

The purpose of diodes D96 and D97 is to address the problem that it may occur that all of the vehicle's wheels momentarily lock and then unlock simultaneously.

If this problem occurs, diodes D96 and D97
Without it, transistor T38 instantaneously receives base current and turns on.

However, if diodes D96 and D97 are provided, diode D97 will be forward biased and diode D96 will be reverse biased, causing the collector potential of transistor T36 to drop rapidly, effectively inhibiting capacitor C20.

As a result, the transistor T38 cannot receive the base current instantaneously, and the above problem is overcome.

In normal operation, diode D96 is forward biased and diode D97 is reverse biased so that capacitor C20 operates as described.

[Test circuit]

FIG. 10 shows a test circuit having a timing mechanism (dimming network).

First, considering the timing mechanism, an n-p-n type transistor T39 is provided, and its base is n-p-
It is connected to the emitter of the n-type transistor T41, and the collectors of the transistors T39 and T41 are connected to the circuit C.

The emitter of the transistor T39 is connected to the circuit A via a series-connected diode D51 and a resistor R97, and its emitter is further connected to a series-connected diode D52 and a resistor R.
7 to the base of transistor T4 shown in FIG. 2, so that when transistor T39 conducts, transistor T4 is turned on by the current flowing through diode 52 and resistor R7.

The junction of diode D51 and resistor R97 is also connected to a supply circuit 99, which therefore connects transistor T3.
It is excited when 9 is on.

The base of the transistor T41 is connected in series with a resistor R98,
connected to circuit C via R99, resistors R98 and R99
The junction of is connected to the collector of the n-p-n type transistor T42, the emitter of the transistor T42 is connected to the circuit A, and the base is connected to the collector of the n-p-n type transistor T43 via the resistor R102. has been done.

Transistor T43 has its emitter connected to circuit A, its collector connected to circuit A via capacitor C21, further its collector connected to circuit C via resistor R103, and its base connected to circuit A via diode D54. A, and further connected to the collector of the transistor T42 via a series-connected capacitor C22 and a resistor R101.

The junction of capacitor C22 and resistor R101 is connected to resistor Fj98 via series-connected diode D53 and resistor R100.
and R99.

The remainder of the test circuit consists of three sets of transistors T44.
T45. T46. T47. T48. Equipped with T49.

Transistors T44, T46. Each emitter of T47 is connected to a transistor T45. T4γT49 are connected to respective collectors of transistors T45. T47. T49
Each emitter of is connected to circuit A.

The bases of transistors T45°T47 and T49 are connected to terminals 88a and 88 through resistors R104 and R105°R106.
8b, 88c, and transistors T44. T46
．． Each base of T48 is connected to a resistor R107, R108, R1
12 to the circuit 99.

The collectors of transistors T44 and T46 are diode D.
55 DEG D56 are connected to terminals 85 and 85a, respectively, and the collector of transistor T48 is connected to terminal 85b through diodes D57 and D58.

85c.

Furthermore, an n-p-n type transistor T51 is provided, the emitter of which is connected to the circuit A, and the collector of which is connected to the resistor R1.
It is connected to the circuit through 18.

The base of transistor T51 is connected to 5 through resistor R120.
diodes D59. D61, D62. D63. D
64 cathodes.

Diode D59. Each anode of D61 is connected to a resistor R113.
, R114 to the terminals 98b and 98c,
On the other hand, diode D62. D63. Each anode of D64 is connected to the circuit through resistors R115, R116 and R117, respectively.

Each resistor R115, R,116. R117 and each diode D62. D63. The junction of D64 is the transistor T49
．． T47. Each is connected to the collector of T45.

The collector of the transistor T51 is further connected to a pair of diodes D65 . Connected to the junction of D66.

The transistor T52 has its emitter connected to the circuit A, and its collector connected to the circuit through a resistor R119, and further connected to the circuit A through a capacitor C23 and the transistor through resistors R109, R110, and R111. T45. T47. They are respectively connected to the base of T49.

The base of transistor T52 is connected to n via resistor R122.
-p - It is connected to the collector of an n-type transistor T53, and the emitter of the transistor T53 is connected to the circuit A.

The collector of transistor T53 is connected to the circuit through resistor R123, and its base is connected to the collector of transistor T52 through resistor R121.

The collector of transistor T53 is connected to the collector of n-p ---nn type transistor 54 through resistor R125.

The emitter of transistor T54 is connected to circuit A, and its collector is connected to circuit A via capacitor C24 and to the base of n-p-n transistor 55.

The emitter of the transistor T55 is connected to the circuit A, and the collector is connected to the safety circuit shown in FIG. 7 via a resistor R59 and a diode D21 connected in series.

The base of transistor T54 is connected to the emitter of transistor T39 through resistor R124.

In connection with FIG. 7, it should be noted that whenever transistor T55 conducts, relay winding 53 is demagnetized.

When the ignition switch is first closed, supply circuits C, D are energized and the current flowing through resistor R99°R98 turns on transistor T41°Ta2.

Capacitor C21 initially holds transistor T42 off.

Current flows through resistor R101 and capacitor C22, turning on transistor T43, but after a predetermined period of time, capacitor C22 becomes charged and transistor T43 turns on.
is turned off.

When transistor T43 turns off, the base current flows through transistor T42, which turns on and removes the base current of transistors T41 and Ta2, thus causing transistors T41. T39 turns off.

The timing circuit thus operates for a predetermined period of time, typically one second, to provide actuation force (power) to circuit 99 and to keep transistor T4 on.

Since transistor T4 is kept on, actuating force is supplied not only to circuit B but also to circuit E leading to the amplifier, even though the brake pedal of the vehicle is not depressed at this time.

When the timer is running for the 1 second mentioned above, resistor R124
The current flowing through turns on transistor T54.

The current flowing through resistors R123 and R125 can then flow through transistor T54, and therefore transistor T55 cannot be turned on during that one second.

The purpose of this circuit is to test the operation of the wheel anti-skid mechanism for one second and to prevent the mechanism from operating if one of the predetermined faults is detected.

Note that during the delay period, it is desirable to generate a deceleration signal that operates the actuator in a simulated manner.

This can be accomplished by sending appropriate signals to each amplifier.

However, using the illustrated configuration, when the circuit is first connected to the supply circuit, each amplifier receives a signal that effectively simulates deceleration above a predetermined maximum value until the respective components have settled. , therefore the actuators operate respectively.

It will, of course, be understood that actuation of the actuator is effected by a connection to the base of transistor T4 via diode D52.

Each actuator has an associated switch which serves to provide a positive signal to terminals 88a, 88b, 88c when the actuator is actuated, and terminal 88c is connected to the actuator for the rear wheel. It is important to note that

Terminal 88a. When ssb j 88c receives the signal, transistors T45. T47. T49 turns on and at this moment circuit 99 is energized so that transistor T4
4. T46. T48 also turns on.

When transistor T44 becomes conductive, it serves to ground terminal 85 via diode D55.

5, where terminal 85 is shown in FIG. 5, and which, when grounded, clamps the base of transistor T15 of the amplifier transistor T15 associated with one front wheel, thus demagnetizing solenoid 39. and the actuator begins to return to its rest position.

Similarly, diode D56 clamps the amplifier associated with the other front wheel, and diodes D57 and D58, activated by transistor T48, clamp the two amplifiers associated with the rear wheel.

Engagement of the actuator during the one second delay period does not significantly affect the operation of the vehicle braking mechanism.

Transistor T44. T45. T46°T47. T48
．． When T49 is all conductive, diodes D62 and D6
3, the current flowing to the base of transistor T51 via D64 flows to the base of transistor T45.3. T47. When the current is not received from either diode D59 or D61, only transistor T51 is turned off.

Diodes D59 and D61 have their inputs connected to terminal 98b.

98c, and the position of terminal 98 is shown in FIG.

Terminal 98 is associated with one circuit of the rear wheel differential circuit, and if the rear wheel differential circuit is operating, the potential at terminal 98b is 1.
falls to zero for a period of seconds, thus the signal across diode D59 disappears.

Terminal 98c is of course associated with the other rear wheel differential circuit, and therefore, if the differential circuit and all actuators associated with the rear wheel are operating satisfactorily, transistor T51 will be turned off during the delay period.

When this mechanism is working satisfactorily, the amplifier is activated by diode D55. D56. D57. As soon as the actuator inch is closed again, the base current flows through the diode D62.D58 even though the rear wheel differential circuit is working satisfactorily. D63. D6
4, returns to the transistor T51, and the transistor T
51 is turned on again.

While transistor T51 is off, transistors T52 and T53 are on and off, respectively.

When the ignition switch is closed, capacitor C23 prevents transistor T53 from conducting.

However, when transistor T51 turns on again, the bistable circuit made up of transistors T52 and T53 and their associated elements switches, turning transistor T53 on and transistor T52 off.

When transistor T52 is turned off, the current flowing through resistor R119 flows through resistors R109, R110, R111, and transistors T45. T47. T49 is retained so that power supply is removed from circuit 99 and diode D55. D56. Transistors T44.D57 deactivate the amplifier during the remaining delay period. T46
．． T48 can remain conductive.

In this way, many operations have been tested during the delay period, and if the tests are normal, the circuit is left with transistor T53 turned on.

At the end of the delay period, transistor T39
and T41 is turned off, thus removing the base drive of transistor T54.

However, transistor T53 now conducts, removing the base current of transistor T55, so that transistor T55 does not conduct.

Capacitor C24 prevents transistor T55 from becoming conductive momentarily at the beginning of the test period.

If the test result is abnormal, the desired cycle is not executed, and the transistor T51 is not turned off but turned on again.

In this state, the bistable circuit remains in its normal state with transistor T52 conducting and transistor T53 off.

At the end of the delay period, transistor T54 is turned off,
Current flows through resistors R123 and R125, turning on transistor T55, thus demagnetizing the relay winding and deactivating the wheel anti-skid mechanism, leaving the vehicle's normal braking mechanism active.

FIG. 10 also shows many of the components associated with the monitoring device shown in FIG.

Therefore, circuit 99 connects battery 5 through the cathode-anode circuit of diode D96 and the vehicle starter switch 200.
1 positive terminal.

Whenever starter switch 200 is closed and the vehicle starts, circuit 99 is at a positive potential.

Also, a pair of resistors R142 and R143 are connected in series to circuits C and A.
The junction of resistors R142 and R143 is connected between p
-n The collector of the transistor T92 connected to the base of the p-type F transistor T92 is connected to the circuit 99 through the diode D95, and the emitter thereof is connected to the circuit.

The potential of the base of the transistor T92 is the resistor R142, F
tl43, and transistor T92 does not conduct if the circuit is at normal potential.

However, if the potential on the circuit falls below a preset level, typically a voltage of 11 volts, transistor T92 becomes conductive and circuit 99 is at a positive potential.

Thus, when attempting to start the engine or if the above-mentioned stable voltage supply drops below 11 volts, circuit 99 in FIG. 10 goes to a positive potential during the delay period.

[Monitoring device]

Referring to FIG. 11, the positive terminal of battery 51 is connected to a supply circuit 100 through a series connection of a vehicle ignition switch 52 and a warning lamp 81, which supply circuit 100 is connected to circuit A through a parallel connection of switches 101 and 102. has been done.

The circuit 100 is also connected to the emitter of a p-n-p transistor T98, the base of which is connected to the collector of an n-'-p-n transistor T97.

The emitter of transistor T97 is connected to circuit A via resistor R156.

The base of transistor T97 and the collector of transistor T98 are connected to each other and connected to circuit 1 through resistor R155.
00, and the base of transistor T97 is further connected to n-p-n via a plug-socket arrangement 201.
The emitter of the transistor T96 is connected to the circuit A, and the base of the transistor T96 is connected to the circuit A through a resistor R154.

The transistor T96 also has its base connected to the collector of an n'-p-n type transistor T95, whose base is connected to the circuit A via a parallel connection of a resistor R153 and a diode D99, and whose bases are each connected to a resistor. It is connected to terminal M (FIG. 2) and circuit 99 (FIG. 10) via R152 and R151.

Switches 101 and 102 are closed when the band brake of the vehicle is applied and when the level of the brake fluid tank drops below a preset position, respectively.

Even if either switch 101 or 102 is closed, the lamp 8
1 lights up.

It will be appreciated that any number of switches may be installed in parallel to provide a warning to the driver.

Other switches that may be used on vehicles include band wear switches, which indicate when the brake pads are worn, and pressure fluctuation switches, which indicate when the brake pads are worn, and pressure fluctuation switches, which indicate when two circuits are used in a system that has two hydraulic circuits. It closes when the pressures are different.

Lamp 81 also includes a pair of transistors T98, T97.
Lights up when turned on.

If the current flowing through resistor R155 is not diverted through device 201 and transistor T96, transistors T97 and T98 are turned on by this current.

Transistor T96 is normally conducted by the current flowing through resistor R154 and is therefore connected to the pair of transistors T97. T98 is turned off.

However, if a failure of the mechanism results in a potential at terminal M, then transistor T95 turns on and removes the base current from transistor T96, thus lighting lamp 81.

Transistor T95 is also turned on when there is a potential in circuit 99, but this should be noted with reference to FIG. This also occurs during the lag period.

In all of these conditions, transistor T95 is on, transistor T96 is off, and a pair of transistors T97 and T98 are on to light lamp 81.

Device 201 includes a number of plug and socket combinations used in the system.

If these plug-socket connections break,
A pair of transistors T97 and T98 are turned on by current flowing through resistor R155.

Device 201 includes a connection device for actually connecting the controller to the vehicle, so that if the controller is removed from the vehicle, lamp 81 will be illuminated.

Now, obviously many variations are possible in the whole mechanism.

Therefore, three actuators and four wheel sensors are provided in the preferred embodiment.

If four actuators are desired for a particular application, such an arrangement is not difficult.

Instead of two rear wheel speed sensors, it is also possible to use one rear sensor which acts on the drive of the rear wheels.

If desired, two actuators could be used, one for the rear wheels and one for the front wheels, again resulting in two wheel speed sensors or four wheel speed sensors, depending on the application. It is also possible to use a sensor.

In the case of a sensor failure circuit, it is not an absolute requirement to check the output of the frequency-to-voltage converter, although this is preferred since the activation of the frequency-to-voltage converter is automatically detected at the same time.

However, the outputs of the sensors can also be compared with each other in other ways as DC or AC circuits.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the braking mechanism according to the present invention, showing the configuration of the hydraulic system and the electrical system, Fig. 2 is a circuit diagram explaining the power supply system, and Fig. 8 is a diagram of the wheel anti-slip mechanism. A block diagram, FIG. 4 is a circuit diagram explaining the frequency-voltage converter used in this mechanism, FIG. 5 is a circuit diagram explaining the differentiating circuit and amplifier used in this mechanism,
Fig. 6 is a circuit diagram explaining the deterrent circuit used in this mechanism, Fig. 7 is a circuit diagram explaining the safety circuit used in this mechanism, and Fig. 8 is a circuit diagram explaining the failure detection circuit of the wheel speed sensor. Figure 9 is a circuit diagram explaining a rear wheel lock detection circuit, Figure 10 is a circuit diagram explaining a detection circuit used in this mechanism, and Figure 11 is a circuit diagram of a monitoring device used in this mechanism. be. In addition, in the figure, 2L22 is the front wheel, 23.24 is the rear wheel, and 21
a, 22a, 23a, 24a are brakes, 21b, 2
2b, 23b, 24b are wheel sensors, 25 is a brake pedal, 26, 27.28 is an actuator, 29 is a brake fluid tank, 31 is a pressure fluid supply path, 36, 3
7.38 is a control valve, 39.4L42 is a solenoid related to the wheel, 43 is an electronic control device, 54 is a safety circuit, 58
are timing circuits, 61.61a, 61b. 61c is a frequency-voltage converter, 62.62a. 62b, 62c are differentiating circuits, 63.63a, 63b63
c is the suppression circuit, 64.64a, 64b, 64c are the amplifiers, 65 is the sensor failure detection circuit, 66 is the rear wheel pink detection circuit, 67 is the gate circuit, 68° 69.71 is the switch circuit, 72 is the inspection It is a circuit.

Claims (1)

[Claims] 1. A braking mechanism for a road vehicle equipped with a wheel anti-slip circuit, including a sensor device that generates a signal indicating the rotational deceleration of a wheel of the vehicle, and a sensor device connected to the sensor device so that the rotational deceleration signal indicates the impending occurrence of slipping. a brake release device for energizing a solenoid forming part of a hydraulically actuated actuator to release the brake when indicating a condition; a switch device operable by said actuator when said actuator is in a rest condition; and a switch device for closing said actuator. and a test circuit operable for a certain period of time to apply a signal simulating a slipping condition to the brake release device when the brake release device is activated, and when the switch device is deactuated as a result of actuation of the actuator. The switch device is configured to be connected to the test circuit so as to immediately de-energize the solenoid and return the actuator to its resting state for a predetermined test period, and the test circuit is connected to the test circuit for immediately deenergizing the solenoid and returning the actuator to its rest state. anti-slip circuit activation means for detecting activation release and activation resumption, and preventing activation of the wheel anti-slip circuit if the activation release or activation resumption does not occur in response to the activation release and activation resumption; A braking mechanism for a road vehicle equipped with a wheel anti-slip device, characterized in that the brake mechanism is connected to a wheel.