JPH0313110B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a braking device for an automobile, and more specifically, when the actual vehicle speed of an automobile, which is decelerated by the braking force of a foot brake exerted by operating a brake pedal, becomes less than a predetermined speed,
The present invention relates to a braking device for an automobile that electrically holds the braking force of the foot brake to stop the automobile, and then maintains the braking force until the accelerator pedal is operated to start the automobile. Such a braking device is convenient because it can save the trouble of frequently operating the handbrake when driving on a congested road. This method is particularly effective in automobiles equipped with automatic transmissions, called automatic automobiles, because there is a so-called creep phenomenon in which the automobile moves forward without operating the accelerator pedal. In the prior art, it is allowed to park the vehicle by the braking force of the held foot brake without operating the handbrake. Therefore, if you forget to release the braking force retention and leave it for a long time, there is a problem that the battery installed in the automobile will be consumed. An object of the present invention is to provide a braking device for an automobile that solves the above-mentioned technical problems and protects the battery. In order to solve this object, the present invention is provided with a battery, and when the actual vehicle speed of an automobile decelerated by the braking force of the foot brake exerted by operating the brake pedal becomes less than a predetermined speed, the foot brake The braking force holding means for holding the braking force of the brake is driven by the electric power from the battery and holds the braking force to stop the automobile until the next time the accelerator pedal is operated to start the automobile. A braking device for an automobile that maintains the braking force, comprising: a lock holding means that maintains at least a door close to the driver's seat in a locked state when the braking force of the foot brake is maintained; and a brake lever of a handbrake. means for releasing the locked state by the lock holding means and cutting off electric power from the battery to the braking force holding means to release the braking force by the braking force holding means when the brake is operated to exert a braking force; A braking device for an automobile, characterized in that it includes: Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a simplified plan view of an embodiment of the present invention, showing a partially cutaway cross section of a passenger vehicle 1. FIG. A vehicle body 2 of a passenger automobile 1 is provided with four doors 6 to 9 for entering seats 3 to 5 provided within the vehicle body 2. These doors 6~
9 is provided with locking means 10-13 for locking the doors 6-9. This passenger car 1
The vehicle is equipped with an automatic transmission (not shown) called an automatic transmission.
There is an accelerator pedal 15 near the driver's seat 3.
, a brake pedal 16, a shift lever 17 related to the automatic transmission, and a brake lever 19.
and a handle 20 are provided. FIG. 2 is a simplified block diagram showing the structure of a braking device for a passenger car 1 according to the present invention. In addition, in FIG. 2, lines l1 to l indicated by broken lines
6 indicates a line through which electrical signals flow, and solid lines 17 and 18 indicate lines through which mechanical signals such as hydraulic pressure and wires are transmitted. This braking device includes a foot brake 25, a hand brake 18, a control means 26, an accelerator pedal detection means 30, a brake lever detection means 31, a brake pedal detection means 32, and a vehicle speed detection means 33.
including. The foot brake 25 is for exerting braking force when decelerating or stopping the passenger car 1 while it is running.
It is driven by stepping on the brake pedal 16. This foot brake 25 includes a braking force holding means 27 for holding the braking force. This braking force holding means 27 includes, for example, a solenoid (not shown), and the solenoid is connected to the battery 3.
4 (see FIG. 3, which will be described later), the foot brake 25 is configured to maintain the braking force exerted by the foot brake 25 when it is powered and driven via the line l6. The handbrake 18 exerts a braking force to suppress rotation of the wheels (not shown) of the passenger car 1 in order to prevent the parked passenger car 1 from moving undesirably. , is driven by manual operation of the brake lever 19. The control means 26 is provided in connection with the foot brake 25, and controls the driving of the braking force holding means 27, as well as the locking means 10 for locking the door 6 provided close to the driver's seat 3. Lock holding means 2 for holding the locked state
It is operated to control the driving of 8. The accelerator pedal detection means 30 is provided in association with the accelerator pedal 15 and detects when the accelerator pedal 15 is depressed, and its detection signal is given to the control means 26 via the line l1.
The brake lever detection means 31 is provided in association with the brake lever 19, and detects when the brake lever 19 is manually operated, and its detection signal is given to the control means 26 via the line l2. The brake pedal detection means 32 is provided in relation to the brake pedal 16, and detects when the brake pedal 16 is depressed,
The detection signal is transmitted to the control means 26 via line l2.
given to. The vehicle speed detection means 33 is provided, for example, in relation to a rotating shaft of a wheel (not shown) of the passenger car 1, and outputs a pulse signal having a period corresponding to the angular velocity of the rotating shaft, and the output signal is connected to a line l4. to the control means 26 via. The control means 26 uses the signals given from the accelerator pedal detection means 30, the brake lever detection means 31, the brake pedal detection means 32, and the vehicle speed detection means 33 to control the aforementioned lock holding means 2.
8 and the braking force holding means 27, the lines l5, l
6 to supply power and control the drive. FIG. 3 is a block diagram showing a specific circuit configuration of the control means 26 shown in FIG. 2, and FIG. 4 is an electrical circuit diagram of the retrigger monostable circuit 40 shown in FIG. 3. Accelerator pedal detection means 30, brake lever detection means 31, and brake pedal detection means 3
2 is a switch that is turned on in a detection state and shut off in a non-detection state, and is connected to a battery 34 provided in the passenger car 1.
are connected to each other via line l10. The control means 26 is energized by power supplied from the battery 34 and line l10 via the ignition switch 35. Control means 2
6 is an OR gate 60, inverters 61, 62,
It includes an AND gate 63, a flip-flop 64, drive circuits 65 and 66, and a retrigger monostable circuit 40. The drive circuit 65 has a function of outputting sufficient power to drive the braking force holding means 27 to the line l6 when a high level signal is applied to its input terminal. When the drive circuit 66 is given a high level signal to its input terminal, the drive circuit 66
5, it has a function of outputting sufficient power to drive the lock holding means 28. Table 1 is a table for explaining the operation of the retrigger monostable circuit 40. The letter H shown in Table 1 represents a high level signal, the letter L represents a low level signal, and the letter X represents a high or low level signal.

[Table] With reference to this Table 1 and FIG. 4, the retrigger monostable circuit 40 is
, an input terminal I, and an output terminal O. A signal from the brake lever detection means 32 is applied to the reset input terminal R via a line 13 and an inverter 61, as will be described later. When the signal applied to the reset output terminal R is at a high level, this high level signal is applied to the base of the transistor Tr1 via the voltage dividing resistor R1, so that the collector and emitter of the transistor Tr1 are brought into conduction. . Note that a pull-down resistor R2 is provided between the voltage dividing resistor R1 and the base of the transistor Tr1. A line l15 connected between the collector of the transistor Tr1 and the non-inverting input terminal of the comparator 70
is connected to the power supply terminal via a voltage dividing resistor R3. When transistor Tr1 is conductive, the voltage level of the signal delivered to line l15 is low, and therefore the signal applied to the non-inverting input terminal of comparator 70 is low. Therefore, the voltage level of the signal applied to the non-inverting input terminal of the comparator 70 is determined by the voltage dividing resistor R4,
The voltage level of the signal divided by R5 and applied from the power supply terminal to the inverting input terminal is lower than that of the signal output from the output terminal of the comparator 70, that is, the output terminal O of the retrigger monostable circuit 40. It is low level. In this way, when a high level signal is applied to the reset output terminal R, the retrigger monostable circuit 40 is activated regardless of whether the signal applied to the input terminal I is high level or low level.
The signal output from the output terminal O of is at low level. A pulse signal from the vehicle speed detection means 33 is applied to the input terminal I of the retrigger monostable circuit 40 via a line l4, as will be described later. Input terminal I
The signal given to is given to the monostable circuit 71 provided in the retrigger monostable circuit 40. The signal given to the input terminal I from the vehicle speed detection means 33 is
As mentioned above, the pulse signal has a period corresponding to the vehicle speed of the passenger car 1, and the monostable circuit 62 outputs a pulse signal corresponding to the period in response to the rise of the pulse signal. monostable circuit 7
The signal output from the transistor Tr2 is applied to the base of the transistor Tr2 via the voltage dividing resistor R6. A pull-down resistor R7 is provided between the resistor R6 and the base of the transistor Tr2. Collector of transistor Tr2 and line l15
and are connected by line l16. The transistor is connected from the monostable circuit 71 via the voltage dividing resistor R6.
When the signal applied to the base of Tr2 is high level, the collector of transistor Tr2
A conductive state is established between the emitters. In this manner, when the transistor Tr2 is conductive, the voltage level of the signal applied to the non-inverting input terminal of the comparator 70 is low level. Therefore, comparator 7
0, that is, the signal output from the output terminal O of the retrigger monostable circuit 40 is at a low level. Monostable circuit 71 at the base of transistor Tr2
When the signal applied from the transistor Tr2 through the voltage dividing resistor R6 is at a low level, the transistor Tr2 is cut off. At this time, when the transistor Tr1 is cut off, that is, when the signal applied to the input terminal R of the retrigger monostable circuit 40 is at a low level, the capacitor 72 connected to the line l15
is charged by the power supplied from the power supply terminal via the voltage dividing resistor R3. When capacitor 72 is charged in this manner and the voltage level of the signal derived on line l15 is greater than the voltage level of the signal applied to the inverting input terminal of comparator 70, the output terminal of comparator 70, i.e. The signal output from the output terminal O of the trigger monostable circuit 40 becomes high level. In this way capacitor 7
2 is charged and the voltage level of the signal applied to the non-inverting input terminal of the comparator 61 becomes higher than the voltage level of the signal applied to the inverting input terminal of the comparator 70. , R5 and the capacitance of the capacitor 63, for example, 1 second. Therefore, as mentioned above, the retrigger monostable circuit 4
When the signal applied to the reset input terminal R of 0 is at low level, that is, the transistor Tr1
Retrigger monostable circuit 4 when is in cut-off state
The period W of the pulse signal given to the input terminal I of 0
1 is shorter than said time t, the comparator 70
The signal output from the output terminal O of the retrigger monostable circuit 40 remains at a low level. Also, as mentioned above, the retrigger monostable circuit 4
When the signal applied to the reset input terminal R of 0 is at a low level, and the period W2 of the pulse signal applied to the input terminal I of the retrigger monostable circuit 40 is longer than the time t, the output terminal of the comparator 70 That is, the signal output from the output terminal O of the retrigger monostable circuit 40 has a waveform as shown in the third row in Table 1, that is, as shown in FIG. 6, and a high level appears. According to the present invention, the vehicle speed detecting means 33 is configured such that the period of the pulse signal from the vehicle speed detecting means 33 becomes the time t when the actual vehicle speed of the passenger car 1 is, for example, about 1.4 km/h. . Therefore, when the signal applied to the reset input terminal R of the retrigger monostable circuit 40 is at a high level, the period of the pulse signal applied to the input terminal I of the retrigger monostable circuit 40 is less than the time t, that is, when the passenger car When the actual vehicle speed of 1 exceeds 1.4 km/h, a low level signal is output from the output terminal O of the retrigger monostable circuit 40. Further, when the signal applied to the reset input terminal R of the retrigger monostable circuit 40 is at a high level, and the period of the pulse signal applied to the input terminal I of the retrigger monostable circuit 40 exceeds the time t, that is, when the passenger car When the actual vehicle speed of 1 is less than 1.4km/h,
A high level signal is output from the output terminal O of the retrigger monostable circuit 40. A signal waveform having a period W1 shown in Table 1 represents a waveform of a pulse signal whose period is less than the time t, and a signal waveform having a period W2 represents a waveform of a pulse signal whose period exceeds the time t. Hereinafter, with reference to FIG. 3 again, the operation of the control means 26 corresponding to each driving state of the passenger car 1: (A) running, (B) deceleration, (C) stopping, (D) starting, and (E) parking. I will explain about it. (A) Driving When the passenger car 1 is traveling, the accelerator pedal 15 is always operated with the foot.
As a result, the accelerator pedal detection means 30 is always electrically connected. Therefore, a high level signal is derived from the line l1, and the OR gate 60 is routed through this high level signal line l1.
is applied to one input terminal of Due to this
The signal output from the OR gate 60 is at a high level, and this high level signal is on line l1.
1 to the reset input terminal R of the flip-flop 64. Therefore, the flip-flop 64 is reset and a low level signal is output from the set output terminal Q of the flip-flop 64. This low level signal is applied to each input terminal of drive circuits 65 and 66 via line l12. Therefore lines l5, l6
During this period, no power is output for driving the braking force holding means 27 and the lock holding means 28.
Therefore, while the passenger car 1 is running as described above, the braking force holding means 27 and the lock holding means 28 are not driven. While driving, the vehicle speed pulse frequency is high even if the accelerator is not pressed, so it is not held. (B) Deceleration When the brake pedal 16 is depressed to decelerate the passenger car 1, the foot brake 25 is driven to exert a braking force, and the passenger car 1 is decelerated accordingly. At this time, the brake pedal detection means 32 detects that the brake pedal 16 has been operated and is made conductive, and the line l
3, a high level signal is derived. This high level signal is applied to the inverter 61 in the control means 26. At this time, inverter 6
The signal output from 1 is low level,
This low level signal retrigger the monostable circuit 4
0 reset input terminal R. When the passenger car 1 is decelerated in this way,
When the speed is greater than the speed sufficient for the passenger car 1 to stop, that is, the aforementioned 1.4 km/h, the output terminal O of the retrigger monostable circuit 40
Even if the signal applied to the reset input terminal R of the retrigger monostable circuit 40 is at a low level, a low level signal is output from the circuit. This low level signal is applied to one input terminal of AND gate 63 via line l17. Therefore, the signal output from the AND gate 63 is at a low level, and this low level signal is applied to the set input terminal S of the flip-flop 64. Therefore, the flip-flop 64 remains reset without being set, and the signal output from the set output terminal Q remains at a low level. Therefore, the holding means 27 and 28 are not driven as explained in the section (A) Traveling above. In this way, when the passenger car 1 is simply decelerated, that is, when it is not decelerated to stop, the holding means 27, 28 are not driven, and the braking force exerted by the foot brake 25 is undesirably held. Never. (C) Stop When the brake pedal 16 is depressed to stop the passenger car 1, the above-mentioned
(B) Foot brake 2 as explained in the deceleration column.
5 of the braking force is exerted, and the high level signal output from the brake pedal detection means 32 is made low level by the inverter 61 and applied to the reset input terminal R of the retrigger monostable circuit 40. When the passenger car 1 is decelerated to a speed sufficient to stop, that is, to a speed below the aforementioned 1.4 km/h, a high level signal is output from the output terminal O of the retrigger monostable circuit 40. This high level signal is applied to one input terminal of AND gate 63 via line l17. When the passenger car 1 is stopped in this way, the accelerator pedal 15 and the brake lever 19 are not operated, so the accelerator pedal detection means 30 and the brake lever detection means 31 are in a disconnected state. Therefore, the signals applied to each input terminal of the OR gate 60 via the lines l1 and l2 are at low level.
The signal output from OR gate 60 is at low level. This low level signal is on line l1
1 to an inverter 62, and a high level signal is output from the inverter 62. This high level signal is the AND gate 6
3 to the other input terminal. Therefore
A high level signal is output from the AND gate 63, and this high level signal is applied to the set input terminal S of the flip-flop 64. Therefore, the flip-flop 64 is set,
A high level signal is output from the set output terminal Q. This high level signal is on line l1
2 and 113 to each input terminal of the drive circuits 65 and 66. Therefore, the braking force holding means 27 and the lock holding means 28 are
6 and 15, respectively. Therefore, the braking force of the foot brake 25 is maintained and the passenger car 1 is stopped, and
The locked state of the locking means 10 is maintained. Here, even if the driver opens the door 6 and tries to get out of the vehicle, the door 6 remains locked by the locking means 10, and the brake lever 19 is locked as will be explained in the section (E) Parking below. The driver is prevented from leaving the vehicle except when being operated. (D) Starting When the passenger car 1 is started from the state described in the column (C) Stop, the accelerator pedal 15 is operated by foot. The operation of the control means 26 at this time is the same as in the above-mentioned (A) traveling, and
Braking force holding means 27 and lock holding means 28
is not driven. Therefore, the state in which the braking force of the foot brake 25 is maintained is released,
The passenger car 1 is allowed to start. (E) Parking When the brake lever 19 is operated to park the passenger car 1, the handbrake 18
is driven, a braking force is exerted, and rotation of the wheels (not shown) of the passenger car 1 is accordingly suppressed. At this time, the brake lever detection means 3
1 is made conductive when it detects that the brake lever 19 has been operated, and a high level signal is derived to the line l2, and this high level signal is sent to the other input terminal of the OR gate 60 via the line l2. Given. By this, OR gate 6
The signal output from 0 becomes high level, and this high level signal is applied to the reset input terminal R of flip-flop 64 via line l11. Therefore, the flip-flop 64 is reset, and accordingly, the braking force holding means 27 and the lock holding means 28 are not driven as explained in the section (A) Traveling above. Therefore, the locked state of the locking means 10 of the door 6 is not maintained, and the driver is allowed to exit the vehicle. As described above, according to the present invention, when parking a car, the driver is not allowed to get out of the car unless he operates the brake lever to exert the braking force of the handbrake. It is possible to prevent the battery from being exhausted during parking as described in connection with the above.

[Brief explanation of the drawing]

FIG. 1 is a simplified plan view of an embodiment of the present invention, FIG. 2 is a simplified block diagram showing the configuration of a braking device according to the present invention, and FIG. 3 is a concrete diagram of the control means 26 shown in FIG. A block diagram showing the circuit configuration,
FIG. 4 is an electric circuit diagram of the retrigger monostable circuit 40 shown in FIG. 3, and FIGS. 5 and 6 are waveform diagrams for explaining the operation of the retrigger monostable circuit 40. 1...Passenger car, 2...Vehicle body, 3-5...Seats, 6-9...Doors, 10-13...Lock means, 15...Accelerator pedal, 16...Brake pedal, 18...Handbrake , 19... Brake lever, 25... Foot brake, 26...
Control means, 27... Braking force holding means, 28... Lock holding means, 30... Accelerator pedal detection means, 31... Brake lever detection means, 32...
Brake pedal detection means, 33...vehicle speed detection means.

Claims (1)

[Scope of Claims] 1. When the actual vehicle speed of an automobile that is equipped with a battery and is decelerated by the braking force of the foot brake exerted by operating the brake pedal becomes less than a predetermined speed, the foot brake is The braking force holding means that holds the power is driven by the electric power from the battery to hold the braking force to stop the vehicle, and then maintains the braking force until the accelerator pedal is operated to start the vehicle. A braking system for an automobile that maintains the braking force of the foot brake, the lock holding means for keeping at least a door close to the driver's seat in a locked state when the braking force of the foot brake is maintained; and a brake lever of the hand brake that maintains the braking force. means for releasing the locked state by the lock holding means and cutting off electric power from the battery to the braking force holding means to release the braking force by the braking force holding means when the brake is operated to exert the brake force. An automobile braking device characterized by: