JPH0773993B2 - Electric command type fluid pressure brake device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a railway vehicle brake device equipped with a hysteresis correction means for correcting the hysteresis of a fluid pressure device in response to a brake command.

[0002]

2. Description of the Related Art Conventionally, a fluid pressure device used in a brake device for a railway vehicle, such as an electric-fluid pressure conversion valve or a relay valve, has a command because it has a sliding portion and a bias spring in its structure. It is known that the current and the command pressure have hysteresis characteristics such that different command pressures cause different pressures when the current and command pressures are in the rising state and the falling state, respectively.

Conventionally, there is a railway vehicle brake device provided with hysteresis correcting means for correcting this hysteresis characteristic, which is disclosed in Japanese Patent Publication No. 62-30948, which is shown in FIGS. 4 and 5. And explain.

In FIG. 4, 1 is a commander, 2 is an amplifier,
3 is an electro-pneumatic pressure conversion valve, 4 is a relay valve, 5 is a brake cylinder, 10 is a differentiation circuit, 11 is a comparison circuit, 12 is a storage device, 13 is a correction circuit, and 14 is an arithmetic circuit.

The differentiating circuit 10 is composed of an operational amplifier (not shown) having an input capacitor and a feedback resistor, receives a brake command E from the command unit 1, and outputs a positive voltage when the brake command E rises to brake. When the command E drops, a negative voltage is output, and when the brake command E becomes constant, the output is zero.

The comparison circuit 11 is a window comparator (not shown), which receives the output of the differentiating circuit 10 as an input,
When the output of the differentiating circuit 10 is zero, the voltage of the first output end C1 and the second output end C2 is zero, and when the output of the differentiating circuit 10 rises and exceeds the positive reference voltage + V, only the second output end C2 is present. When the output of the differentiating circuit 10 drops to a negative reference voltage -V or less, the positive voltage is output only to the first output terminal C1. Note that the positive and negative reference voltages + V and -V take into consideration measures against noise in the output of the differentiating circuit 10, and their absolute values are set as small as possible in terms of control accuracy.

The differentiating circuit 10 and the comparing circuit 11 constitute a judging means for judging whether the brake command E is rising, falling, or constant.

The memory circuit 12 is a JK flip-flop circuit, and the output of the first output terminal C1 of the comparison circuit 11 is input to its first input terminal J, and the second output terminal of the comparison circuit 11 is input to its second input terminal K. When the output of C2 is input and only the second output terminal C2 of the comparison circuit 11 is positive, the output of the first output terminal Q is zero,
When the output of the second output end bar Q is positive and only the first output end C1 of the comparison circuit 11 is positive, the output of the first output end Q is positive,
When the output of the second output end bar Q becomes zero and both the output ends C1 and C2 of the comparison circuit 11 become zero, both output ends Q,
Each bar Q retains its previous output state.

The storage circuit 12 constitutes a storage means for storing the rise or fall of the brake command output by the determining means.

Table 1 shows the operations of the differentiating circuit 10, the comparing circuit 11, and the memory circuit 12 in response to the brake command.

[0011]

[Table 1]

The correction circuit 13 outputs a correction value, which will be described later, based on the output of the storage circuit 12 at its first output terminal H1 and second
Output to the output terminal H2.

The arithmetic circuit 14 adds and subtracts the brake command E from the command unit 1 and the correction value from the correction circuit 13, and the result, that is, the corrected brake command E'is added to the amplifier 2
Communicate to.

FIG. 5 shows the actually measured hysteresis characteristic. In the same figure, it is assumed that the air pressure P changes to low when the brake command rises, the air pressure P changes to low when the brake command E decreases, and the hysteresis width is constant. In this hysteresis characteristic, if the lower line is set as the target air pressure for the brake command E, it is necessary to correct the brake command E only when the brake command E falls. Then, the brake command E when descending is E
If the target air pressure P is 1, the target air pressure P is P1. Therefore, the brake command E must be corrected from E1 to E2 by Ha. Here, since the hysteresis width is constant, the correction value H when the brake command E is falling is Ha (however, Ha is constant).

Therefore, in the brake device described in FIG. 4, the correction circuit 13 is configured so that the correction value H is constant, that is, the second output end H2 of the storage circuit 13 is set to zero and stored. The correction value H = Ha is output to the first output terminal H1 of the correction circuit 13 only when the first output terminal Q of the circuit 12 becomes positive or holds positive.

When the brake command E is increased in this manner, the differentiating circuit 10 outputs a positive voltage, and when the value becomes equal to or higher than the reference voltage + V, the comparing circuit 11 causes the first output terminal C1.
Is zero, the second output terminal C2 outputs a positive voltage, and it is determined that the brake command E has risen.

When the output of the comparison circuit 11 is input to the memory circuit 12, the memory circuit 12 has a first output terminal Q of zero,
The second output end bar Q outputs a positive voltage. Even if the output of the storage circuit 12 is input to the correction circuit 13, the correction circuit 13
The outputs of the output terminals H1 and H2 of are zero.

If the brake command E is made constant after being increased, the output of the differentiating circuit 10 becomes zero, the voltages of both output terminals C1 and C2 of the comparing circuit 11 become zero, and both output terminals Q of the memory circuit 12 and the bar are shown. Q retains its previous state. That is, the first output terminal Q of the storage circuit 12 holds zero and the second output terminal Q holds positive, and both output terminals H1 and H1 of the correction circuit 13 are held.
Both H2 hold zero.

Therefore, the input to the arithmetic circuit 14 is only the brake command E from the command unit 1.

When the brake command E is lowered, the differentiating circuit 10 outputs a negative voltage, and when the value becomes equal to or lower than the reference voltage -V, the comparator circuit 11 has its first output terminal C1 positive and second.
It is determined that the output terminal C2 has become zero and the brake command E has dropped.

When the output of the comparison circuit 11 is input to the storage circuit 12, the storage circuit 12 has a positive first output terminal Q,
The second output end bar Q becomes zero. When the output of the memory circuit 12 is input to the correction circuit 13, the first output terminal H1 becomes H
a, the second output terminal H2 outputs zero.

If the brake command E is made constant after it is lowered, the output of the differentiating circuit 10 becomes zero, the outputs of both output terminals C1 and C2 of the comparing circuit 11 become zero, and both output terminals Q of the memory circuit 12 and bar. Q retains its previous state, ie
The first output terminal Q of the memory circuit 12 holds positive and the second output terminal bar Q holds zero, and the first output terminal H1 of the correction circuit 13 holds H.
a, the second output terminal H2 holds zero.

Therefore, the input to the arithmetic circuit 14 is the brake command E and the correction value Ha, and the arithmetic circuit 14 subtracts the correction value Ha from the brake command E.

As described above, in the brake device described in the above publication, the predetermined correction value of the brake command is added / subtracted according to the increase or decrease of the brake command, and the brake command corrected by the addition / subtraction is fluidized. It is converted into pressure.

[0025]

By the way, in recent railway vehicles, a skid prevention device is provided in order to prevent the wheels from slipping during braking to extend the braking distance and to prevent the wheels from becoming flat. Often. As shown in FIG. 1, this anti-skid device uses the anti-skid valve 6 provided between the relay valve 4 and the brake cylinder 5 as the discharge position when the anti-skid part 7 detects that the wheel has slipped. , The fluid pressure in the brake cylinder 5 is discharged and the fluid pressure on the relay valve 4 side is shut off, and when the recovery from sliding is detected or when the wheels are re-adhered, the skid prevention valve 6 is set to the communicating position and relayed again. The valve 4 and the brake cylinder 5 are communicated with each other.

At this time, in a railway vehicle provided with a skid prevention device, there may be a case where the correspondence between the brake command and the fluid pressure of the brake cylinder 5 cannot be controlled one-to-one even by the hysteresis correction circuit.

As shown in FIG. 6, when the brake command E corrected by the hysteresis correction circuit holds a constant value E2 from the lowered state, wheel slippage occurs and the slip prevention valve 6 brakes. The fluid pressure in the cylinder 5 is discharged and the fluid pressure on the side of the relay valve 4 is shut off, and at the time when recovery from sliding is detected or when the wheels are re-adhered, the anti-skid valve 6 is activated again by the relay valve 4 and the brake cylinder 5.
, The pressure fluid in the electric-fluid pressure conversion valve 3 or the relay valve 4 flows out into the brake cylinder 5 to cause a temporary pressure drop. At that time, the electric-fluid pressure conversion valve 3 or the relay valve The pressure of 4 decreases from P1 to P1 'or P1 ". When the fluid pressure becomes P1', this P1 'is the electro-hydraulic pressure conversion valve 3 for the brake command E2 at that time.
Since the value is lower than the range of the hysteresis characteristic of the relay valve 4 or the relay valve 4, the electro-hydraulic pressure conversion valve 3 or the relay valve 4 takes the supply position, and the hysteresis of the electro-fluid pressure conversion valve 3 or the relay valve 4 causes the brake command. As a result of the increase of E, the fluid pressure with respect to the brake command E2 becomes stable at the pressure value P2. Further, when the fluid pressure becomes P1 ″, this value P1 ″ is within the hysteresis characteristics of the electric-fluid pressure conversion valve 3 and the relay valve 4 with respect to the brake command E2, and therefore the fluid pressure at that time is maintained as it is. Will be done. In this way, when the wheel slips when the brake command E reaches a constant value from the lowered state, the fluid pressure P for the brake command E at that time is controlled to a low value after the wheel slides, and the brake command E There is a problem that it is not possible to always control the correspondence between the fluid pressure in the brake cylinder 5 and the fluid pressure in the brake cylinder 5.

The present invention has been made in view of the above problems, and is input to the arithmetic circuit when the sliding recovery signal is output in a state where the brake command E holds a constant value from the constant value falling state. The purpose is to always control the correspondence between the actual brake command and the fluid pressure of the brake cylinder in a one-to-one correspondence by converting the brake command to the rising signal.

[0029]

An electric command type fluid pressure brake device according to the present invention provides a means for judging whether the brake command is rising, falling or a constant state, and a brake command rising or falling signal output by the judging means. Based on the storage means for storing and the rise or fall signal of the brake command output from this storage means and the output value of the brake command, the correction value of the brake command for the hysteresis of the fluid pressure device at that time is added to or subtracted from the brake command. In the electric command type fluid pressure brake device having a calculation means for outputting the output, the detection means for detecting that the brake command is in a constant state is provided, and the output of the detection means and the sliding detection portion are used for the wheel sliding. Recovery or re-adhesion is detected, and a logical product means for calculating a logical product with the gliding recovery signal that is output is provided. The signal from the stage, is provided with a output means for converting the correction value of the brake command to be input to said calculation means to increase the signal.

[0030]

According to the present invention, the output means for converting the brake command input to the arithmetic circuit into the rising signal when the sliding recovery signal is output when the brake command is a constant value is provided. Outputs a correction value when the brake command is in the rising state, and the fluid pressure device is controlled by the corrected brake command. As a result, the fluid pressure in the fluid pressure equipment temporarily drops due to re-supply to the brake cylinder, but the fluid pressure equipment remains in the supply position until it reaches the pressure value based on the corrected brake command. Even after the descent, the pressure value can be made the same as that before the sliding of the wheels, and the correspondence between the actual brake command and the fluid pressure of the brake cylinder can be constantly controlled one-to-one.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention. The difference from the prior art is that the output of the comparison circuit 11 detects the constant value of the brake command to generate an output signal (NOR circuit). ) 21, delay circuit 22, and this delay circuit 2
AND means 23 (AND circuit) 23 that takes the logical sum of the output of 2 and the gliding recovery signal, and the output means (diode that converts the brake command E input to the arithmetic circuit 14 by the output of the AND means 23 into a rising signal). ) 24 is the memory circuit 12
This is the point provided on the input side of.

As shown in FIG. 2, when the brake command is at a constant value E2 from the lowered state, wheel slippage occurs, and by re-supplying to the brake cylinder 5 thereafter, the electro-hydraulic pressure conversion valve 3 and the relay valve. Even if the fluid pressure in 4 drops from P2 to P1 ', the output of the comparison circuit 11 is converted into an increase signal of the brake command E by the above configuration, and E1 is output as the corrected brake command. So
The electric-fluid pressure conversion valve 3 and the relay valve 4 will be in the supply position until the pressure value P2 before sliding is reached.

A delay circuit 22 is provided in the above configuration, and the operation of the delay circuit 22 will be described below.

In FIGS. 1 and 3, the brake command is E
When decreasing from 1 to a constant value E3, the pressure fluid in the electric-fluid pressure conversion valve 3 and the relay valve 4 gradually decreases from the pressure value P2 based on the brake command. And the brake command E
When the wheel slips before the pressure value P1 corresponding to 3 and the pressure drop occurs at the time of the pressure value P2 'due to the subsequent re-supply to the brake cylinder 5, the lowered pressure value corresponds to the brake command E3. P higher than pressure value P1
It may be 1 '. At this point, the above-mentioned output means 24
When the brake command is corrected as being increased by the above, the pressure value P1 ′ falls within the range of the hysteresis characteristics of the electric-fluid pressure conversion valve 3 and the relay valve 4 at the corrected brake command E2. This value P1 'will be held.

Therefore, by providing the delay circuit 22, immediately after the brake command drops from E1 to E3, even if a gliding recovery signal is input, the signal from the output means 24 is prevented from being output for a certain period of time. The correspondence between the brake command and the brake cylinder 5 is ensured to be one-to-one.

The pressure value P1 'after the pressure drop is P
If it is lower than 1, and the increase signal of the brake command is not output due to the operation of the delay circuit 22, the brake command holds E3 at the time of the descending state,
Since the pressure value P1 'is within the range of the hysteresis characteristic of the electric-fluid pressure conversion valve 3 and the relay valve 4 at the time of the brake command E3, this value P1' is held.
Therefore, the delay time of the delay circuit 22 needs to be appropriately set in consideration of the required fluid pressure capacity of the braking device of the vehicle to which the delay circuit 22 is applied and the traveling condition.

As described above, the delay circuit 22 is appropriately set depending on the situation, and may be omitted if it is not necessary.

In the above embodiment, the constant braking command is detected regardless of whether the braking command is rising or falling. However, the braking command is constant when the braking command is falling. It is also possible to detect only. In this case, the logical product of the output of the output means 24 and the first output terminal Q of the storage circuit 12 is positive, and this logical product signal may be output to the delay circuit or the logical product means.

[0039]

According to the present invention, when the anti-skid device operates, the correction value when the brake command is in the ascending state is output, and the fluid pressure is controlled by this corrected brake command, so that the brake command is always applied. It is possible to maintain a constant braking force with respect to, and improve the braking accuracy.

[Brief description of drawings]

FIG. 1 is a block diagram of an electric command type hydraulic brake device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a hysteresis characteristic for explaining the operation of the brake device of FIG.

FIG. 3 is a diagram showing that when the brake command is corrected, the pressure value falls within the hysteresis characteristic range of the electric-fluid pressure conversion valve and the like when the brake command is corrected.

FIG. 4 is a block diagram of a conventional brake device.

FIG. 5 is a diagram showing a measured hysteresis characteristic of a conventional brake device.

FIG. 6 is a diagram showing a hysteresis characteristic for explaining a case where a correspondence between a brake command and a fluid pressure of a brake cylinder cannot be controlled in a one-to-one relationship.

[Explanation of symbols]

 7 Sliding Detecting Section 10 Differentiation Circuit (Determination Means) 11 Comparison Circuit (Determination Means) 12 Memory Circuit (Memory Means) 14 Arithmetic Circuit (Arithmetic Means) 21 Detecting Means 23 Logical AND Means 24 Output Means E Brake Command

Claims (1)

[Claims] 1. A means for determining an increase, a decrease, and a constant state of a brake command, a storage means for storing an increase or decrease signal of the brake command output by this determination means, and a brake command output from this storage means. An electric command type fluid pressure brake equipped with a calculation means for adding and subtracting a correction value of the brake command to the hysteresis of the fluid pressure device at that time to the brake command based on the up or down signal and the output value of the brake command. In the device, a detection means for detecting that the brake command is in a constant state is provided, and the output of this detection means and the sliding detection section detect a recovery of wheel sliding or readhesion and output a sliding recovery signal. A logical product means for taking a logical product with is provided, and by the signal from this logical product means, the brake command input to the arithmetic means is Electric command type hydraulic brake apparatus characterized by comprising an output means for converting the positive value increase signals.