JPS6042147A - Skid controller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a skid control device.

BACKGROUND OF THE INVENTION Conventional skid control devices include a measured value transmitter, an evaluation circuit and a brake pressure control valve which is connected in the brake line between at least one main brake cylinder and at least two wheel brake cylinders and changes the brake pressure. have.

DESCRIPTION OF THE INVENTION According to the invention, a supply valve is provided which is actuated during skid control and which, upon actuation of the brake valve, absorbs the pressure of the pressure source, preferably the pressure controlled by the brake valve (prepressure). It is designed to act on the inlet of the brake pressure control valve, so that the pressure supply is restricted.

Embodiment The brake pressure device 1 shown in FIG. 1 includes two brake circuits (1) and two main brake cylinders (2),
3 and associated pistons 4,5. A pressure chamber 6 is connected to the piston 5.
The pressure delivered from the pressure supply device 8 - the prepressure - is controlled by means of a brake valve 7 actuated by a.

This pressure acts directly on the piston 5 and indirectly on the piston column, thereby creating a brake pressure in the brake circuits I and I.

Brake pressure control valves 9.10, 11.12 in the form of two 3-point, 3-position solenoid valves are respectively connected for each brake circuit in the conduit to the wheel brake cylinders (not shown); These brake pressure control valves increase the pressure of the wheel brakes in a first position, as seen in the brake pressure control valve 12, maintain this pressure constantly in a second position, and increase this pressure in a third position. Return conduit 13
．． 14.

A supply valve 15 in the form of a 3-point, 2-position solenoid valve is connected to the pressure chamber 6. During skid control, the pressure in the pressure chamber 6 is controlled by this supply valve through a throttle 15a to the brake pressure control valve 9. It is produced at the entrance of °10, '11, and l2. The pressure action takes place via a two-part valve block 16, which includes two check valves 15a which only allow the flow of pressure medium towards the brake pressure control valves 9, 10; 11, 12. , 16b,
By these check valves both brake circuits 1, I
The valve block 16 furthermore has four check valves 17, 18 which are connected to the auxiliary connection conduit 19 to the brake pressure control valves 9, 10, 11 +-12. and brake pressure control valve 9.10 located within 20 and upon a decrease in pressure in the chamber of valve block 1G;
Allowing a pressure drop at the outlets 1, 12. In the case of normal braking, the brake pressure is generated exclusively via the main brake cylinders 2, 3. Brake pressure builds up quickly. In the case of skid control, the supply valve 15 is additionally opened to replenish the brake medium under throttling action. FIG. 2 shows the valves of one brake circuit, for example the brake pressure control valve 9,100 circuit of FIG. It shows. The brake pressure control valves 9, 10 are connected to conductors 21, 22 by means of an evaluation circuit.
and OR gates 23, 24. The brake pressure control valve builds up a pressure in the de-energized position, maintains the pressure constant in an intermediate position controlled using a suitably sensed control signal, and maintains the pressure constant in a fifth controlled position using a larger signal. position reduces pressure.

In order to avoid a simultaneous pressure build-up via both brake pressure control valves 9, 10, AND gates 25, 26 and 27 and bistable sections 4'A 28, 29, 30 are provided. 〇The pressure of both wheels is controlled and the conductors 21.22
The pressure drop signal switches the bistable switches 29 and 30, and when the input signal is introduced into the AND gate 27, the bistable switch 28 is actuated to pass the signal to the
Send to ND gates 25 and 26. While the control signal is flowing in both conductors 21 and 22 (for pressure reduction or to keep the pressure constant), the gates 25 and 26 are blocked due to the reversal of the signal. Both exits of AND gates 25,26 therefore have no signal.

A for crossed feedback conductors 31 and 32
A signal is generated at the inverted inputs of ND gates 25 and 26.

When the signal on one of the conductors 21 or 22, for example the signal on the conductor 21, disappears (thereby building up pressure via the brake pressure control valve 9), an output signal is produced in the AND gate 25 and the signal in the AND gate sends a signal to the brake pressure control valve 10 which maintains the pressure constantly at the intermediate position of the brake pressure control valve 10.

While the signal is present on conductor 22, the signal is overramped. The output signal of simultaneous KAND gate 25 interrupts AND gate 26 via feedback conductor 32. When the line 220 control signal also disappears, the brake pressure control valve 10 is maintained in an intermediate position (maintaining pressure constant) by the output signal of AND gate 25. On the other hand, due to the blocking of the AND gate 26, no signal is sent to the brake pressure control valve 9. Therefore, the pressure buildup via the brake pressure control valve 10 is prevented while the pressure buildup via the brake pressure control valve 9 is taking place. When the control signal flows through the conductor 21 again, the AND gate 25 is shut off and thus the pressure maintenance signal for the pressure control valve 10 is terminated. At the same time, the AND gate 26 is deblocked via the feedback line 32, and - if no further signal occurs on the line 22, a pressure is built up via the brake pressure control valve 10 and the brake pressure control valve 9 is A pressure hold signal is generated by AND gate 26. At the same time, AND gate 25 is blocked. The switching of the bistable elements 28, 29, 30 to the forward position takes place via the terminal 33 at the end of braking, for example by releasing the brake light circuit.

Figure 3 shows a simple arrangement of valves. Here, 3
one brake pressure control valve 40, 41, 42 and supply valve 43
is shown, and the supply valve is equipped with a throttle 43a. In this case, the outlet of the supply valve 43 is connected to a separately provided check valve 44.
and 45 via brake pressure control valve 42 or 4-
0 and 41.

Advantages of the invention By applying pressure to at least one static brake circuit using a supply valve, the pressure medium in the brake circuit can be maintained even if the pressure medium which has flowed out during skid control is not returned when the brake pressure decreases. will never be used up. Furthermore, because the configuration of the invention allows the pressure to be built up via the supply valve, the pressure control device becomes inexpensive and there is no need for a separate pinose valve to quickly build up the pressure without adjustment. is necessary.

The embodiment according to claim 2 prevents different pressures in the wheel brakes from being compensated for in the control.

Furthermore, the functional type is improved, so that the skid control function is activated at low pressure build-up rates, which places lower demands on the solenoid valve and reduces pressure fluctuations due to the opening and closing timing of the valve.

[Brief explanation of drawings]

The drawings show an embodiment of the invention, in which FIG. 1 is a circuit diagram of the skin 15 control device, FIG. 2 is a circuit diagram of a valve in one brake circuit for obtaining the desired function, and FIG.
The figure shows another structure of the valve device. ■ - Brake force booster, 2 and 3 - Main brake cylinder, 4 and 5 Piston, 6... Pressure chamber, 7...
Brake valve, 7a...Pedal, 8 Pressure supply device, 9
, 10; 11, 12, brake pressure control valve, 13 and 1
4 Return conduit, 15・Supply valve, 16・Valve blower? ,1
6a and 16b・Check valve, 17 and 18...Check valve,
19 and 20...Auxiliary connection conduit, 21 and 22...Conductor wire, 23 and 24...OR gate, 25.26 and 2
7...AND gate, 2δ, 29 and 30, member,
31 and 32... Feedback conductor, 33... Terminal, 40. 41 and 42... Brake pressure control valve, 43...
・Supply valve, 43a... throttle, 44 and 45... check valve

Claims (1)

[Scope of the Claims] - A Suginovi control device, comprising a measured value transmitter, an evaluation circuit and a braking pressure control device connected in a brake conduit between at least one main brake cylinder and at least two wheel brake cylinders; In the type having a brake pressure control valve, a supply valve (15) is provided, and this supply valve is operated during skid control, and when the brake valve is operated, the pressure of the pressure source is controlled to control the brake pressure. A kid control device which is adapted to act on the inlet of a valve and to restrict the supply of pressure. 2. The evaluation circuit includes at least one brake circuit (I, M
Brake pressure control valve (9, 10; 11.1
2) The skin 1♂ control device according to claim 1, wherein the skin 1♂ control device is configured not to simultaneously control the skin 1♂ to a position where pressure is generated during skid control. Convex, using only one supply valve (15) to supply the pressure source (
8) to the brake pressure control valves (Q, 10; 11, 12) of multiple brake circuits (■ and ■), the brake circuit is connected between the supply valve (15) and the brake circuit (■ and II). 3. The skid control device according to claim 1 or 2, wherein a valve is connected that allows only pressure formation within (■ and ■). 4. Any one of claims 1 to 3, wherein the brake pressure control valve (9, 10; 11, 12) is bridged by a valve that allows pressure to build up at the outlet of the brake pressure limitation valve. The skid control device according to item 1.