JPH0139059B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The object of the present invention is to easily automate the performance characteristics of a brake system, particularly a regulator used to generate a predetermined brake pressure in the brake system.

Conventionally used fluid delivery devices for this type of experimental brake equipment include a solenoid valve and a regulator on the input side of an air chamber, and a master cylinder on the output side, which is operated by the operation of the air chamber. A series of brake fluid pressure generation/transmission mechanisms that transmit the fluid pressure generated in the master cylinder to the brake equipment, and the amount of fluid sent is calculated by detecting the piston stroke (travel amount) of the master cylinder with a dial gauge, etc. A system is being considered that includes a measuring mechanism for

This is because measuring the amount of brake fluid sent using an existing flow meter is difficult because the amount of delivered brake fluid is minute.
In addition, it is practically impossible to measure the amount of liquid returned when the brake is released by introducing it into a measuring cylinder type pipe with an extremely small diameter. The above-mentioned method is considered to be advantageous because it has disadvantages such as errors caused by adhesion to the surface and the complexity of cleaning each time.

However, this type of measurement requires repeating the brake fluid pressure in stages of about 10 kg/cm ² more than ten times, and the measurement must be carried out while considering and checking the state of air leakage in the brake fluid system. As this requires a considerable number of measurements, the amount of brake fluid supplied also changes depending on the pressurization speed due to problems such as deformation of the seal member in the brake device, so it must be measured manually each time. After setting the air pressure of the regulator, it is necessary to pressurize according to the pedal depression speed assuming normal brake operation.
The measurement problems have not yet been fully resolved.

From this point of view, the present invention was made with the aim of making it possible to automatically set the air pressure of the regulator. However, when this is done using a so-called servo valve, it is difficult to set the air pressure of the regulator. If the atmosphere is not kept in a good condition, the operation of the servovalve, which is prone to failure due to dust etc., will be hindered, and there are also disadvantages in that it is expensive.
Therefore, in the present invention, instead of using such a servo valve, the set pressure adjustment handle of the manual regulator is rotated forward or reverse by a motor by detecting the error between the set value and the actual cylinder hydraulic pressure value. A simple automatic regulator has been developed, specifically an air chamber that generates hydraulic pressure in the master cylinder by operation corresponding to the air pressure input through the regulator,
A servo motor that rotates the pressure adjustment handle of the regulator in forward and reverse directions, a control circuit that controls the servo motor, and a pressure switch that detects the hydraulic pressure generated by the master cylinder, the control circuit comprising: The input pressure to the air chamber is adjusted by rotating the servo motor in the forward or reverse direction so that the difference between the voltage value V corresponding to the set pressure and the voltage value corresponding to the detected pressure by the pressure switch is within the range of ±△V. This is a liquid feeding device for a brake device characterized by being configured as follows.

The present invention will be explained below based on the drawings.

FIG. 1 shows a schematic diagram of a brake device performance characteristics testing device to which the present invention is applied, in which 1 is a manual regulator, 2 is a solenoid valve, 3 is an air chamber, 4 is a master cylinder, 5 is a hydraulic pressure transmission pipe, 6 is a brake device, 7 is a master cylinder piston stroke detector, 8 is a pressure switch that detects the hydraulic pressure generated in the master cylinder 4, and 9 is a control that compares the set pressure with the feedback signal from the pressure switch 8. The circuit 10 is a servo motor that rotates the pressure adjustment handle of the manual regulator 1 in the forward direction (pressure increase) or in the reverse direction (pressure decrease).

FIG. 2 shows that by comparing the signal from the pressure setting circuit including the variable resistor 13 and the feedback signal from the pressure switch 8 using the comparators 11 and 12, a voltage value corresponding to the set pressure, for example, is determined. The comparator 11 detects V+ΔV and turns on the relay R _yu with respect to V, and the comparator 12 detects V−ΔV and turns on the relay R _yL .

Figure 3 shows the on state of relays R _yu and R _yL in Figure 2;
This shows a control circuit that rotates the servo motor 10 forward or reverse depending on whether the relay R _yu is turned on, the servo motor 10 is rotated forward or
The servo motor 10 is configured to be reversed when R _yL is turned on.

In this example, as shown in the figure, lamps for detecting the operation of the circuit are provided with different colors.

According to the above configuration, the manual regulator 1 is automatically maintained within the range of ±△V of the actual hydraulic pressure, and the automated mechanism for this has an extremely simple configuration. It has the advantage that it can be constructed at low cost without the problems described above when using existing servo valves, etc., and its usefulness has been extremely great.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a device for measuring the amount of fluid sent to a brake device to which the present invention is applied, and FIGS. 2 and 3 show an embodiment of a specific circuit for controlling a servo motor. 1...Manual regulator, 2...Solenoid valve, 3
...Air chamber, 4...Master cylinder, 5...
... Hydraulic pressure transmission pipe, 6 ... Brake device, 7 ... Piston stroke detector, 8 ... Pressure switch, 9 ... Control circuit, 10 ... Servo motor, 1
1, 12... Comparator, 13... Variable resistor.

Claims (1)

[Claims] 1: an air chamber that generates hydraulic pressure in a master cylinder by an operation corresponding to air pressure input through a regulator; a servo motor that rotates a pressure adjustment handle of the regulator in forward and reverse directions;
The control circuit includes a control circuit that controls the servo motor and a pressure switch that detects the hydraulic pressure generated in the master cylinder. A liquid feeding device for a brake device, characterized in that the input pressure to the air chamber is adjusted by rotating a servo motor in the forward or reverse direction so that the difference in voltage value corresponding to the voltage is within the range of ±ΔV.