JPH06183334A - Automotive hydraulic pressure accumulator - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the pressure load acting on the piping from the accumulator to the hydraulic actuator. An accumulator 12 that stores pressure oil supplied to a hydraulic actuator 11 mounted on a vehicle, a hydraulic pump 14 that pressure-feeds the pressure oil to the accumulator 12, and a pressure sensor 15 that detects the hydraulic pressure in the accumulator 12.
In a vehicle-mounted hydraulic pressure accumulator equipped with a control device 20 for controlling driving / stopping of the hydraulic pump 14 based on a signal from the pressure sensor 15, a vehicle speed sensor 16 for detecting the speed of the vehicle is provided and the control device 20 is provided. The setting means 21a for setting the pump drive start set pressure and the pump drive stop set pressure according to the vehicle speed is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle-mounted hydraulic pressure accumulator for accumulating a predetermined amount of pressure oil that is appropriately used in a hydraulic actuator (for example, a hydraulic booster attached to a brake master cylinder) mounted on a vehicle. Regarding

[0002]

2. Description of the Related Art An on-vehicle hydraulic pressure accumulator is disclosed in, for example, Japanese Patent Laid-Open No.
As shown in Japanese Patent Publication No. 3-17163, an accumulator that stores pressure oil supplied to a hydraulic actuator (hydraulic booster) mounted on a vehicle, a hydraulic pump that pressure-feeds the pressure oil to the accumulator, and a hydraulic pump are not shown. Is composed of a pressure sensor that detects the hydraulic pressure in the accumulator, and a control device that controls the drive / stop of the hydraulic pump based on the signal from the pressure sensor.

[0003]

By the way, in the conventional hydraulic pressure accumulator for vehicle, the pump drive start set pressure and the pump drive stop set pressure are determined in consideration of the oil pressure required at high vehicle speed, and the pressure sensor When the hydraulic pressure in the accumulator detected in step 1 is reduced to the pump drive start set pressure, the hydraulic pump drive is started and pressure oil accumulation starts.
Further, when the hydraulic pressure in the accumulator rises to the pump drive stop set pressure, the drive of the hydraulic pump is stopped and the pressure oil accumulation is stopped. Therefore, although the hydraulic pressure required at low vehicle speed is lower than that required at high vehicle speed, the high hydraulic pressure required at high vehicle speed is always accumulated in the accumulator, and the accumulator transfers hydraulic pressure to the hydraulic actuator. A high-voltage load always acts on the pipes that reach it. The present invention has been made to address the above-mentioned problems, and an object thereof is to reduce the pressure load that acts on the piping from the accumulator to the hydraulic actuator.

[0004]

In order to achieve the above object, according to the present invention, an accumulator for storing pressure oil supplied to a hydraulic actuator mounted on a vehicle, and a hydraulic pressure for feeding the pressure oil to the accumulator. A vehicle-mounted hydraulic pressure accumulator including a pump, a pressure sensor that detects the hydraulic pressure in the accumulator, and a control device that controls the drive / stop of the hydraulic pump based on a signal from the pressure sensor. In addition to providing a vehicle speed sensor for detecting, the control device is provided with setting means for setting the pump drive start set pressure and the pump drive stop set pressure according to the vehicle speed.

[0005]

In the in-vehicle hydraulic pressure accumulator according to the present invention, the pump drive start set pressure and the pump drive stop set pressure can be set according to the vehicle speed, and the pump drive start set pressure at a low vehicle speed can be set. And the pump drive stop set pressure can be made lower than the pump drive start set pressure and the pump drive stop set pressure at high vehicle speeds, and the level of the hydraulic pressure range accumulated in the accumulator is lowered as the vehicle speed decreases. be able to. Therefore, when the vehicle speed is low, the hydraulic pressure stored in the accumulator can be made lower than that at the high vehicle speed, and the pressure load acting on the pipe from the accumulator to the hydraulic actuator can be reduced, and the durability of the pipe can be improved. You can

[0006]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows a hydraulic pressure accumulator according to the present invention. This hydraulic pressure accumulator supplies pressure oil supplied to a known hydraulic booster (details not shown) 11 attached to a brake master cylinder of a vehicle. Accumulator 12 for storing, electric hydraulic pump 14 for sending pressure oil sucked from reservoir 13 to accumulator 12, pressure sensor 15 for detecting oil pressure P in accumulator 12, and vehicle speed sensor 16 for detecting the speed of the vehicle. And a control device 2 for electrically controlling driving / stopping of the hydraulic pump 14 based on detection signals from the pressure sensor 15 and the vehicle speed sensor 16.
0, a gas-filled type is used as the accumulator 12, and a predetermined amount of pressure oil is accumulated in advance.

The controller 20 is the microcomputer 2
1 and a drive circuit 22. The microcomputer 21 includes a CPU, ROM, RAM, I / O,
A timer, etc., executes a program corresponding to the flowchart of FIG. 2 stored in the ROM until the ignition switch IG of the vehicle is turned on and off, and is detected by the vehicle speed sensor 16. Setting means 21a for setting the pump drive start set pressure PON and the pump drive stop set pressure POFF according to the vehicle speed, and the pump drive start set pressure PON set by the set means 21a.
And a comparison means 21b for comparing the pump drive stop set pressure POFF with the in-accumulator hydraulic pressure P detected by the pressure sensor 15. The drive circuit 22 turns on the drive of the hydraulic pump 14 in response to a control signal (pump ON signal or pump OFF signal) from the microcomputer 21.
The OFF control is performed. When the pump ON signal is received, the hydraulic pump 14 is driven, and when the pump OFF signal is received, the hydraulic pump 14 is stopped.

Next, the operation of this embodiment constructed as described above will be described with reference to the flow chart of FIG. When the ignition switch IG is turned on, the microcomputer 21 starts execution of the program in step 100 of FIG. 2, initialization required for execution of the program is executed in step 101, and the microcomputer 21 responds to the hydraulic pressure in the accumulator 12. Then, the processes of steps 102 to 113 are performed, and the drive of the hydraulic pump 14 is turned ON / OFF as described in detail below.
F control.

At step 102, it is judged whether the vehicle speed V is equal to or higher than the set value V1, and if "NO" is judged, the routine proceeds to step 103 where the processes of steps 103 to 107 are carried out and "YES" is judged. For example, the process proceeds to step 109 and the processes of steps 109 to 113 are performed. Then, in step 103, the pump drive start set pressure is set to PL1 and the pump drive stop set pressure is set to PL2, and in step 104 it is determined whether or not the accumulator hydraulic pressure P is equal to or lower than the pump drive start set pressure PL1. , "N
If it is determined to be “O”, the process jumps to step 107 and “Y
If “ES” is determined, the process proceeds to step 105 and pump O
After outputting the N signal to the drive circuit 22, the process proceeds to step 106. At step 106, it is judged if the hydraulic pressure P in the accumulator is equal to or higher than the pump drive stop set pressure PL2.
If it is determined to be "O," step 106 is repeated, and "YE
If “S” is determined, the process proceeds to step 107 and the pump OF
After outputting the F signal to the drive circuit 22, the process proceeds to step 108.

On the other hand, in step 109, the pump drive start set pressure is set to PH1 (PH1> PL1) and the pump drive stop set pressure is set to PH2 (PH2> PL2). In step 110, the accumulator hydraulic pressure P is set. It is determined whether or not the drive start set pressure PH1 or less, and if "NO" is determined, the process jumps to step 113, and if "YES" is determined, the process proceeds to step 111 to output a pump ON signal to the drive circuit 22. After that, the process proceeds to step 112. In step 112, it is determined whether or not the accumulator hydraulic pressure P is equal to or higher than the pump drive stop set pressure PH2, and if "NO" is determined, step 112 is repeated. If "YES" is determined, the process proceeds to step 113 to turn off the pump. After outputting the signal to the drive circuit 22, the process proceeds to step 108. In addition,
At step 108, the ignition switch IG is turned on.
If it is determined to be "NO", step 1 is performed.
The program proceeds to step 14 to end the execution of the program, and if "YES" is determined, the process returns to step 102 to repeatedly execute the above-mentioned steps 102 to 113.

Therefore, in this embodiment, if the vehicle speed V is equal to or higher than the set value V1, the accumulator hydraulic pressure P is maintained in the range of PH1 to PH2, as shown in FIG. If the vehicle speed V is less than the set value V1, FIG.
As shown in (B), the accumulator hydraulic pressure P is maintained in the range of PL1 to PL2. Therefore, when the vehicle speed is low, the hydraulic pressure accumulated in the accumulator 12 can be made lower than at the high vehicle speed, and the pressure load acting on the pipe 17 from the accumulator 12 to the hydraulic actuator 11 can be reduced, and the durability of the pipe 17 can be reduced. It is possible to improve the sex.

In the above embodiment, the vehicle speed V is the set value V.
When it is 1 or more, the pump drive start set pressure is set to PH1 and the pump drive stop set pressure is set to PH2. When the vehicle speed V is less than the set value V1, the pump drive start set pressure is set to PL1 and the pump is set. Drive stop set pressure is PL2
As shown in FIG. 3A, depending on the vehicle speed,
The two modes (hydraulic pressure range) shown in (B) are obtained, but the pump drive start set pressure and the pump drive stop set pressure are set in three or more subdivisions according to the vehicle speed. It is also possible to implement so that three or more modes can be obtained according to the vehicle speed.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a hydraulic pressure accumulator according to the present invention.

FIG. 2 is a flowchart showing an example of a program executed by the microcomputer of FIG.

FIG. 3 is a diagram showing a range of hydraulic pressure in an accumulator when a hydraulic pump is controlled based on the flowchart of FIG.

[Explanation of symbols]

11 ... Hydraulic actuator, 12 ... Accumulator, 1
3 ... Reservoir, 14 ... Hydraulic pump, 15 ... Pressure sensor,
16 ... Vehicle speed sensor, 17 ... Piping, 20 ... Control device, 21
... microcomputer, 21a ... setting means, 22 ... driving circuit.

Claims (1)

[Claims] 1. An accumulator for storing pressure oil supplied to a hydraulic actuator mounted on a vehicle, a hydraulic pump for sending pressure oil to the accumulator, a pressure sensor for detecting oil pressure in the accumulator, and the pressure sensor. In a vehicle-mounted hydraulic pressure accumulator equipped with a control device that controls the drive / stop of the hydraulic pump based on a signal from the vehicle, a vehicle speed sensor that detects the speed of the vehicle is provided, and the pump is provided to the control device according to the vehicle speed. An in-vehicle hydraulic pressure accumulator, comprising setting means for setting a drive start set pressure and a pump drive stop set pressure.