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Braking device for vehicle

A technology for braking devices and vehicles, which is applied in the direction of braking action starting devices, brakes, vehicle components, etc., and can solve problems such as consumption, excessive reduction of hydraulic pressure, and uncoordinated braking operation feeling of the driver.

Inactive Publication Date: 2015-01-14
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, for example, if a hydraulic fluid leak occurs in the pressure boosting mechanism, there is a possibility that the hydraulic fluid pressurized by the power hydraulic source may flow back to the master cylinder side.
In addition, in the above-mentioned conventional hydraulic brake control device and brake system, if, for example, leakage of hydraulic fluid occurs in the flow path between the pressure boosting mechanism and the wheel cylinder, that is, the brake system during an abnormality, there is a Possibility of excessive reduction (consumption) of the hydraulic pressure accumulated in the power hydraulic source due to leakage of working fluid, etc.
As a result, there is a possibility of giving the driver an uncomfortable brake operation feeling.

Method used

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  • Braking device for vehicle
  • Braking device for vehicle
  • Braking device for vehicle

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Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0034] Hereinafter, a brake device for a vehicle according to an embodiment of the present invention will be described with reference to the drawings. figure 1 It is a schematic system diagram of the vehicle braking device according to the first embodiment.

[0035] The braking device of the vehicle includes a brake pedal 10, a master cylinder unit 20, a power hydraulic pressure generating device 30, a hydraulic control valve device 50, a booster mechanism 80, a booster mechanism cut-off valve 90, and a brake ECU 100 for brake control. Brake units 40FR, 40FL, 40RR, and 40RL provided on respective wheels include brake rotors 41FR, 41FL, 41RR, and 41RL and wheel cylinders 42FR, 42FL, 42RR, and 42RL built in calipers. Here, the braking unit 40 is not limited to four wheels that are disc brakes, for example, all four wheels are drum brakes, or the front wheels are disc brakes and the rear wheels are drum brakes. Any combination of movement and so on. In addition, in the followin...

no. 2 Embodiment approach

[0109] In the above-mentioned first embodiment and modified example, it is implemented in such a manner that there is a concern that the hydraulic fluid may flow back into the master cylinder 21 via the booster mechanism 80 or leakage of the hydraulic fluid may occur in the brake system communicating with the booster mechanism 80 . In such a situation, the pressure booster shut-off valve 90 is kept closed to prevent backflow of the working fluid and decrease (consumption) of the accumulator pressure Pacc accumulated in the accumulator 32 of the power hydraulic pressure generator 30 . In this case, in the brake system communicating with the booster mechanism 80 and the booster mechanism 80 , it may also be implemented to suppress the occurrence of the above-mentioned situation by continuously maintaining good sealing performance. Hereinafter, this second embodiment will be described, and the same parts as those in the above-mentioned first embodiment will be given the same refer...

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Abstract

A master cylinder (21) generates a master cylinder pressure in response to the operation of depressing a brake pedal (10) by a driver. A power hydraulic pressure generation device (30) is provided with a pressurizing pump (31) and an accumulator (32), and the pressure of a hydraulic fluid pressurized by the pressurizing pump (31) is accumulated as an accumulator pressure by the accumulator (32). A pressure increasing mechanism (80) connects to both the master cylinder (21) and the accumulator (32). The pressure increasing mechanism (80) is mechanically operated according to the master cylinder pressure supplied from the master cylinder (21) and generates a servo pressure using the accumulator pressure supplied from the accumulator (32). A pressure increasing mechanism cutoff valve (90) serving as a shutoff valve is a normally closed solenoid on-off valve and is provided in a high-pressure supply passage (15) for connecting the accumulator (32) and the pressure increasing mechanism (80). The pressure increasing mechanism cutoff valve (90) is controlled by a brake ECU (100) to a closed state in which the connection between the accumulator (32) and the pressure increasing mechanism (80) is shut off.

Description

technical field [0001] The present invention relates to a brake device for a vehicle using a power hydraulic pressure source and a master cylinder selectively as a hydraulic pressure source, and more particularly to a brake device for a vehicle having a booster mechanism connected to the power hydraulic pressure source and the master cylinder. Background technique [0002] In recent years, there has been proposed a brake device that includes a booster pump (accumulator) as a power hydraulic pressure source and a device that uses the hydraulic pressure of the booster pump (accumulator) to pressurize and output the hydraulic pressure from the master cylinder. The booster mechanism, and select the hydraulic pressure from these booster pumps (accumulators) and the hydraulic pressure from the booster mechanism for use. For example, as such a braking device, a hydraulic brake control device disclosed in Patent Document 1 below and a brake system disclosed in Patent Document 2 desc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60T8/17B60T17/18
CPCB60T8/17B60T8/885B60T13/686B60T13/146B60T17/18B60T8/4081B60T7/042B60T13/662B60T13/142B60T13/148
Inventor 宫崎彻也
Owner TOYOTA JIDOSHA KK