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Brake system

A brake system and brake cylinder technology, applied in the direction of brake control systems, brakes, brake components, etc.

Active Publication Date: 2015-04-29
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when high-pressure hydraulic fluid can be supplied from the accumulator, a hydraulic pressure higher than the hydraulic pressure of the master cylinder can be generated, but if the hydraulic pressure of the accumulator becomes lower, the output hydraulic pressure of the booster mechanism will also decrease

Method used

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  • Brake system
  • Brake system
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0152] The hydraulic brake system involved in Embodiment 1 includes figure 2 brake circuit shown.

[0153] Reference numeral 60 is a brake pedal serving as a brake operating member, and reference numeral 62 is a master cylinder serving as a manual hydraulic pressure source that generates hydraulic pressure when the brake pedal 60 is operated. Reference numeral 64 is a power hydraulic source including a pump device 65 and an accumulator 66 . The hydraulic brakes 40, 50 are operated by the hydraulic pressure of the brake cylinders 42, 52 to restrain the rotation of the wheels, which in this embodiment are disc brakes.

[0154] The hydraulic brakes 40, 50 may be drum brakes. In addition, the hydraulic brakes 40 of the front wheels 2 and 4 may be disc brakes, and the hydraulic brakes 50 of the rear wheels 46 and 48 may be drum brakes.

[0155] The master cylinder 62 is a tandem hydraulic cylinder including two pressurizing pistons 68 , 69 , and the respective fronts of the pre...

Embodiment 2

[0263] Figure 9 The brake circuit of the hydraulic brake system of Embodiment 2 is shown. Components that are the same as those of the brake circuit in Embodiment 1 are denoted by the same symbols and descriptions thereof are omitted. In addition, the control and the like performed by the brake ECU 56 are the same as those in Embodiment 1.

[0264] In Embodiment 2, the common passage 310 is connected to the brake cylinders 52RL, RR of the left and right rear wheels 46, 48 via a single passage 312 . The hydraulic pressures of the brake cylinders 52RL, RR of the left and right rear wheels 46, 48 are commonly controlled. Also, a common holding valve 314 is provided in the individual passages 312 . The holding valve 314 is a normally closed electromagnetic on-off valve. In addition, a brake cylinder side check valve 316 is provided in parallel with the holding valve 314 , and the brake cylinder side check valve 316 allows hydraulic fluid to flow from the brake cylinders 52RL,...

Embodiment 3

[0288] In the hydraulic brake system of Embodiment 2, when the possibility of fluid leakage is detected, set Figure 12 states shown, but not limited to.

[0289] Next, control of the left and right shutoff valves 332 and the front and rear shutoff valves 330 when a possibility of fluid leakage is detected in the brake system including the hydraulic brake circuit described in the second embodiment will be described.

[0290] When the possibility of liquid leakage is detected, it is desirable to keep the left and right shutoff valves 332 and the front and rear shutoff valves 330 in the closed state as much as possible. Even if the possibility of fluid leakage is detected, it may not necessarily be that there is actually a fluid leakage, but if there is an actual fluid leakage, it is desirable to prevent the influence of the fluid leakage from affecting other brake lines. However, the left and right shutoff valves 332 and the front and rear shutoff valves 330 are electromagneti...

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Abstract

Improving a brake system. In case of failure of an electric system, a pressure increasing mechanism 100 is activated by hydraulic pressure of a master cylinder 62 whereby a servo pressure is supplied to brake cylinders 42FL, 52RR provided for a front left wheel 2 and a rear right wheel 48 while the hydraulic pressure of the master cylinder 62 is supplied to a brake cylinder 42FR provided for a front right wheel 4. Consequently, it is possible to restrain shortage of a braking force and to retrain a yaw moment. In case of presence of possibility of fluid leakage, hydraulic pressure of a power hydraulic pressure source 64 is controlled and supplied to the brake cylinders 52 provided for the rear left and right wheels 46, 48 while the hydraulic pressure of the master cylinder 62 is supplied to the brake cylinders 42 provided for the front left and right wheels 2, 4. Further, the brake cylinders 42FL, 42FR provided for the front left and right wheels 2, 4 are isolated from each other, and are isolated from the brake cylinders 52RL, 52RR provided for the rear left and right and left wheels 46, 48. Thus, three brake lines can be isolated from one another so that even if one of the three brake lines suffers from the fluid leakage, the other brake lines are not influenced by the fluid leakage taking place in the one of the three brake lines.

Description

technical field [0001] The present invention relates to a braking system including hydraulic brakes for inhibiting wheel rotation. Background technique [0002] Patent Document 1 describes a braking system comprising: (a) a hydraulic brake that suppresses wheel rotation; (b) a master cylinder; (c) an accumulator; (e) a selector valve that selects a higher one of the hydraulic pressure of the boosting mechanism and the hydraulic pressure of the master cylinder and supplies it to a brake cylinder of the hydraulic brake. [0003] The booster operates through the electric actuator when the electric actuator is normal, and operates through the hydraulic pressure of the master cylinder under abnormal conditions. In addition, when high-pressure hydraulic fluid can be supplied from the accumulator, a hydraulic pressure higher than the hydraulic pressure of the master cylinder can be generated, but if the hydraulic pressure of the accumulator is lowered, the output hydraulic pressur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60T8/17B60T8/48B60T8/88B60T13/12
CPCB60T8/885B60T8/4081B60T8/94B60T13/165B60T13/168B60T2270/402
Inventor 宫崎彻也山本贵之
Owner TOYOTA JIDOSHA KK
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