A vehicle brake device is provided with a master piston which is driven to generate a master cylinder pressure. The device includes a pressure accumulation portion that accumulates the brake fluid under pressure; a servo pressure generation portion that is configured to be able to generate the servo
A vehicle brake device is provided with a master piston which is driven to generate a master cylinder pressure. The device includes a pressure accumulation portion that accumulates the brake fluid under pressure; a servo pressure generation portion that is configured to be able to generate the servo pressure using the brake fluid in the pressure accumulation portion regardless of the operation of the brake operation member; brake fluid consumption correlative value detection means for detecting a brake fluid consumption correlative value relating to a consumption of the brake fluid in the pressure accumulation portion; and failure detection means for driving the master pistons only by the servo pressure using the servo pressure generation portion in a state where the brake operation member is not operated, and detecting a failure of a master system, based on a brake fluid consumption correlative value detected by the brake fluid consumption correlative value detection means at that time.
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1. A vehicle brake device in which master piston is driven by any one of a force corresponding to an operation force of a brake operation member and a force corresponding to a servo pressure in a servo chamber to generate a master cylinder pressure, the device comprising: a pressure accumulation por
1. A vehicle brake device in which master piston is driven by any one of a force corresponding to an operation force of a brake operation member and a force corresponding to a servo pressure in a servo chamber to generate a master cylinder pressure, the device comprising: a pressure accumulation portion that accumulates the brake fluid under pressure;a servo pressure generation portion that is configured to be able to generate the servo pressure using the brake fluid in the pressure accumulation portion regardless of the operation of the brake operation member;brake fluid consumption correlative value detection means for detecting a brake fluid consumption correlative value which always correlates with a consumption of the brake fluid in the pressure accumulation portion; andfailure detection means for driving the master piston only by the servo pressure using the servo pressure generation portion in a state where the brake operation member is not operated, and detecting a failure of a master system caused by brake fluid leakage from the master system, based on a brake fluid consumption correlative value detected by the brake fluid consumption correlative value detection means at that time. 2. The vehicle brake device according to claim 1, further comprising: a verification chamber, a volume of which is decreased along with advancement of the master piston,wherein the failure detection means detects the failure of the master system, based on the servo pressure and the pressure of the verification chamber as the brake fluid consumption correlative value. 3. The vehicle brake device according to claim 1, further comprising: fluid pressure chambers, a volume of which is reduced along with advancement of the master piston, and which generates the master cylinder pressure; andadjustment supply means that is placed between the fluid pressure chamber and the wheel cylinder, is configured to able to adjust the brake liquid supplied from the liquid pressure chamber, and supplies the adjusted brake liquid to the wheel cylinder,wherein the failure detection means performs the failure detection of the master system, after closing an input valve that is provided at an input side of the adjustment supply means. 4. The vehicle brake device according to claim 1, further comprising: fluid pressure chambers, a volume of which is reduced along with advancement of the master piston, and which generates the master cylinder pressure;adjustment supply means that is placed between the fluid pressure chamber and the wheel cylinder, is configured to able to adjust the brake liquid supplied from the fluid pressure chamber, and supplies the adjusted brake liquid to the wheel cylinder; andswitching valves that are placed between the fluid pressure chamber and the adjustment supply means to connect/disconnect the fluid pressure chamber and the adjustment supply means,wherein the failure detection means performs the failure detection of the master system after closing the switching valves. 5. The vehicle brake device according to claim 2, further comprising: fluid pressure chambers, a volume of which is reduced along with advancement of the master piston, and which generates the master cylinder pressure; andadjustment supply means that is placed between the fluid pressure chamber and the wheel cylinder, is configured to able to adjust the brake liquid supplied from the liquid pressure chamber, and supplies the adjusted brake liquid to the wheel cylinder,wherein the failure detection means performs the failure detection of the master system, after closing an input valve that is provided at an input side of the adjustment supply means. 6. The vehicle brake device according to claim 2, further comprising: fluid pressure chambers, a volume of which is reduced along with advancement of the master piston, and which generates the master cylinder pressure;adjustment supply means that is placed between the fluid pressure chamber and the wheel cylinder, is configured to able to adjust the brake liquid supplied from the fluid pressure chamber, and supplies the adjusted brake liquid to the wheel cylinder; andswitching valves that are placed between the fluid pressure chamber and the adjustment supply means to connect/disconnect the fluid pressure chamber and the adjustment supply means,wherein the failure detection means performs the failure detection of the master system after closing the switching valves.
Hiroshi Isono JP; Yasuji Mizutani JP, Vehicle braking system having devices for controlling fluid flows between pressurizing and assisting chambers of master cylinder and pressure source and reservoir.
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