Brake device

A brake device having a fluid pressure source which generates a fluid pressure based on an operation of a brake operating member, the brake device comprising:

• a brake operating amount detector which detects an operating amount of the brake operating member,
• a fluid source pressure detector which detects the fluid pressure generated in the fluid pressure source,
• a failure detector which detects and distinguishes between different types of abnormal failures of the brake device based on the pressure detected by the fluid source pressure detector and the operating amount detected by the brake operating amount detector, and
• a brake fluid control device which controls the brake fluid pressure in different ways based on the type of the failure detected by the failure detector, wherein the fluid pressure source includes a master cylinder which has a pressure chamber and generates the fluid pressure corresponding to an input power, a first compressing device which compresses an operating fluid of the pressure chamber of the master cylinder and supplies a compressed operating fluid to a brake, a second compressing device which compresses the operating fluid stored in an atmospheric condition in a reservoir chamber, the reservoir chamber is larger than the pressure chamber of the master cylinder, and
• the brake fluid control device includes a brake condition selection device which selects either of a first condition in which the brake is compressed by the first compressing device, or a second condition in which the brake is compressed by the second compressing device based on the type of the failure detected by the failure detector.

A brake device having a fluid pressure source which generates a fluid pressure based on an operation of a brake operating member, the brake device comprising:

• a brake operating amount detector which detects an operating amount of the brake operating member,
• a fluid source pressure detector which detects the pressure generated in the fluid pressure source, and
• a failure detector which detects and distinguishes between different types of abnormal failures of the brake device based on the pressure detected by the fluid source pressure detector and the operating amount detected by the brake operating amount detector,
• wherein the fluid pressure source device includes a master cylinder which generates the fluid pressure corresponding to an input power, and
• the failure detector includes a bottoming detector which detects a bottoming condition in the master cylinder based on whether an increasing gradient of the brake operating amount detected by the brake operating amount detector is larger than a predetermined gradient.

A brake device having a fluid pressure source which generates a fluid pressure based on an operation state of a brake operating member, the brake device comprising:

• a fluid source pressure detector which detects the pressure generated in the fluid pressure source;
• and
• a failure determining device which determines that there is a first abnormal failure when a combination of the operation state of the brake operating member and the fluid pressure is in a first combination state, and determines that there is a second abnormal failure being different from the first abnormal failure if the combination of the operation of the brake operating member and the fluid pressure is in a second combination state, which is different from the first combination state,
• wherein the fluid pressure source includes a master cylinder which generates the fluid pressure corresponding to an input power, and
• the failure determining device has a bottom detector which detects a bottoming condition in the master cylinder based on whether an increasing gradient of a brake operating amount detected by a brake operating amount detector is larger than a predetermined gradient.

A brake device having a fluid pressure source device which generates a fluid pressure based on an operation state of a brake operating member, the brake device comprising:

• a fluid source pressure detector which detects the pressure generated in the fluid pressure source device;
• a failure determining device which determines that there is a first abnormal failure when a combination of an operation of the brake operating member and the fluid pressure is in a first combination state, and determines that there is a second abnormal failure being different from the first abnormal failure if the combination of the operation of the brake operating member and the fluid pressure is in a second combination, which is different from the first combination state;
• and
• a brake fluid control device which controls the brake fluid pressure in a first way when the failure determining device determines that there is the first abnormal failure, and controls the brake fluid in a second way, which is different from the first way, when the failure determining device determines that there is the second abnormal failure,
• wherein the fluid pressure source includes a master cylinder which generates the fluid pressure corresponding to an input power, and
• the failure determining device has a bottom detector which detects a bottoming condition in the master cylinder based on whether an increasing gradient of the brake operating amount detected by a brake operating amount detector is larger than a predetermined gradient.