Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Indication or control of braking – acceleration – or deceleration
Reexamination Certificate
2001-08-30
2003-03-11
Arthur, Gertrude (Department: 3661)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Indication or control of braking, acceleration, or deceleration
C701S078000, C701S083000, C303S155000
Reexamination Certificate
active
06532411
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a brake device for a vehicle and, in particular, relates to a brake booster control device in a brake device and a method of controlling the same.
2. Conventional Art
JP-A-2000-289592, for example, discloses a pressurized booster controlled by a microcomputer provided with a stroke sensor for detecting a control amount of a brake pedal and a brake pedal pressing force sensor and further discloses a brake control device for a vehicle provided with braking judgement means for judging brake pedal pressing by a driver based on the operating condition of these sensors.
However, in the brake control device for a vehicle disclosed in JP-A-2000-289592, there was a problem that such as the stroke sensor for detecting a control amount of a brake pedal and the brake pedal pressing force sensor have to be installed. Accordingly, there arose problems that time for attaching these sensors and for attachment position adjustment and a complex structure for the attachment are additionally required.
SUMMARY OF THE INVENTION
The present invention is achieved in view of the above problems and an object of the present invention is to provide a brake booster control device and a method of controlling the same which can judge whether a driver has pressed a brake pedal without installing a special sensor such as a stroke sensor and a brake pedal pressing force sensor.
Namely, a brake booster control device according to the present invention which achieves the above object includes a function of judging that a driver has pressed a brake pedal based on at least one of the following information is obtained, in that when an output (a master cylinder pressure) lager by a predetermined amount than an output (master cylinder pressure) which is expected from a control amount applied to a control valve is obtained, when an output larger by a predetermined amount than a control target output (target master cylinder pressure) is obtained and when an output variation larger in its increasing direction by a predetermined amount than a variation component of a control target output (target master cylinder pressure) is obtained, thereby, a provision of the stroke sensor and the brake pedal pressing force sensor is eliminated. As a result, the structure of a booster is simplified and the attachment work and the attachment position adjustment work of the stroke sensor and the brake pedal pressing force sensor are also eliminated.
REFERENCES:
patent: 5992947 (1999-11-01), Tsubouchi
patent: 6282896 (2001-09-01), Wachi et al.
patent: 197 44 053 (1998-10-01), None
patent: 0 901 948 (1999-03-01), None
patent: 2 792 898 (2000-11-01), None
patent: 2000289592 (2000-10-01), None
Kuragaki Satoru
Manaka Toshio
Yoshikawa Tokuji
Crowell & Moring LLP
Hitachi , Ltd.
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