Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Indication or control of braking – acceleration – or deceleration
Reexamination Certificate
1999-08-12
2001-02-20
Cuchlinski, Jr., William A. (Department: 3661)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Indication or control of braking, acceleration, or deceleration
C701S083000, C303S155000, C180S244000, C188S024140
Reexamination Certificate
active
06192307
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a braking force control system which is arranged to calculate a target total braking force for achieving a target vehicle speed and to generate a wheel braking force and an engine braking force so as to correspond the sum of them to the target total braking force.
A Japanese Patent Provisional Publication No. 7-81463 discloses a total vehicle power control apparatus which is arranged to set several target values for achieving a target total braking force and to execute a target value follow-up control of the target values. This apparatus is arranged such that the target total braking force is mainly achieved by a generable engine brake force and a remaining thereof is compensated by a wheel braking force. This apparatus is further arranged to increase a ratio of the wheel braking force in the total braking force for improving the responsibility of the target total braking force follow-up control.
SUMMARY OF THE INVENTION
However, this conventional braking force control system is required to further improve a follow-up characteristic of an actual total braking force with respect to the target total braking force.
It is an object of the present invention to provide an improved braking force control system which improves its total responsibility by enhancing a follow-up characteristic during a first half of a transient period.
A braking force control system according to the present invention is for a vehicle and comprises a vehicle operating condition detector, an engine braking force actuator, a wheel braking force actuator and a controller. The vehicle operating condition detector detects an operating condition of the vehicle. The engine braking force actuator varies an engine braking force. The wheel braking force actuator varies a wheel braking force applied to each wheel. The controller is connected to the vehicle operating condition detector, the engine braking force actuator and the wheel braking force actuator. The controller determines a target total braking force on the basis of the vehicle operating condition, a target transmission ratio and a target engine output on the basis of the target total braking force. The controller calculates an engine braking force on the basis of the vehicle operating condition. The controller extracts a fast component of the target total braking force. The controller determines a target wheel braking force on the basis of the fast component. The controller controls the wheel braking force actuator so as to correspond the actual wheel braking force to the target wheel braking force.
REFERENCES:
patent: 4989149 (1991-01-01), Mimura et al.
patent: 5864769 (1999-01-01), Inagaki et al.
Kawabe Taketoshi
Okamoto Masaru
Yamamura Yoshinori
Beaulieu Yonel
Cuchlinski Jr. William A.
Foley & Lardner
Nissan Motor Co,. Ltd.
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