Electricity: motive power systems – Braking – Dynamic braking
Reexamination Certificate
1999-09-15
2001-01-23
Ro, Bentsu (Department: 2837)
Electricity: motive power systems
Braking
Dynamic braking
C318S139000, C477S040000, C180S065230
Reexamination Certificate
active
06177773
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a regeneration control device for use in a hybrid vehicle powered by an engine and an assist motor, which device controls a regenerative deceleration system to charge a power accumulator with electric energy regenerated from the motor working as a generator while decelerating the vehicle.
Typically, a hybrid vehicle is powered by its engine and an assist motor and has a system of braking in which the motor becomes a generator, the output of which is determined depending upon a degree of deceleration of the vehicle and is returned to a power accumulator composed of batteries and condensers for supplying power to drive the motor.
However, the conventional regeneration control system of the hybrid vehicle, in which electric energy is generated by a driving motor-generator while the vehicle running downward on a slope using its regenerative deceleration system and is returned to a power accumulator of the driving motor, involves the following problem:
When driving the hybrid vehicle downward along a slope with frequently applying regenerative braking function, a driver may often experience that the accumulator is soon charged to its full capacity and further regenerative braking becomes ineffective. In this instance, the driver may lose the feeling in effective deceleration of the vehicle and may feel strange in driving the vehicle.
SUMMARY OF THE INVENTION
Accordingly, a primary object of the present invention is to provide a regeneration control device for a hybrid vehicle, which device can control a regenerative power system including an internal combustion engine, driving wheels drivable by the internal combustion engine, a motor for additionally supplying electric energy for driving the driving wheels, a transmission between the engine, motor and driving wheels and an accumulator for supplying the motor with electric power, wherein the motor during deceleration of the vehicle can work as a generator whose output is depending upon the deceleration degree and is returned to charge the accumulator, and which device has calculating means for determining the degree of slope of a road whereon the vehicle is running downward and regeneration correcting means for correcting an amount of electric energy to be regenerated from the motor-generator according to the downward road slope determined by the calculating means while the motor works as the generator whose output is therefore corrected by the correcting means in such a way that the accumulator may not be fully charged to assure effective regenerative braking while vehicle descending on the slope.
Another object of the present invention is to provide a regeneration control device for a hybrid vehicle, which is further provided with transmission correcting means for correcting a transmission gear ratio of an automatic transmission, if such is used, according to the degree of slope of a road, calculated by a calculating means while the vehicle running downward thereon applying its regenerative braking. This can give a driver a feeling of constant deceleration of the hybrid vehicle while driving the vehicle downward on the slope.
REFERENCES:
patent: 5650713 (1997-07-01), Takeuchi et al.
patent: 5984034 (1999-11-01), Morisawa et al.
patent: 6033338 (2000-03-01), Jackson et al.
patent: 6059064 (2000-05-01), Nagano et al.
Kuroda Shigetaka
Nakano Kenji
Wakashiro Teruo
Honda Giken Kogyo Kabushiki Kaisha
Kintner Arent Fox
Plotkin & Kahn PLLC
Ro Bentsu
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