Regenerative brake device and a power transmission device for electric motor vehicles

A regenerative brake device for an electric motor vehicle having a driving wheel, an electric motor, and a battery, comprising: battery charging means for charging the battery with electric power generated by the electric motor; and control means, operatively connected to said battery charging means, for controlling when said battery charging means transfers electric power from the electric motor to the battery by generating control signals having a duty factor and for controlling braking power; said control means controlling said duty factor of said control signals to be set at a small value when a rotational speed of the electric motor is high; said control means controlling said braking power to increase over a predetermined range without having said braking power exceed a predetermined braking power level as a rotational speed of the electric motor increases.

A regenerative braking system for providing braking power without impairing driveability due to excessive braking power, comprising: an electric motor; a driving wheel; power transmission means for connecting said electric motor to said driving wheel; a re-chargeable power source; charging means for charging said re-chargeable power source with electric power generated by said electric motor; and control means, operatively connected to said charging means, for controlling when said charging means transfer electric power to said re-chargeable power source by generating control signals having a duty factor and for controlling braking power; said control means controlling said duty factor of said control signals to be set at a small value when a rotational speed of said electric motor is high; said control means controlling said braking power to increase over a predetermined range without having said braking power exceed a predetermined braking power level as a rotational speed of said electric motor increases.

A power transmission for an electric motor vehicle having an electric motor and driving wheel, comprising: primary clutch means for engaging the electric motor to the driving wheel to transmit a driving torque from the electric motor to the driving wheel when a rotational speed of the electric motor exceeds a predetermined primary rotational speed; and secondary clutch means, operatively connected in parallel with said primary clutch means, for engaging the electric motor to the driving wheel to transmit a driving torque from the electric motor to the driving wheel when the rotational speed of the electric motor exceeds a predetermined secondary rotational speed, said predetermined secondary rotational speed being slower than said predetermined primary rotational speed.

A power transfer system for an electric motor vehicle, comprising: an electric motor; a re-chargeable power source connected to said electric motor; a driving wheel; and transmission means for connecting said electric motor to said driving wheel; said transmission means including, primary clutch means for engaging said electric motor to said driving wheel to transmit a driving torque from said electric motor to said driving wheel when a rotational speed of said electric motor exceeds a predetermined primary rotational speed, and secondary clutch means, operatively connected in parallel with said primary clutch means, for engaging said electric motor to said driving wheel to transmit a driving torque from said electric motor to said driving wheel when said rotational speed of said electric motor exceeds a predetermined secondary rotational speed, said predetermined secondary rotational speed being slower than said predetermined primary rotational speed.