Electricity: motive power systems – Braking – Dynamic braking
Patent
1996-08-05
1998-02-03
Ip, Paul
Electricity: motive power systems
Braking
Dynamic braking
318370, 318139, 180 651, 36442402, H02P 700, B60K 102
Patent
active
057148562
ABSTRACT:
A system and methods that provide for battery regeneration in electric vehicles without employing brake blending. Wheel speed sensors provide speed inputs to a controller, for example, that are processed to control the torque commands issued to a motor of the vehicle, which allows a higher level of battery regeneration without causing drive wheels to lock up. In the present invention, speed inputs derived from the wheel speed sensors are sampled. The absolute value of the difference between the input signals derived from the wheel speed sensors is compared to a predetermined difference threshold. If the absolute value of the difference between the input signals is less than the predetermined difference threshold, a regeneration torque command is generated to control the torque output of the motor that is equal to a current value of the regeneration torque command. If the absolute value of the difference between the input signals is greater than or equal to the predetermined difference threshold, a regeneration torque command is generated that is equal to the current value of the regeneration torque command times a reduction scale factor, to reduce the amount of battery regeneration to a level that does not lock up the wheels.
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Delco Electronics Corporation
Ip Paul
Navarre Mark A.
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