Regenerative braking method

Details Regenerative braking method Regenerative braking method

1996-10-07

1998-01-13

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Multiple systems

Fluid pressure and electric

188156, 188158, 303152, 180165, B60T 1374

Patent

active

057071152

ABSTRACT:
In a vehicle with a first set of first and second wheels coupled to an electric drive system capable of providing regenerative braking and a second set of third and fourth wheels, wherein the vehicle dynamically adjusts a brake proportioning between the first and second sets responsive to a determined wheel speed difference between the first and second sets, the improvement comprising a regenerative braking control method according to the steps of: measuring first, second, third and fourth speeds of the first, second, third and fourth wheels; for each wheel of one of the first and second sets, determining a set-off value inversely relational to a commanded brake torque and a wheel deceleration; determining modified wheel speeds for each wheel of said one of the first and second sets responsive to the wheel speeds and the set-off values; and determining the wheel speed difference between the first and second sets responsive to the modified wheels speeds of said one of the first and second sets and the wheel speeds of the other of the first and second sets, wherein the dynamic adjusting of brake proportioning between the first and second sets increases brake torque load on the first and second wheels, increasing an amount of braking achieved regeneratively.

REFERENCES:
patent: 4671577 (1987-06-01), Woods
patent: 4962969 (1990-10-01), Davis
patent: 5318355 (1994-06-01), Asanuma et al.
patent: 5362135 (1994-11-01), Riddiford et al.
patent: 5399000 (1995-03-01), Aoki et al.
patent: 5492192 (1996-02-01), Brooks et al.
patent: 5568962 (1996-10-01), Enomoto et al.

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