Vehicle speed estimation for antilock braking using a chassis ac

Details Vehicle speed estimation for antilock braking using a chassis ac Vehicle speed estimation for antilock braking using a chassis ac

1991-06-10

1996-11-26

Teska, Kevin J.

Boots, shoes, and leggings

36442604, 36442601, 303158, 303182, 303196, 180197, 73117, 73105, 280707, G06F 770

Patent

active

055792308

ABSTRACT:
Before braking occurs the speed of non-driven wheels is monitored and averaged to determine vehicle speed and an integrator is initialized with that speed. Acceleration is periodically calculated from the vehicle speed, stored in a ring buffer and averaged. The output of a chassis accelerometer is also sampled during the same periods and stored in a similar ring buffer and averaged. Accelerometer bias due to slope or drift is determined as the difference of the two averaged accelerations. The noise level of the accelerometer bias is determined by filtering and rectification. After braking occurs, the accelerometer output is corrected by subtracting the bias and the noise and is then used to continuously update the integrator output to provide an estimate of vehicle speed during braking.

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