System to measure vehicle longitudinal acceleration; has wheel speed unit, unit to measure longitudinal acceleration and unit to calculate alteration rate of wheel speed

摘要

The system has a unit to produce a wheel speed signal. A second unit produces a signal for a longitudinal acceleration of the vehicle. A third unit differentiates the first signal with respect to time, to produce a signal indicating the alteration rate of the wheel speed. A unit combines filtered signals from the second and third units to produce a signal indicating longitudinal acceleration of the vehicle. The system has a first unit to determine the speed of at least one wheel, to produce a wheel speed signal. A second unit produces a signal for a longitudinal acceleration of the vehicle. A third unit differentiates the first signal with respect to time, to produce a signal indicating the alteration rate of the wheel speed. A fourth unit filters the second signal, to remove its low frequency components. A fifth unit filters the third signal, to remove its high frequency components. A sixth unit combines the fourth and fifth signals, to produce a signal indicating longitudinal acceleration of the vehicle.