| 摘要 |
A versatile system for preventing spinning of driving wheels, especially for commercial road vehicles, is provided by a braking control system in which a logic system responds not only to positive slip (overdriving) of each driven wheel, but also to negative slip (overbraking) thereof and, likewise, not only to over-acceleration, but also to excessive deceleration of the driven wheels. The cycle of control is started by an over-acceleration signal and terminates by the timing-out of a control phase in which hydraulic brake pressure is reduced. Within a control cycle, brake pressure builds up for a driven wheel in response to the simultaneous occurrence of any one of the following four pairs of conditions at that wheel: (a) presence of over-acceleration and of negative slip; (b) presence of over-acceleration and of positive slip; (c) presence of over-acceleration and absence of negative slip, and (d) presence of over-deceleration and of positive slip. For purposes of braking, but not for purposes of reducing engine torque, when over-acceleration occurs at a first driving wheel at one side of the vehicle, a pseudo-positive-slip signal is generated for the driving wheel on the other side, but that pseudo-signal is suppressed if at the first driving wheel there appears a slip signal or an overdeceleration signal.
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