| 摘要 |
An electronic control (31) is provided for a vehicle (10) having an engine (12), a main drive (14) driven by the engine (12), a fluid pump (36) driven by the engine (12) for providing pressurized fluid, and a supplemental drive driven (30) by the pressurized fluid. The electronic control (31) includes a main drive sensor (54) for sensing the speed of the main drive (14) and responsively producing a main drive speed signal. A vehicle speed sensor (64) senses the speed of the vehicle (10) relative to the ground and produces a vehicle ground speed signal. A pressure sensor (74) senses the pressure of the pressurized fluid supplied to the supplemental drive (30) by the pump (36) and responsively produces an actual pressure signal. A processor (52) receives the main drive speed, vehicle ground speed, and actual pressure signals, produces a slip ratio signal responsive to a ratio of the main drive speed and vehicle ground speed signals, produces a desired pressure signal responsive to the slip ratio signal, produces an error signal responsive to a difference between the desired and actual pressure signals, and controls the fluid pressure in the supplemental drive (30) in response to the error signal.
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