| 摘要 |
A feedback control system includes an actuator for selecting engine throttle position and another actuator for adjusting the ratio setting of an infinitely variable transmission through which the engine delivers its output power. Also included are sensors for measuring engine crankshaft speed and engine power output. When the control system is used in a passenger car, the accelerator pedal position is employed to command engine power output according to a predetermined relationship. The throttle actuator then adjusts throttle opening until the actual output as measured by the power sensor equals the commanded power output. Similarly, the transmission ratio is adjusted to establish a specific relationship between accelerator pedal position and engine crankshaft speed, but the commanded crankshaft speed is usually low enough to require full throttle engine operation to achieve the correspondingly commanded power output. When lacking an overdrive transmission ratio extreme enough to limit engine speed to the commanded value, the control system will nevertheless establish the commanded power level by closing the throttle an appropriate amount from its wide open position. Thus the control system seeks wide open throttle engine operating conditions whenever consistent with practical engine speeds and available transmission ratios.
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