Automatic speed control system
First Claim
1. A constant-speed cruise control system for a vehicle comprising:
- means for detecting an actual speed of a vehicle,means, manually operated by a driver, for setting a target speed for the vehicle,means for controlling the actual speed of the vehicle so that is approaches the target speed by adjusting an engine output,down-shift means for making a down-shift operation of a transmission so as to accomplish the target speed under a predetermined condition when the vehicle runs on an uphill road,detecting means for detecting a maximum value of the engine output after the down-shift operation is made,difference detecting means for detecting a difference between said maximum value and a present value of the engine output, anduphill end judge means for judging that an end of the uphill road has been reached by the vehicle when said difference exceeds a first predetermined value.
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Accused Products
Abstract
An automatic speed control system has a device for detecting an actual speed of vehicle, a device for setting a target speed of the vehicle, and a device for controlling the actual speed so that it approaches the target speed by adjusting a throttle opening. The improved system includes a down-shift device for making a down-shift operation of a transmission so as to accomplish the target speed under a predetermined condition when the vehicle runs on an uphill rod, and uphill end judge device for holding that an end of the uphill road has been reached when the throttle opening is reduced beyond a predetermined value from a maximum value after the down-shift operation. An uphill end of a short length can be properly detected so that a desirable speed control can be accomplished.
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Citations
9 Claims
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1. A constant-speed cruise control system for a vehicle comprising:
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means for detecting an actual speed of a vehicle, means, manually operated by a driver, for setting a target speed for the vehicle, means for controlling the actual speed of the vehicle so that is approaches the target speed by adjusting an engine output, down-shift means for making a down-shift operation of a transmission so as to accomplish the target speed under a predetermined condition when the vehicle runs on an uphill road, detecting means for detecting a maximum value of the engine output after the down-shift operation is made, difference detecting means for detecting a difference between said maximum value and a present value of the engine output, and uphill end judge means for judging that an end of the uphill road has been reached by the vehicle when said difference exceeds a first predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification