Vehicle drive force controller
First Claim
1. A drive force control device for use with a vehicle, said vehicle being provided with an accelerator pedal, an engine comprising a throttle which responds to the accelerator pedal, a drive shaft and a continuously variable transmission which varies a rotation speed of said engine at an arbitrary drive ratio, said transmission having an input shaft joined to said engine and an output shaft joined to said drive shaft, said device comprising:
- a sensor for detecting a vehicle speed;
a sensor for detecting a depression degree of the accelerator pedal;
a sensor for detecting a rotation speed of said input shaft;
a sensor for detecting a rotation speed of said output shaft; and
a microprocessor programmed to;
calculate a required drive shaft drive torque from the vehicle speed and the depression degree of the accelerator pedal,calculate a target input shaft rotation speed to achieve said required drive shaft torque with the least fuel consumption of the engine based on the vehicle speed,control said continuously variable transmission so that the rotation speed of said input shaft is equal to the target input shaft rotation speed,calculate a target engine output torque required to generate said required drive shaft drive torque, andcontrol said throttle so that the output torque of said engine is equal to the target engine output torque.
1 Assignment
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Accused Products
Abstract
In a vehicle equipped with a continuously variable transmission, sensors detect a vehicle speed, an accelerator depression degree and an output rotation speed of the transmission. The minimum required drive shaft drive torque is calculated from the vehicle speed and the accelerator depression degree. A target input rotation speed of the transmission for achieving the minimum required drive shaft drive torque with the least engine fuel consumption is calculated according to the vehicle speed. The input rotation speed is controlled to this target input rotation speed. The target engine output torque to generate the minimum required drive shaft drive torque is calculated, and an engine throttle opening is controlled to obtain this torque. As a result, the required vehicle drive force is obtained with the minimum engine fuel consumption.
20 Citations
9 Claims
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1. A drive force control device for use with a vehicle, said vehicle being provided with an accelerator pedal, an engine comprising a throttle which responds to the accelerator pedal, a drive shaft and a continuously variable transmission which varies a rotation speed of said engine at an arbitrary drive ratio, said transmission having an input shaft joined to said engine and an output shaft joined to said drive shaft, said device comprising:
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a sensor for detecting a vehicle speed; a sensor for detecting a depression degree of the accelerator pedal; a sensor for detecting a rotation speed of said input shaft; a sensor for detecting a rotation speed of said output shaft; and a microprocessor programmed to; calculate a required drive shaft drive torque from the vehicle speed and the depression degree of the accelerator pedal, calculate a target input shaft rotation speed to achieve said required drive shaft torque with the least fuel consumption of the engine based on the vehicle speed, control said continuously variable transmission so that the rotation speed of said input shaft is equal to the target input shaft rotation speed, calculate a target engine output torque required to generate said required drive shaft drive torque, and control said throttle so that the output torque of said engine is equal to the target engine output torque. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A drive force control device for use with a vehicle, said vehicle being provided with an accelerator pedal, an engine comprising a throttle which responds to the accelerator pedal, a drive shaft and a continuously variable transmission which varies a rotation speed of said engine at an arbitrary drive ratio, said transmission having an input shaft joined to said engine and an output shaft joined to said drive shaft, said device comprising:
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means for detecting a vehicle speed; means for detecting a depression degree of the accelerator pedal; means for detecting a rotation speed of said input shaft; means for detecting a rotation speed of said output shaft; means for calculating a required drive shaft drive torque from the vehicle speed and the depression degree of the accelerator pedal; means for calculating a target input shaft rotation speed to achieve said required drive shaft drive torque with the least fuel consumption of the engine based on the vehicle speed; means for controlling said continuously variable transmission so that the rotation speed of said input shaft is equal to the target input shaft rotation speed; means for calculating a target engine output torque required to generate said required drive shaft drive torque; and means for controlling said throttle so that the output torque of said engine is equal to the target engine output torque.
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Specification