System and method for controlling vehicle speed
First Claim
1. A system for controlling the speed of a vehicle having a powertrain including a power plant operably coupled to a transmission via a torque converter including an output shaft connected to the transmission, the system comprising:
- a control unit configured toreceive a signal indicative of a desired vehicle speed,determine a target speed of the output shaft of the torque converter from the signal indicative of the desired vehicle speed,receive a signal indicative of an actual power plant output speed,receive a signal indicative of actual speed of the output shaft of the torque converter,determine a desired power plant output speed based on the signal indicative of actual speed of the output shaft of the torque converter, the target speed of the output shaft of the torque converter, and the signal indicative of the actual power plant output speed,send a signal to the power plant such that the power plant operates at the desired power plant output speed, andmaintain a desired vehicle speed substantially independent of a magnitude of load on the powertrain.
1 Assignment
0 Petitions
Accused Products
Abstract
A system is provided for controlling the speed of a vehicle having a powertrain including a power plant operably coupled to a transmission. The system includes a control unit configured to receive a signal indicative of vehicle speed, receive a signal indicative of power plant output speed, and determine a desired power plant output speed based on the signal indicative of vehicle speed and the signal indicative of power plant output speed. The control unit is further configured to send a signal to the power plant such that the power plant operates at the desired power plant output speed, and maintain a desired vehicle speed in a manner substantially independent of a magnitude of load on the powertrain.
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Citations
35 Claims
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1. A system for controlling the speed of a vehicle having a powertrain including a power plant operably coupled to a transmission via a torque converter including an output shaft connected to the transmission, the system comprising:
a control unit configured to receive a signal indicative of a desired vehicle speed, determine a target speed of the output shaft of the torque converter from the signal indicative of the desired vehicle speed, receive a signal indicative of an actual power plant output speed, receive a signal indicative of actual speed of the output shaft of the torque converter, determine a desired power plant output speed based on the signal indicative of actual speed of the output shaft of the torque converter, the target speed of the output shaft of the torque converter, and the signal indicative of the actual power plant output speed, send a signal to the power plant such that the power plant operates at the desired power plant output speed, and maintain a desired vehicle speed substantially independent of a magnitude of load on the powertrain. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A vehicle having a powertrain, the vehicle comprising:
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a power plant configured to provide power to the vehicle; a transmission operably coupled to the power plant via a torque converter, the transmission being configured to transfer the power provided by the power plant to propel the vehicle; the torque converter including an output shaft connected to the transmission; driving members configured to propel the vehicle; a control unit configured to control operation of the power plant and the transmission, the control unit being configured to receive a signal indicative of a desired vehicle speed, determine a target speed of the output shaft of the torque converter from the signal indicative of the desired vehicle speed, receive a signal indicative of an actual power plant output speed, receive a signal indicative of actual speed of the output shaft of the torque converter, determine a desired power plant output speed based on the signal indicative of actual speed of the output shaft of the torque converter, the target speed of the output shaft of the torque converter, and the signal indicative of the actual power plant output speed, send a signal to the power plant such that the power plant operates at the desired power plant output speed, and maintain a desired vehicle speed substantially independent of a magnitude of load on the powertrain. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A method for controlling the speed of a vehicle having a powertrain including a power plant coupled to a transmission via a torque converter, the method comprising:
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sensing a signal indicative of vehicle speed; sensing a signal indicative of power plant output speed; determining a desired power plant output speed according to the following;
ω
dpp=TCOStarget×
(ω
actual/TCOSactual),where ω
dpprepresents the desired power plant output speed, TCOStargetrepresents a target speed for an output shaft of the torque converter, TCOSactual represents actual speed of the output shaft of the torque converter, and ω
actualrepresents actual speed of the power plant;sending a signal to the power plant such that the power plant operates at the desired power plant output speed; and maintaining a desired vehicle speed substantially independent of a magnitude of load on the powertrain.
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Specification