System and method for controlling vehicle speed
First Claim
1. A system for controlling the speed of a vehicle having a power plant and a transmission, the system comprising:
- a control unit configured to;
receive a signal indicative of the speed of the vehicle,receive a signal indicative of a gear ratio of the transmission,receive a signal indicative of a desired vehicle speed range associated with the gear ratio,determine a desired output speed of the power plant according to;
ω
dpp=m(vv)+bwherein ω
dpp is the desired output speed of the power plant, m is a predetermined constant, vv correlates to the signal indicative of the speed of the vehicle, and b is determined from the signal indicative of the gear ratio of the transmission and the desired vehicle speed range associated with the gear ratio, andsend a signal to the power plant such that the power plant operates at the desired output speed, wherein the desired output steed substantially maintains the speed of the vehicle substantially independent of a magnitude of load on the power plant, wherein the power plant and the transmission are operably coupled via a torque converter.
1 Assignment
0 Petitions
Accused Products
Abstract
A system is provided for controlling the speed of a vehicle having a power plant and a transmission. A control unit is configured to receive a signal indicative of the speed of the vehicle. The control unit is further configured to determine a desired output speed of the power plant based on the signal indicative of the speed of the vehicle, a signal indicative of the gear ratio of the transmission, and a desired vehicle speed associated with the gear ratio. The control unit is also configured to send a signal to the power plant, such that power plant operates at an output speed that substantially maintains the desired vehicle speed in a manner substantially independent of a magnitude of load on the power plant.
37 Citations
27 Claims
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1. A system for controlling the speed of a vehicle having a power plant and a transmission, the system comprising:
a control unit configured to; receive a signal indicative of the speed of the vehicle, receive a signal indicative of a gear ratio of the transmission, receive a signal indicative of a desired vehicle speed range associated with the gear ratio, determine a desired output speed of the power plant according to;
ω
dpp=m(vv)+bwherein ω
dpp is the desired output speed of the power plant, m is a predetermined constant, vv correlates to the signal indicative of the speed of the vehicle, and b is determined from the signal indicative of the gear ratio of the transmission and the desired vehicle speed range associated with the gear ratio, andsend a signal to the power plant such that the power plant operates at the desired output speed, wherein the desired output steed substantially maintains the speed of the vehicle substantially independent of a magnitude of load on the power plant, wherein the power plant and the transmission are operably coupled via a torque converter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A vehicle comprising:
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a power plant to provide power to the vehicle; a transmission operably coupled to the power plant via a torque converter; driving members operably coupled to the transmission, wherein the transmission is configured to transfer the power provided by the power plant to the driving members to propel the vehicle; and 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 speed of the vehicle, receive a signal indicative of a near ratio of the transmission, receive a signal indicative of a desired vehicle speed range associated with the gear ratio, determine a desired output speed of the power plant based on the signal indicative of the speed of the vehicle, the signal indicative of the gear ratio of the transmission, and the desired vehicle speed range associated with the gear ratio, and send a signal to the power plant such that the power plant operates at the desired output speed, wherein the desired output speed maintains the speed of the vehicle substantially independent of a magnitude of load on the power plant. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method for controlling the speed of a vehicle having a power plant and a transmission, the method comprising:
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sensing a signal indicative of the speed of the vehicle; determining a desired output speed of the power plant according to;
ω
dpp=m(vv)+b,wherein ω
dpp is the desired output speed of the power plant, m is a predetermined constant, vv correlates to the signal indicative of the speed of the vehicle, and b is determined from a signal indicative of the gear ratio provided by the transmission and a desired vehicle speed associated with the gear ratio;sending a signal to the power plant such that the power plant operates at the desired output speed of the power plant, wherein the desired output speed of the power plant substantially maintains the speed of the vehicle substantially independent of a magnitude of load on the power plant.
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Specification