Constant speed control system
First Claim
1. A method for controlling a low speed operation of a vehicle comprising the steps of:
- actuating a speed control activation switch;
calculating a target vehicle speed in response to an accelerator pedal demand as determined by an accelerator pedal position where each respective accelerator pedal position is associated with a respective predetermined target vehicle speed;
determining a vehicle turning geometry in response to a steering wheel angle input;
calculating a target wheel speed of each of a plurality of vehicle wheels as a function of said target vehicle speed and said turning geometry;
measuring an actual wheel speed of each wheel of said vehicle;
determining a net torque in response to said target wheel speeds and said actual wheel speeds;
determining an engine output torque and a braking torque in response to said net torque that will cooperatively maintain said vehicle at said target vehicle speed; and
controlling said engine output torque and said braking torque such that said target vehicle speed is maintained.
3 Assignments
0 Petitions
Accused Products
Abstract
A method is provided for controlling a low speed operation of a vehicle. A speed activation switch is activated. A target vehicle speed is calculated in response to an accelerator pedal demand as determined by an accelerator pedal position where each respective accelerator pedal position is associated with a respective predetermined target vehicle speed. A vehicle turning geometry is determined in response to a steering wheel angle input. A target wheel speed of each of a plurality of vehicle wheels is calculated as a function of the target vehicle speed and turning geometry. An actual wheel speed of each wheel is measured. A net torque is determined in response to the target wheel speeds and actual wheel speeds. An engine output torque and a braking torque are determined in response to the net torque. The engine output torque and the total vehicle braking torque are controlled for cooperatively maintaining the target vehicle speed.
109 Citations
11 Claims
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1. A method for controlling a low speed operation of a vehicle comprising the steps of:
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actuating a speed control activation switch; calculating a target vehicle speed in response to an accelerator pedal demand as determined by an accelerator pedal position where each respective accelerator pedal position is associated with a respective predetermined target vehicle speed; determining a vehicle turning geometry in response to a steering wheel angle input; calculating a target wheel speed of each of a plurality of vehicle wheels as a function of said target vehicle speed and said turning geometry; measuring an actual wheel speed of each wheel of said vehicle; determining a net torque in response to said target wheel speeds and said actual wheel speeds; determining an engine output torque and a braking torque in response to said net torque that will cooperatively maintain said vehicle at said target vehicle speed; and controlling said engine output torque and said braking torque such that said target vehicle speed is maintained. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for controlling a low speed operation of a vehicle comprising the steps of:
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actuating a speed control activation switch; sensing a steering wheel angle of a vehicle; sensing an acceleration pedal demand; measuring a wheel speed of each of a plurality of vehicle wheels; determining a vehicle turning geometry in response to a steering wheel angle input; calculating a target vehicle speed in response to an accelerator pedal demand determined by an accelerator pedal position where each respective accelerator pedal position is associated with a respective predetermined target vehicle speed; calculating a target wheel speed of each of a plurality of vehicle wheels as a function of said target vehicle speed and said turning geometry; determining a net torque in response to said target wheel speeds and said measured wheel speeds; determining an engine output torque and a braking torque in response to said net torque for cooperatively maintaining said vehicle at said target vehicle speed; transmitting an engine output torque control signal to a powertrain control module for changing said output torque for maintaining said vehicle target speed without stalling an engine of said vehicle; and selectively applying a braking torque to said plurality of vehicle wheels for cooperatively maintaining said target vehicle speed. - View Dependent Claims (10, 11)
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Specification