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.
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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