Steer by brake control system
First Claim
1. A turn control system for a vehicle having four wheels and a steering wheel that controls the steering of two of the wheels, the system comprising:
- a brake system having four brakes with each of said brakes capable of applying an individual brake torque to a respective one of said four wheels;
a steering wheel angle sensor for sensing an angle of rotation of said steering wheel;
an acceleration sensing device for sensing an acceleration demand;
a wheel speed sensing device for sensing a wheel speed for each of the four wheels;
a turn control activation switch for enabling said turn control system and for shifting a vehicle transmission to one of a low or reverse operating gear; and
a brake control module for calculating a target vehicle speed in response to said acceleration demand;
a vehicle turning geometry in response to an angle of the steering wheel; and
target wheel speeds for each of said wheels in response to said target vehicle speed and said vehicle turning geometry; and
for generating a braking torque command signal for modulating said brake torque on said four brakes and generating an engine torque command signal for modulating an engine torque for producing said target vehicle speed, and applying a respective additional braking torque to at least one of the brakes for reducing said vehicle turning radius while maintaining said vehicle target speed.
3 Assignments
0 Petitions
Accused Products
Abstract
A turn control system is provided having four wheels and a steering wheel that controls the vehicle steering. A steering wheel angle sensor senses an angle of rotation of the steering wheel. An acceleration sensing device senses an acceleration demand. A wheel speed sensing device senses a wheel speed for each of the four wheels. A turn control activation switch enables the turn control system and shifts a vehicle transmission to one of a low or reverse operating gear. A brake control module calculates a target vehicle speed, a vehicle turning geometry, and target wheel speeds. A braking torque command signal is generated for modulating the brake torque. An engine torque command signal is generated for modulating an engine torque for producing the target vehicle speed. A respective additional braking torque is applied to at least one of the wheels for reducing the vehicle turning radius while maintaining the vehicle target speed.
35 Citations
17 Claims
-
1. A turn control system for a vehicle having four wheels and a steering wheel that controls the steering of two of the wheels, the system comprising:
-
a brake system having four brakes with each of said brakes capable of applying an individual brake torque to a respective one of said four wheels; a steering wheel angle sensor for sensing an angle of rotation of said steering wheel; an acceleration sensing device for sensing an acceleration demand; a wheel speed sensing device for sensing a wheel speed for each of the four wheels; a turn control activation switch for enabling said turn control system and for shifting a vehicle transmission to one of a low or reverse operating gear; and a brake control module for calculating a target vehicle speed in response to said acceleration demand;
a vehicle turning geometry in response to an angle of the steering wheel; and
target wheel speeds for each of said wheels in response to said target vehicle speed and said vehicle turning geometry; and
for generating a braking torque command signal for modulating said brake torque on said four brakes and generating an engine torque command signal for modulating an engine torque for producing said target vehicle speed, and applying a respective additional braking torque to at least one of the brakes for reducing said vehicle turning radius while maintaining said vehicle target speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A method for controlling a turn radius of a vehicle having four wheels and four brakes, with each brake capable of applying a braking torque to a respective one of the four wheels, the method comprising the steps of:
-
determining a vehicle turning geometry in response to a steering wheel angle and a measured vehicle speed; calculating a target vehicle speed in response to an acceleration pedal demand; calculating a target wheel speed of each of said four wheels as a function of said target vehicle speed; determining an engine output torque and a total vehicle braking torque for cooperatively maintaining said vehicle at said target vehicle speed; modulating said engine output torque and said total vehicle braking torque for cooperatively maintaining said target vehicle speed; and modifying said braking torque applied to at least one of the wheels for reducing said turn radius of said vehicle while maintaining said target vehicle speed. - View Dependent Claims (11, 12, 13, 14, 15, 16)
-
-
17. A method for controlling a turn radius of a vehicle having four wheels and four brakes, with each brake capable of applying a braking torque to a respective one of the four wheels, the method comprising the steps of:
-
shifting a transmission of a vehicle into a low gear; sensing a steering wheel angle of a vehicle; sensing an acceleration pedal demand; sensing a wheel speed of each of said wheels; determining a target vehicle speed in response to said acceleration pedal demand; determining a turning geometry in response to said steering wheel angle; calculating target wheel speeds for each of said wheels in response to said target vehicle speed and said turning geometry; determining an engine torque and a total vehicle braking torque for cooperatively maintaining a constant vehicle speed in response to said vehicle wheel speeds and said actual vehicle wheel speeds; and modifying said braking torque to at least one vehicle wheel for reducing a vehicle turning radius while maintaining said vehicle target speed.
-
Specification