Method and system for vehicle ESC system using map data
First Claim
1. An improved Electronic Stability Control system for a vehicle comprising:
- a map database that includes data that indicates properties of roads in a road network upon which the vehicle travels;
a positioning system operably coupled to the map database to determine a position of the vehicle on a road in the road network;
an electronic control unit comprising a processor operable to execute programming functions, wherein said electronic control unit is operably coupled to sensors that indicate a vehicle direction and a steering wheel position, and further wherein said electronic control unit is operably coupled to the positioning system to receive information indicating the position of the vehicle on the road, and wherein said electronic control unit includes outputs to brake actuators associated with brakes associated with individual wheels of said vehicle; and
a ESC program run on the electronic control unit that uses inputs from the sensors and information from the map database that indicates a property of the road upon which the vehicle is located to determine whether to provide an output to the brake actuators to reduce a difference between an intended vehicle direction and an actual vehicle direction.
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Accused Products
Abstract
An Electronic Stability Control (ESC) system for a vehicle is disclosed. An electronic control unit (ECU) is programmed to reduce vehicle lateral skidding by reducing differences between an intended vehicle direction and/or yaw rate and an actual vehicle direction and/or yaw rate by applying modifications to operation of the vehicle brakes and/or throttle. The ESC system receives inputs from wheel speed sensors, a steering wheel position sensor, a yaw rate sensor and a lateral acceleration sensor. The ESC system also receives input that indicates at least a property of the road upon which the vehicle is located, wherein the road upon which the vehicle is located is determined from a positioning system that uses a map database and the property is determined from the map database. The ESC system incorporates the road property information in determining when and/or how to modify operation of the vehicle to reduce vehicle skidding.
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Citations
32 Claims
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1. An improved Electronic Stability Control system for a vehicle comprising:
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a map database that includes data that indicates properties of roads in a road network upon which the vehicle travels; a positioning system operably coupled to the map database to determine a position of the vehicle on a road in the road network; an electronic control unit comprising a processor operable to execute programming functions, wherein said electronic control unit is operably coupled to sensors that indicate a vehicle direction and a steering wheel position, and further wherein said electronic control unit is operably coupled to the positioning system to receive information indicating the position of the vehicle on the road, and wherein said electronic control unit includes outputs to brake actuators associated with brakes associated with individual wheels of said vehicle; and a ESC program run on the electronic control unit that uses inputs from the sensors and information from the map database that indicates a property of the road upon which the vehicle is located to determine whether to provide an output to the brake actuators to reduce a difference between an intended vehicle direction and an actual vehicle direction. - View Dependent Claims (2, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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3. An improved Electronic Stability Control system for a vehicle comprising:
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a map database that includes data that indicates properties of roads in a road network upon which the vehicle travels; a positioning system operably coupled to the map database to determine a position of the vehicle on a road in the road network; an electronic control unit comprising a processor operable to execute programming functions, wherein said electronic control unit is operably coupled to sensors that indicate a vehicle direction and a steering wheel position, and further wherein said electronic control unit is operably coupled to the positioning system to receive information indicating the position of the vehicle on the road, and wherein said electronic control unit includes outputs to brake actuators associated with brakes associated with individual wheels of said vehicle; and a ESC program run on the electronic control unit that uses inputs from the sensors and information from the map database that indicates a property of the road upon which the vehicle is located to determine an output to the brake actuators to reduce a difference between an intended vehicle direction and an actual vehicle direction. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A method of operation for an electronic stability control system in a vehicle, the method comprising the steps of:
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determining a location of the vehicle along a road in a road network; accessing a map database to determine a property of the road at the location of the vehicle along the road; obtaining outputs from sensors in the vehicle that indicate an actual vehicle yaw rate and an intended vehicle yaw rate; and using the outputs from the sensors and the property of the road at the location of the vehicle to determine whether to provide an output to brake actuators to reduce a difference between the actual vehicle yaw rate and the intended vehicle yaw rate. - View Dependent Claims (31)
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32. A method of operation for an electronic stability control system in a vehicle, the method comprising the steps of:
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determining a location of the vehicle along a road in a road network; accessing a map database to determine a property of the road at the location of the vehicle along the road; obtaining outputs from sensors in the vehicle that indicate an actual vehicle yaw rate and an intended vehicle yaw rate; using the outputs from the sensors and the property of the road at the location of the vehicle to determine whether to provide an output to brake actuators to reduce a difference between the actual vehicle yaw rate and the intended vehicle yaw rate; and using the outputs from the sensors and the property of the road at the location of the vehicle to determine an appropriate output for brake actuators to reduce a difference between the actual vehicle yaw rate and the intended vehicle yaw rate.
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Specification