Video enhanced stability control in road vehicles
First Claim
Patent Images
1. A stability control system for road vehicles comprising:
- a video image processing system; and
a limit handling assistance controller connected to said video image processing system and which uses video lane detection measurements in conjunction with vehicle dynamics information, including inertial brakes and steering measurements, to control vehicle Electronic Power Steering (EPS) and Vehicle Stability Control (VSC) systems to assist the driver to stabilise the vehicle and correct for any lane offset both prior to and during at least one of the conditions of understeer, oversteer, split-μ and
heavy breaking conditions, and lane changes, said limit handling assistance controller including;
a scenario control which receives vehicle measurements and Human Machine Interface (HMI) inputs and estimates therefrom the dynamic state of the vehicle, such as understeer/oversteer/heavy braking, and the intentions of the driver, such as lane change, whereby to provide a series of scenario flags for use in informing the controller of what vehicle control action is available;
a position and yaw rate control which receives vehicle measurement data and lane detection data and calculates one of a yaw rate required to return the vehicle to the centre of its lane and a yaw rate required for lane transition if a lane change flag is detected; and
a steering and braking control which receives said calculated yaw rate and the vehicle measurement data and is operative to calculate steering and braking demands for transfer to the vehicle EPS and VSC systems.
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Abstract
A stability control system for road vehicles comprising a limit handling assistance controller which uses video lane detection measurements in conjunction with vehicle dynamics information, including inertial brakes and steering measurements to control vehicle EPS and VSC systems to assist the driver stabilize the vehicle and correct for any lane offset prior to and/or during of understeer, oversteer, split-μ and heavy breaking conditions, and lane changes.
44 Citations
15 Claims
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1. A stability control system for road vehicles comprising:
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a video image processing system; and a limit handling assistance controller connected to said video image processing system and which uses video lane detection measurements in conjunction with vehicle dynamics information, including inertial brakes and steering measurements, to control vehicle Electronic Power Steering (EPS) and Vehicle Stability Control (VSC) systems to assist the driver to stabilise the vehicle and correct for any lane offset both prior to and during at least one of the conditions of understeer, oversteer, split-μ and
heavy breaking conditions, and lane changes, said limit handling assistance controller including;a scenario control which receives vehicle measurements and Human Machine Interface (HMI) inputs and estimates therefrom the dynamic state of the vehicle, such as understeer/oversteer/heavy braking, and the intentions of the driver, such as lane change, whereby to provide a series of scenario flags for use in informing the controller of what vehicle control action is available; a position and yaw rate control which receives vehicle measurement data and lane detection data and calculates one of a yaw rate required to return the vehicle to the centre of its lane and a yaw rate required for lane transition if a lane change flag is detected; and a steering and braking control which receives said calculated yaw rate and the vehicle measurement data and is operative to calculate steering and braking demands for transfer to the vehicle EPS and VSC systems. - View Dependent Claims (2)
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3. A stability control system for road vehicles comprising:
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a video image processing system; a limit handling assistance controller connected to said video image processing system and which uses video lane detection measurements in conjunction with vehicle dynamics information, including inertial brakes and steering measurements, to control vehicle Electronic Power Steering (EPS) and Vehicle Stability Control (VSC) systems to assist the driver to stabilise the vehicle and correct for any lane offset both prior to and during at least one of the conditions of understeer, oversteer, split-μ and
heavy breaking conditions, and lane changes, said limit handling assistance controller including;a scenario control which receives vehicle measurements and Human Machine Interface (HMI) inputs and estimates therefrom the dynamic state of the vehicle, such as understeer/oversteer/heavy braking, and the intentions of the driver, such as lane change, whereby to provide a series of scenario flags for use in informing the controller of what vehicle control action is available; a position and yaw rate control which receives vehicle measurement data and line detection data and calculates one of a yaw rate required to return the vehicle to the centre of its lane and a yaw rate required for lane transition if a lane change flag is detected; and a steering and braking control which receives said calculated yaw rate and the vehicle measurement data and is operative to calculate steering and braking demands for transfer to the vehicle EPS and VSC systems, said steering and braking control including; a steering and braking yaw demand allocator, a steering demand control, and a braking demand control, with said steering and braking yaw demand allocator proportioning said calculated yaw rate demanded by said position and yaw rate control to said steering demand control and said braking demand control according to said scenario flags, said steering demand control being operative to generate a steering demand and said braking demand control being operative to generate a braking demand; and an application control device coupled to a mode control and acting as a mode switch for connecting the steering and braking demands produced by said steering demand control and said braking demand control to the vehicles EPS and VSC systems when said mode control indicates that the system is active. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A stability control system for road vehicles having an Active Torque Overlay (ATO) system and comprising a limit handling assistance controller which uses video lane detection measurements in conjunction with vehicle dynamics information, including inertial brakes and steering measurements to control the ATO system to assist the driver in stabilizing the vehicle and correcting for any lane offset prior to and during at least one of the conditions of understeer, oversteer, split-μ
- and heavy braking conditions, and lane changes.
Specification