Steer torque manager for an advanced driver assistance system of a road vehicle
First Claim
1. A steer torque manager for an advanced driver assistance system of a road vehicle having an electrical power assisted steering system, the steer torque manager comprising:
- a driver-in-the-loop functionality for determining when and how to hand over control from the advanced driver assistance system to a driver; and
a wheel angle controller for providing, from an advanced driver assistance system wheel angle request, an overlay torque request to be added to a torque request from the electrical power assisted steering;
wherein the steer torque manager is configured to receive an assistance torque related signal and, when driver assistance is provided by the advanced driver assistance system, to feed forward and subtract from the overlay torque request provided by the wheel angle controller a feed forward signal scaled in a feed forward functionality to be a scaled version of the assistance torque related signal using a scale factor in the range from 0 to 1, the scale factor assuming a lower value in response to a measure of driver activity indicating a high driver activity and assuming a higher value in response to the measure of driver activity indicating a low driver activity that is less than the high driver activity;
wherein the steer torque manager is further configured to calculate the driver-in-the-loop factor as a normalized version of a driver-in-the-loop impulse, which it is arranged to calculate as a measure of driver activity over a time window where more recent values are weighted higher than older values, wherein the driver-in-the loop factor spans between indicating an inactive driver and a fully active driver.
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Accused Products
Abstract
A steer torque manager (STM) for an advanced driver assistance system (ADAS) of a road vehicle and a method therefor. A driver in the loop functionality determines when to hand over control to a driver. A wheel angle controller uses an ADAS wheel angle request to produce an overlay torque request to be added to a torque request from an electrical power assisted steering. The STM is arranged to receive an assistance torque related signal. When driver assistance is provided by the ADAS, the STM is arranged to feed forward and subtract from the overlay torque request a feed forward signal scaled to be a scaled version of the assistance torque related signal, using a scale factor in the range from 0 to 1 that assumes a lower value if a measure of driver activity indicates high driver activity and a higher value if the measure indicates low driver activity.
55 Citations
12 Claims
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1. A steer torque manager for an advanced driver assistance system of a road vehicle having an electrical power assisted steering system, the steer torque manager comprising:
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a driver-in-the-loop functionality for determining when and how to hand over control from the advanced driver assistance system to a driver; and a wheel angle controller for providing, from an advanced driver assistance system wheel angle request, an overlay torque request to be added to a torque request from the electrical power assisted steering; wherein the steer torque manager is configured to receive an assistance torque related signal and, when driver assistance is provided by the advanced driver assistance system, to feed forward and subtract from the overlay torque request provided by the wheel angle controller a feed forward signal scaled in a feed forward functionality to be a scaled version of the assistance torque related signal using a scale factor in the range from 0 to 1, the scale factor assuming a lower value in response to a measure of driver activity indicating a high driver activity and assuming a higher value in response to the measure of driver activity indicating a low driver activity that is less than the high driver activity; wherein the steer torque manager is further configured to calculate the driver-in-the-loop factor as a normalized version of a driver-in-the-loop impulse, which it is arranged to calculate as a measure of driver activity over a time window where more recent values are weighted higher than older values, wherein the driver-in-the loop factor spans between indicating an inactive driver and a fully active driver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for a steer torque manager for an advanced driver assistance system of a road vehicle having an electrical power assisted steering system, the steer torque manager comprising a driver-in-the-loop functionality for determining when and how to hand over control from an advanced driver assistance system to a driver, and a wheel angle controller for providing, from an advanced driver assistance system wheel angle request, an overlay torque request to be added to a torque request from the electrical power assisted steering, wherein the steer torque manager is configured to receive an assistance torque related signal, the method comprising:
in response to driver assistance provided by the advanced driver assistance system, having the steer torque manager feed forward and subtract from the overlay torque request provided by the wheel angle controller a feed forward signal scaled to be a scaled version of the assistance torque related signal, using a scale factor in the range from 0 to 1, the scale factor assuming a lower value in response to a measure of driver activity indicating a high driver activity and assuming a higher value in response to the measure of driver activity indicating a low driver activity that is less than the high driver activity, wherein the steer torque manager is further configured to calculate the driver-in-the-loop factor as a normalized version of a driver-in-the-loop impulse, which it is arranged to calculate as a measure of driver a activity over a time window where more recent values are weighted higher than older values, wherein the driver-in-the loop factor spans between indicating an inactive driver and a fully active driver.
Specification