Hands on steering wheel detect

• US 10,029,676 B2
• Filed: 01/29/2015
• Issued: 07/24/2018
• Est. Priority Date: 01/29/2014
• Status: Active Grant

• Current Assignee: Steering Solutions IP Holding Corporation (Nexteer Automotive Group Ltd.)
• Original Assignee: Steering Solutions IP Holding Corporation (Nexteer Automotive Group Ltd.)
• Inventors: Kaufmann, Timothy W., Fuesz, Daniel W., Hales, Michael K.
• Primary Examiner(s): Smith, Jelani A
• Assistant Examiner(s): Alsomiri, Majdi A
• Application Number:
  US14/608,375
• Publication Number:
  US 20150210273A1
• Time in Patent Office: 1,272 Days
• Field of Search: 701 1, 701 304, 701 47
• CPC Class Codes: B60W 30/00 Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
• CPC Class Codes: B60W 30/02 Control of vehicle driving stability
• CPC Class Codes: B60W 40/08 related to drivers or passengers
• CPC Class Codes: B62D 1/286 Systems for interrupting non-mechanical steering due to driver intervention
• CPC Class Codes: B62D 5/0463 calculating assisting torque from the motor based on driver input
• CPC Class Codes: B62D 5/0466 for returning the steering wheel to neutral position
• CPC Class Codes: B62D 6/007 adjustable by the driver, e.g. sport mode
• CPC Class Codes: B62D 6/008 Control of feed-back to the steering input member, e.g. simulating road feel in steer-by-wire applications
• CPC Class Codes: B62D 6/04 responsive only to forces disturbing the intended course of the vehicle, e.g. forces acting transversely to the direction of vehicle travel
• CPC Class Codes: B62D 6/10 characterised by means for sensing or determining torque

Abstract

A method for determining whether hands of an operator of a vehicle are positioned on a hand wheel of the vehicle is provided. The method generates a first frequency content below a first frequency from a hand wheel torque signal. The method generates a second frequency content above a second frequency from the hand wheel torque signal. The method generates a hands on wheel (HOW) estimate signal based on the first frequency content and the second frequency content. The method causes a system in a vehicle to operate based on the HOW estimate signal.

Claims

1. A method for determining whether hands of an operator of a vehicle are positioned on a hand wheel of the vehicle, comprising:

generating, by a control module, a first frequency content below a first frequency from a hand wheel torque signal received by the control module from a hand wheel torque sensor;

generating, by the control module, a second frequency content above a second frequency from the first frequency content of the hand wheel torque signal;

generating, by the control module, a hands on wheel (HOW) estimate signal based on a first frequency weighting applied to the first frequency content and summed with a second frequency weighting applied to the second frequency content, and limiting a rate of change of the HOW estimate signal; and

causing, by the control module, a system of the vehicle to operate based on the HOW estimate signal.

2. The method of claim 1, wherein the generating the first frequency content comprises using a plurality of cascaded low pass filters with the first frequency as a cutoff frequency.

3. The method of claim 1, wherein the generating the second frequency content comprises using a high pass filter with the second frequency as a cutoff frequency.

4. The method of claim 1, wherein the generating the HOW estimate signal comprises:

determining a first contribution of the first frequency content to the HOW estimate signal;

determining a second contribution of the second frequency content to the HOW estimate signal; and

combining the first contribution and the second contribution to generate the HOW estimate signal.

5. The method of claim 1, wherein the generating the HOW estimate signal comprises limiting the HOW estimate signal to a range of values.

6. The method of claim 1, further comprising generating a HOW state signal from the HOW estimate signal.

7. The method of claim 6, wherein the generating the HOW state signal comprises setting the HOW state signal to a discrete value in response to determining that the HOW estimate signal stays above a predetermined threshold value for longer than a threshold duration of time.

8. The method of claim 6, wherein the causing the system to operate comprises causing the system to operate further based on the HOW state signal.

9. The method of claim 1, wherein the system comprises at least one of advanced driver assistance systems (ADAS), electronic stability control (ESC) system, and an alerting system that notifies the operator of the vehicle to take control of the hand wheel.

10. A control system, comprising:

a hand wheel torque sensor configured to generate a hand wheel torque signal based on a movement of a hand wheel of a vehicle; and

a control module for determining whether hands of an operator of the vehicle are positioned on a hand wheel of the vehicle, the control module configured to;

generate a first frequency content below a first frequency from a hand wheel torque signal;

generate a second frequency content above a second frequency from the first frequency content of the hand wheel torque signal;

generate a hands on wheel (HOW) estimate signal based on a first frequency weighting applied to the first frequency content and summed with a second frequency weighting applied to the second frequency content, and limit a rate of change of the HOW estimate signal; and

cause a system of the vehicle to operate based on the HOW estimate signal.

11. The control system of claim 10, wherein the control module is configured to generate the first frequency content by using a plurality of cascaded low pass filters with the first frequency as a cutoff frequency.

12. The control system of claim 10, wherein the control module is configured to generate the second frequency content by using a high pass filter with the second frequency as a cutoff frequency.

13. The control system of claim 10, wherein the control module is configured to generate the HOW estimate signal by:

determining a first contribution of the first frequency content to the HOW estimate signal;

determining a second contribution of the second frequency content to the HOW estimate signal; and

combining the first contribution and the second contribution to generate the HOW estimate signal.

14. The control system of claim 10, wherein the control module is configured to generate the HOW estimate signal by limiting the HOW estimate signal to a range of values.

15. The control system of claim 10, wherein the control module is further configured to generate a HOW state signal from the HOW estimate signal.

16. The control system of claim 15, wherein the control module is configured to generate the HOW state signal by setting the HOW state signal to a discrete value in response to determining that the HOW estimate signal stays above a predetermined threshold value for longer than a threshold duration of time.

17. The control system of claim 15, wherein the control module is configured to cause the system to operate further based on the HOW state signal.

18. The control system of claim 10, wherein the system comprises at least one of advanced driver assistance systems (ADAS), electronic stability control (ESC) system, and an alerting system that notifies the operator of the vehicle to take control of the hand wheel.