Onboard diagnostics of an active air dam assembly
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B62D-035/00
B62D-035/02
H02P-006/16
출원번호
US-0378204
(2016-12-14)
등록번호
US-10081400
(2018-09-25)
발명자
/ 주소
Abdoul Azizou, Abdoul Karim
Suntharalingam, Piranavan
출원인 / 주소
GM Global Technology Operations LLC
대리인 / 주소
Quinn IP Law
인용정보
피인용 횟수 :
0인용 특허 :
11
초록▼
A vehicle includes a body and an active air dam assembly. The body has a first end facing an ambient airflow and a second end facing away from the ambient airflow. The assembly is disposed at the first or second end and controls the ambient airflow between the body and a road surface. The assembly i
A vehicle includes a body and an active air dam assembly. The body has a first end facing an ambient airflow and a second end facing away from the ambient airflow. The assembly is disposed at the first or second end and controls the ambient airflow between the body and a road surface. The assembly includes an adjustable flap, an actuator, sensors, and a controller. The flap shifts between different stowed and deployed positions. The actuator moves the flap, e.g., via a shaft. Each sensor measures a separate performance parameter of the actuator. The controller executes a method to receive the measured performance parameters, identify a fault mode of the air dam assembly from among different possible fault modes using the performance parameters, and execute a control action corresponding to the identified fault mode.
대표청구항▼
1. A vehicle comprising: a vehicle body; andan active air dam assembly coupled to the vehicle body and configured to control an ambient airflow between the vehicle body and a road surface, the active air dam assembly including: an adjustable flap;a flap actuator configured to move the adjustable fla
1. A vehicle comprising: a vehicle body; andan active air dam assembly coupled to the vehicle body and configured to control an ambient airflow between the vehicle body and a road surface, the active air dam assembly including: an adjustable flap;a flap actuator configured to move the adjustable flap via the shaft anywhere between and inclusive of a stowed position having a first height relative to the road surface and a deployed position having a second height relative to the road surface, wherein the first height is greater than the second height;a plurality of sensors, each of which is operable for measuring a separate performance parameter of the flap actuator; anda controller configured to receive the measured performance parameters from the plurality of sensors, identify a fault mode of the active air dam assembly from among a plurality of different possible fault modes using the received performance parameters, and execute a control action corresponding to the identified fault mode. 2. The vehicle of claim 1, wherein the flap actuator is a motor. 3. The vehicle of claim 2, wherein the motor is a brushless direct current motor. 4. The vehicle of claim 1, wherein the fault modes include a first fault mode indicative of a fault or malfunction of the adjustable flap, a second fault mode indicative of a fault or malfunction of the flap actuator, and a third fault mode indicative of a fault or malfunction of one of the plurality of sensors. 5. The vehicle of claim 4, wherein the plurality of electrical sensors includes a current sensor operable for measuring a current draw of the flap actuator, a voltage sensor operable for measuring a back-electromotive force of the flap actuator, and a position sensor operable for measuring a relative position of the flap actuator, and wherein the third fault mode is indicative of a fault or malfunction of the position sensor. 6. The vehicle of claim 5, wherein the control action corresponding to the identified fault mode includes registering or recording of a diagnostic code in memory of the controller to indicate the identified fault mode. 7. An active air dam assembly for controlling an ambient airflow between a vehicle body and a road surface, the active air dam assembly comprising: an adjustable flap;a shaft coupled to the adjustable flap and configured to shift the adjustable flap between a stowed position having a first height relative to the road surface and a deployed position having a second height relative to the road surface, wherein the first height is greater than the second height;a flap actuator coupled to the shaft and configured to move the adjustable flap via the shaft anywhere between and inclusive of the stowed position and the deployed position;a plurality of sensors, each of which is operable for measuring a separate performance parameter of the flap actuator; anda controller configured to receive the measured performance parameters from the sensors, identify a fault mode of the active air dam assembly from among a plurality of different fault modes using the received performance parameters, and execute a control action corresponding to the identified fault mode. 8. The active air dam assembly of claim 7, wherein the flap actuator is a motor. 9. The active air dam assembly of claim 8, wherein the motor is a brushless direct current motor. 10. The assembly of claim 7, wherein the fault modes include a first fault mode indicative of a fault or malfunction of the adjustable flap, a second fault indicative of a fault or malfunction of the flap actuator, and a third fault indicative of a fault or malfunction of one of the plurality of sensors. 11. The active air dam assembly of claim 10, wherein the plurality of sensors includes a current sensor operable for measuring a current draw of the flap actuator, a voltage sensor operable for measuring a back-electromotive force of the flap actuator, and a position sensor operable for measuring a relative position of the flap actuator or the adjustable flap, and wherein the third fault mode is indicative of a fault mode of the position sensor. 12. The active air dam assembly of claim 11, wherein the control action corresponding to the identified fault mode includes recording a diagnostic code indicative of the identified fault mode. 13. A method for diagnosing performance of an active air dam assembly in a vehicle having a vehicle body, wherein the active air dam assembly includes a flap having a position that is adjustable anywhere between and inclusive of a stowed position having a first height relative to the road surface and a deployed position having a second height relative to the road surface, wherein the first height is greater than the second height, and a flap actuator configured to move the flap between the stowed and deployed positions to control an ambient airflow between the vehicle body and a road surface, the method comprising: measuring a set of performance parameters of the flap actuator using a plurality of sensors;identifying a fault mode of the active air dam assembly from among a plurality of different possible fault modes using the measured performance parameters to thereby diagnose the performance of the active air dam assembly; andexecuting a control action corresponding to the identified fault mode. 14. The method of claim 13, wherein the flap actuator is a motor. 15. The method of claim 14, wherein the motor is a brushless direct current motor. 16. The method of claim 13, wherein identifying a fault mode includes identifying a first fault mode indicative of a fault or malfunction of the adjustable flap, a second fault mode indicative of a fault or malfunction of the flap actuator, and a third fault mode indicative of a fault or malfunction of one of the plurality of sensors. 17. The method of claim 16, wherein measuring a set of performance parameters includes measuring a current draw of the flap actuator via a current sensor, measuring a back-electromotive force of the flap actuator via a voltage sensor, and measuring a relative position of the flap actuator via a position sensor. 18. The method of claim 17, further comprising: calculating a load or torque variation of the flap actuator using the measured current draw; andcomparing the calculated load or torque variation of the flap actuator to an expected load or torque variation of the flap. 19. The method of claim 17, wherein measuring the back-EMF of the actuator includes discontinuing a pulse width modulation (PWM) signal to the flap actuator, detecting a voltage spike in the PWM signal after discontinuing the PWM signal, and then measuring the back-EMF via a voltage sensor only after detecting the voltage spike. 20. The method of claim 13, wherein executing the control action includes recording a diagnostic code indicative of the identified fault mode.
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