US 12,403,776 B2
Control device for electric vehicle
Hirofumi Ebisumoto, Aki-gun (JP); Tomohiro Yoshizue, Aki-gun (JP); and Tsukasa Sori, Aki-gun (JP)
Assigned to Mazda Motor Corporation, Hiroshima (JP)
Filed by Mazda Motor Corporation, Hiroshima (JP)
Filed on Mar. 23, 2023, as Appl. No. 18/188,728.
Claims priority of application No. 2022-062954 (JP), filed on Apr. 5, 2022.
Prior Publication US 2023/0311672 A1, Oct. 5, 2023
Int. Cl. B60W 10/02 (2006.01); B60L 15/20 (2006.01); B60W 10/08 (2006.01); B60W 30/18 (2012.01); B60W 30/182 (2020.01)
CPC B60L 15/2054 (2013.01) [B60W 10/02 (2013.01); B60W 10/08 (2013.01); B60W 30/18172 (2013.01); B60W 30/182 (2013.01); B60W 2720/26 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A control device for an electric vehicle including a drive motor of which magnetic poles of a rotor are comprised of variable magnetism magnets that are able to change magnetism, and a clutch disposed between the drive motor and driving wheels, the electric vehicle being travelable using electric power, the control device being configured to:
when the electric vehicle travels, perform a torque control in which a motor torque outputted from the drive motor is controlled so that the motor torque coincides with a demanded torque demanded to be outputted to the driving wheels, and a first clutch control in which an engaging torque of the clutch is controlled to be higher than the demanded torque; and
when performing a magnetization control in which the magnetism of the variable magnetism magnets is changed to magnetize the variable magnetism magnets when the electric vehicle travels:
change a clutch control from the first clutch control to a second clutch control in which the engaging torque is made to coincide with the demanded torque, before the execution of the magnetization control; and
add a given slip torque to the demanded torque based on a coefficient of dynamic friction and a coefficient of static friction of the clutch to start a micro slip control in which the clutch is transitioned from an engaged state into a micro slip state.