Control device for all-wheel-drive vehicle

A control device for an all-wheel-drive vehicle including a transfer clutch configured to adjust a driving force transferred from an automatic transmission to a driven-wheel-side driveline, the control device comprising:

• a steering angle detector configured to detect a steering angle of a steering wheel;
• an accelerator pedal opening detector configured to detect an opening of an accelerator pedal;
• a vehicle speed detector configured to detect a vehicle speed;
• an engine revolution speed detector configured to detect an engine revolution speed;
• a turbine revolution speed detector configured to detect a turbine revolution speed of a torque converter;
• and
• a controller configured to perform adjustment to make the engine revolution speed greater than the turbine revolution speed in a case where third conditions that a predetermined period has passed from the opening of the accelerator pedal becoming less than a predetermined opening, the vehicle speed is within a predetermined speed range, a deviation between the engine revolution speed and the turbine revolution speed is less than a predetermined revolution speed, and the steering angle of the steering wheel is greater than or equal to a first predetermined angle are met.

A control device for an all-wheel-drive vehicle, the control device comprising:

• a transfer clutch configured to adjust a driving force transferred from an automatic transmission to a driven-wheel-side driveline;
• a steering angle detector configured to detect a steering angle of a steering wheel;
• an accelerator pedal opening detector configured to detect an opening of an accelerator pedal;
• a vehicle speed detector configured to detect a vehicle speed;
• an engine revolution speed detector configured to detect an engine revolution speed;
• a turbine revolution speed detector configured to detect a turbine revolution speed of a torque converter;
• and
• circuitry configured to
• adjust hydraulic pressure supplied to the transfer clutch by driving an electromagnetic valve on a basis of a vehicle operation state and control a coupling force of the transfer clutch,
• control the hydraulic pressure to reduce the coupling force of the transfer clutch compared with a coupling force in a case where at least one of first conditions is not met in a case where the first conditions that a predetermined period has passed from the opening of the accelerator pedal becoming less than a predetermined opening, the vehicle speed is within a predetermined speed range, a deviation between the engine revolution speed and the turbine revolution speed is less than a predetermined revolution speed, and the steering angle of the steering wheel is greater than or equal to a first predetermined angle are met, and
• adjust the engine revolution speed to be greater than the turbine revolution speed in a case where second conditions that the predetermined period has passed from the opening of the accelerator pedal becoming less than the predetermined opening, the vehicle speed is within the predetermined speed range, the deviation between the engine revolution steed and the turbine revolution speed is less than the predetermined revolution speed, and the steering angle of the steering wheel is greater than or equal to a second predetermined angle that is greater than the first predetermined angle are met.

A control device for an all-wheel-drive vehicle including a transfer clutch configured to adjust a driving force transferred from an automatic transmission to a driven-wheel-side driveline, the control device comprising:

• a steering angle detector configured to detect a steering angle of a steering wheel;
• an accelerator pedal opening detector configured to detect an opening of an accelerator pedal;
• a vehicle speed detector configured to detect a vehicle speed;
• an engine revolution speed detector configured to detect an engine revolution speed;
• a turbine revolution speed detector configured to detect a turbine revolution speed of a torque converter;
• and
• circuitry configured to perform adjustment to make the engine revolution speed greater than the turbine revolution speed in a case where conditions that a predetermined period has passed from the opening of the accelerator pedal becoming less than a predetermined opening, the vehicle speed is within a predetermined speed range, a deviation between the engine revolution speed and the turbine revolution speed is less than a predetermined revolution speed, and the steering angle of the steering wheel is greater than or equal to a first predetermined angle are met.

A control device for an all-wheel-drive vehicle, the control device comprising:

• a transfer clutch configured to adjust a driving force transferred from an automatic transmission to a driven-wheel-side driveline;
• a steering angle detector configured to detect a steering angle of a steering Wheel;
• an accelerator pedal opening detector configured to detect an opening of an accelerator pedal;
• a vehicle speed detector configured to detect a vehicle speed;
• an engine revolution speed detector configured to detect an engine revolution speed;
• a turbine revolution speed detector configured to detect a turbine revolution speed of a torque converter;
• and
• a transfer clutch controller configured to adjust hydraulic pressure supplied to the transfer clutch by driving an electromagnetic valve on a basis of a vehicle operation state and control a coupling force of the transfer clutch,
• wherein in a case Where first conditions that a predetermined period has passed from the opening of the accelerator pedal becoming less than a predetermined opening, the vehicle speed is within a predetermined speed range, a deviation between the engine revolution speed and the turbine revolution speed is less than a predetermined revolution speed, and the steering angle of the steering wheel is greater than or equal to a first predetermined angle are met, the transfer clutch controller controls the hydraulic pressure to reduce the coupling force of the transfer clutch compared with a coupling force in a case where at least one of the first conditions is not met, and then, when finishing a process of controlling the hydraulic pressure to reduce the coupling force of the transfer clutch, the transfer clutch controller increases a returning amount of the hydraulic pressure supplied to the transfer clutch per unit time as the opening of the accelerator pedal increases.

A control device for an all-wheel-drive vehicle, the control device comprising:

• a transfer clutch configured to adjust a driving force transferred from an automatic transmission to a driven-wheel-side driveline;
• a steering angle detector configured to detect a steering angle of a steering wheel;
• an accelerator pedal opening detector configured to detect an opening of an accelerator pedal;
• a vehicle speed detector configured to detect a vehicle speed;
• an engine revolution speed detector configured to detect an engine revolution speed;
• a turbine revolution speed detector configured to detect a turbine revolution speed of a torque converter;
• and
• a transfer clutch controller configured to adjust hydraulic pressure supplied to the transfer clutch by driving an electromagnetic valve on a basis of a vehicle operation state and control a coupling force of the transfer clutch, wherein
• in a case where first conditions that a predetermined period has passed from the opening of the accelerator pedal becoming less than a predetermined opening, the vehicle speed is within a predetermined speed range, a deviation between the engine revolution speed and the turbine revolution speed is less than a predetermined revolution speed, and the steering angle of the steering wheel is greater than or equal to a first predetermined angle are met, the transfer clutch controller controls the hydraulic pressure to reduce the coupling force of the transfer clutch compared with a coupling force in a case where at least one of the first conditions is not met, and the predetermined period is set to be longer as the vehicle speed increases.