control unit

Abstract

Control unit for controlling a vehicle drive system, in which a first intervention device, an electric rotary machine, and a second intervention device are provided in an energy transmission path connecting an internal combustion engine to wheels, and are arranged sequentially from the internal combustion engine side, wherein During a start control that starts the internal combustion engine, the control unit brings the second engagement device into a slip engagement state and performs a slip control that controls the electric rotary machine to maintain a state in which there is a difference in rotational speed between a pair of engagement elements of the second engagement device. a rotational speed of the electric rotary machine, at which there is no difference in rotational speed between the pair of engagement elements of the second engagement device, is defined as a synchronous rotational speed, and The slip control maintains the rotational speed of the electric rotary machine at a rotational speed greater than the synchronous rotational speed when an accelerator control level decreases under a condition where the rotational speed of the electric rotary machine is greater than the synchronous rotational speed, wherein A control system that increases the rotational speed of the electric rotary machine above the synchronous rotational speed is defined as a positive slip control, and a control system that reduces the rotational speed of the electric rotary machine below the synchronous rotational speed is defined as a negative slip control. In the case of slip control, regarding whether a required torque, which is a torque that is needed to be transmitted to the wheels by means of the second intervention device, is positive or negative, positive slip control is carried out if the required torque is a positive torque, and negative slip control is carried out if the required torque is negative, and If the accelerator control level decreases under the condition where the rotational speed of the electric rotary machine is greater than the synchronous rotational speed, the negative slip control is prevented so that the rotational speed of the electric rotary machine is maintained at the rotational speed greater than the synchronous rotational speed.

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