A vehicle control apparatus having an engine and an electric motor includes a clutch, a first travel controller, a second travel controller, and a motor controller. The clutch is disposed in a power transmission path that couples the engine and driving wheels to each other. The first travel controller executes a motor travel in which the driving wheels are driven by the electric motor in a state where the clutch is disengaged to decouple the engine from the driving wheels, and the engine is stopped. The second travel controller executes a cranking travel in which the clutch is engaged while a fuel injection of the engine is stopped in a state in which the motor travel is executed, and the engine is rotated during traveling. The motor controller increases an output torque of the electric motor when a travel mode switches from the motor travel to the cranking travel.

A transmission control device (4) includes: a gear ratio calculating unit (4a) for calculating a target gear ratio of a transmission (2) based on a gear ratio control mode, to thereby control the transmission; an electric motor drive torque calculating unit (4b) for calculating a drive torque of an electric motor (9) based on the gear ratio control mode when drive of the electric motor (9) is permitted; and an engine torque calculating unit (4c) for calculating an output torque of an engine (1) based on the gear ratio control mode so as to achieve a best fuel efficiency operation state. The gear ratio calculating unit (4a) switches processing of calculating a gear ratio based on whether or not the drive of the electric motor (9) is permitted.

A transmission control device (4) includes: a gear ratio calculating unit (4a) for calculating a target gear ratio of a transmission (2) based on a gear ratio control mode, to thereby control the transmission; an electric motor drive torque calculating unit (4b) for calculating a drive torque of an electric motor (9) based on the gear ratio control mode when drive of the electric motor (9) is permitted; and an engine torque calculating unit (4c) for calculating an output torque of an engine (1) based on the gear ratio control mode so as to achieve a best fuel efficiency operation state. The gear ratio calculating unit (4a) switches processing of calculating a gear ratio based on whether or not the drive of the electric motor (9) is permitted.

A control device for a continuously variable transmission includes first, second, and third controllers. The first controller controls, in response to a first speed control request for controlling a traveling speed of a vehicle for a predetermined state, a gear ratio of the continuously variable transmission such that a rotational speed of a drive power source approaches a set rotational speed. The second controller controls, in response to a second speed control request issued while the first controller is controlling the gear ratio, the gear ratio based on the rotational speed and the gear ratio. The third controller changes, when the rotational speed changes as a result of the second controller controlling the gear ratio, torque of the drive power source based on torque and the rotational speed of the drive power source before the gear ratio is changed and a target rotational speed of the drive power source.

A control device for a continuously variable transmission includes first, second, and third controllers. The first controller controls, in response to a first speed control request for controlling a traveling speed of a vehicle for a predetermined state, a gear ratio of the continuously variable transmission such that a rotational speed of a drive power source approaches a set rotational speed. The second controller controls, in response to a second speed control request issued while the first controller is controlling the gear ratio, the gear ratio based on the rotational speed and the gear ratio. The third controller changes, when the rotational speed changes as a result of the second controller controlling the gear ratio, torque of the drive power source based on torque and the rotational speed of the drive power source before the gear ratio is changed and a target rotational speed of the drive power source.

A method of operating a vehicle having an engine, a throttle valve and a throttle operator. A continuously variable transmission operatively connected to the engine has a driving pulley, a driven pulley, and a belt operatively connecting the driving and driven pulleys. A ground engaging member is operatively connected to the driven pulley. A piston is operatively connected to the driving pulley for applying a piston force thereto and thereby changing an effective diameter of the driving pulley. A control unit controls actuation of the piston and the piston force. The method includes detecting a stall condition indicative of the vehicle being stalled, and, responsive to the detection, setting the piston force to be zero.

A control device for an automatic transmission includes: a failure diagnosis section for diagnosing whether or not a failure has occurred in a shift control system of the automatic transmission; a fail-safe control section for fixing the automatic transmission into a predetermined gear position in response to confirmation of the failure of the shift control system of the automatic transmission; and an oil temperature rise regulation torque reduction control section for outputting a torque reduction request to suppress torque of a vehicle driving source, based on temperature of transmission operating oil of the automatic transmission, and outputting the torque reduction request in response to satisfaction of an oil temperature condition that is set lower in oil temperature when the automatic transmission is fixed in a first gear position by the fail-safe control section than when the automatic transmission is not fixed in the first gear position.

A control device for an automatic transmission includes: a failure diagnosis section for diagnosing whether or not a failure has occurred in a shift control system of the automatic transmission; a fail-safe control section for fixing the automatic transmission into a predetermined gear position in response to confirmation of the failure of the shift control system of the automatic transmission; and an oil temperature rise regulation torque reduction control section for outputting a torque reduction request to suppress torque of a vehicle driving source, based on temperature of transmission operating oil of the automatic transmission, and outputting the torque reduction request in response to satisfaction of an oil temperature condition that is set lower in oil temperature when the automatic transmission is fixed in a first gear position by the fail-safe control section than when the automatic transmission is not fixed in the first gear position.

A vehicle has an engine, a CVT and at least one ground engaging member. A method of controlling the engine includes the steps of: determining an idle speed set point based at least in part on a first speed proportional to a driven pulley speed, the idle speed set point being less than an engagement speed when the driven pulley speed is less than a predetermined driven pulley speed and being less than an actual engine speed when the driven pulley speed is greater than the predetermined driven pulley speed; and controlling the engine to operate under conditions corresponding to the idle speed set point when a desired engine speed is less than the idle speed set point. Controlling the engine to operate under conditions corresponding to the idle speed set point causes engine braking when the driven pulley speed is greater than the predetermined driven pulley speed.

A control device for a vehicle is provided. The vehicle includes an engine, an accessory, a continuously variable transmission, and a lock-up clutch. The control device includes an electronic control unit. The electronic control unit is configured to: when the load state is less than a predetermined value, control the speed ratio of the continuously variable transmission and the rotational speed of the engine such that the rotational speed of the engine during engagement of the lock-up clutch is kept at a first rotational speed; and when the load state is greater than or equal to the predetermined value, control the speed ratio of the continuously variable transmission and the rotational speed of the engine such that the rotational speed of the engine during engagement of the lockup clutch becomes a second rotational speed higher than the first rotational speed.