A device for controlling fail-safe for a vehicle includes a driving device that engages a clutch and a brake individually in a stopped state of the vehicle when a shift by wire system fails, and a controller that locks the engaged clutch and brake, and unlocks the clutch and the brake when a predetermined unlock manipulation pattern is input using a brake pedal and an accelerator pedal of the vehicle.

Air ingestion into a transmission hydraulic system may lead to a number of issues. For example, the time to engage a hydraulically actuated parking mechanism may be excessive. As another example, the pump may not prime properly on a subsequent engine start. The air ingestion issue may be detected based on variability of transmission line pressure. When the line pressure variability exceeds a threshold, actions are taken to mitigate the potential issues.

Methods and systems are provided for entering into a parked state in a hybrid electric vehicle that includes a dual clutch transmission. In one example, a driveline operating method comprises in response to a first condition, engaging a first gear and engaging a second gear of a dual clutch transmission in response to a request to enter a vehicle park state where an output of a transmission is held from rotating, and in response to a second condition, engaging a third gear and engaging a fourth gear of a dual clutch transmission in response to a request to enter a vehicle park state. In this way, a park state may be entered into without the use of a park pawl, which may reduce costs associated with the vehicle and which may prevent issues associated with degradation of the park pawl.

A drive device for a PTO shaft includes a parking switch to detect a parking state of a vehicle body, a permission switch constituted of a self-returning switch and connected to the parking switch, the permission switch being configured to be switched to permit driving a PTO shaft, the PTO shaft being configured to be driven by a power of a prime mover disposed on the vehicle body, and a first switch device to be switched to enable the PTO shaft to be driven when the permission switch is switched to permit driving the PTO shaft under a state where the parking switch detects the parking state of the vehicle body.

A vehicle drive device includes a control portion that is allowed to execute a control mode that controls multiple hydraulic elements to cause a vehicle in a stop state of an engine to start moving. The control mode starts controlling part of the multiple hydraulic elements before the engine is started, by using oil pressure accumulated in an accumulator (S8). The control mode starts controlling the rest of the multiple hydraulic elements by using oil pressure that is provided after the engine is started (S16).

In a special operating mode, a controller is programmed to disengage a hydraulically actuated park mechanism without use of engine power. The starter motor is used to rotate the engine-driven pump at sufficient speed to command disengagement of Park. Once park is disengaged, a holding pin is used to maintain the out of park condition without hydraulic pressure or flow.

A drive device for a PTO shaft includes a parking switch to detect a parking state of a vehicle body, a permission switch constituted of a self-returning switch and connected to the parking switch, the permission switch being configured to be switched to permit driving a PTO shaft, the PTO shaft being configured to be driven by a power of a prime mover disposed on the vehicle body, and a first switch device to be switched to enable the PTO shaft to be driven when the permission switch is switched to permit driving the PTO shaft under a state where the parking switch detects the parking state of the vehicle body.

The invention concerns a method for operating a brake back-up system (8) of a motor vehicle (2), with the steps: (S100) Reading in operating data (BD) of the motor vehicle (2), (S200) Evaluating the read-in operating data (BD) to identify malfunctions of a braking system of the motor vehicle (2), and (S300) Providing at least one actuation signal (AS, AS) to influence components of a drive train of the motor vehicle (2).

Methods and systems are provided for controlling clutch capacity in a hybrid electric vehicle. In one example, a method includes adjusting values of a transfer function of a clutch of a dual clutch transmission in response to an operating condition of an engine and/or operating condition of an integrated starter/generator coupled to the engine while a vehicle is propelled via an electric machine coupled to the dual clutch transmission, and maintaining a driver demand wheel torque at vehicle wheels via adjusting torque of the electric machine in response to the operating condition of the engine and/or operating condition of the integrated starter generator. In this way the method may apply pressure to one of the clutches where engine speed is independently controlled to maintain positive or negative slip, thus enabling adaptation of positive and negative clutch transfer functions, which may improve driveline operation and shift quality.

A parking lock device includes a parking mechanism, a lock state switching member, a selector, a gradient detector, a switching controller, and an engine speed controller. The lock state switching member locks a parking gear when supply of hydraulic pressure is stopped. When hydraulic pressure is supplied, the lock state switching member releases the lock of the parking gear. The selector receives operation to select a shift range. The gradient detector detects a gradient of a road surface. When a parking range is selected, the switching controller stops supplying the hydraulic pressure to the lock state switching member. When another shift range is selected, the switching controller supplies the hydraulic pressure to the lock state switching member. When the parking range is selected and the gradient of the road surface is equal to or larger than a predetermined value, the engine speed controller increases an engine speed.