Provided is a method for controlling a waste heat recovery system associated with a powertrain of a vehicle, the powertrain comprising a combustion engine and a gearbox connected to the combustion engine, the waste heat recovery system comprising a working fluid circuit; an evaporator; an expander; a condenser; a reservoir for a working fluid and a pump arranged to pump the working fluid through the circuit, wherein the evaporator is arranged for heat exchange between the working fluid and at least one heat source, wherein the waste heat recovery system further comprises a cooling circuit arranged in connection to the condenser, and wherein the expander is mechanically connected to the powertrain. The method comprises the steps of: predicting a downhill slope which will require braking of the vehicle; reducing the temperature of the evaporator to a predetermined temperature; and turning off the pump and thus the waste heat recovery system.

A system and method for electric oil pump control of hybrid electric vehicle are provided. The system includes a driving information detector that is configured to detect driving information according to driving of the hybrid vehicle and an operation type transmission of an electric oil pump (EOP) that receives and supplies transmission oil for operating a clutch. A controller analyzes the driving information, and detects an oil skew phenomenon and enters the EOP speed increasing mode when the hybrid vehicle stops by rapid braking, and increases the EOP speed to increase temporary oil absorption power during rapid starting in a predetermined reference period of time.

When a brake is turned on during travel of a hybrid vehicle, a required braking force required for a drive shaft is set based on a brake depression amount, a base rotation speed of an engine is set based on the required braking force, a shift stage is set based on the base rotation speed and a vehicle speed, a target rotation speed of the engine is set based on the shift stage and the vehicle speed, and the engine, the first motor, and the second motor are controlled such that the engine operates at the target rotation speed and the required braking force acts on the drive shaft.

In an information providing method for a vehicle, an engine is stopped automatically when a predetermined permission condition is satisfied in a state in which the vehicle is stopped by a brake operation executed by a driver. The permission condition is a brake operation amount of a brake having reached a predetermined brake operation amount. The driver is notified of support information prompting the driver to increase the brake operation amount when the permission condition is not satisfied after a predetermined time has elapsed since the vehicle was stopped. A braking force capable of maintaining a vehicle stop state is generated by a vehicle stop keeping control. The driver is notified of the support information when the brake operation amount decreases before the predetermined time has elapsed in a state in which the vehicle has been stopped by the brake operation and the vehicle stop keeping control is executed.

Systems and methods for operating a driveline of a hybrid vehicle are disclosed. In one example, an engine may enter or stay in one of two cylinder modes in response to a request to a negative torque capacity of an electric machine being insufficient to provide a desired driveline braking torque. One cylinder mode operates cylinders with cylinder valves held closed and without fuel being injected to the cylinders while the other cylinder mode operates cylinders with valves that open and close without fuel being injected to the cylinders.

Methods for controlling vacuum within a brake booster by modifying powertrain operation include determining an intake manifold vacuum in response to actuation of a brake pedal. Increasing the intake manifold vacuum if the brake booster vacuum is less than a desired brake booster vacuum. In some embodiments, the transmission is downshifted to increase engine speed and intake manifold vacuum.

In an information providing method for a vehicle, an engine is stopped automatically when a predetermined permission condition is satisfied in a state in which the vehicle is stopped by a brake operation executed by a driver. The permission condition is a brake operation amount of a brake having reached a predetermined brake operation amount. The driver is notified of support information prompting the driver to increase the brake operation amount when the permission condition is not satisfied after a predetermined time has elapsed since the vehicle was stopped. A braking force capable of maintaining a vehicle stop state is generated by a vehicle stop keeping control. The driver is notified of the support information when the brake operation amount decreases before the predetermined time has elapsed in a state in which the vehicle has been stopped by the brake operation and the vehicle stop keeping control is executed.

A vehicle includes a trailer hitch, an axle having an electronic limited slip differential, and a controller. The electronic limited slip differential includes a variable torque capacity lockup clutch. The controller is programmed to, in response to detecting the presence of a trailer connected to the trailer hitch and an increase in vehicle speed, increase the lockup clutch torque by a first torque adjustment.

Systems and methods for operating a driveline of a hybrid vehicle are disclosed. In one example, an engine may enter or stay in one of two cylinder modes in response to a request to a negative torque capacity of an electric machine being insufficient to provide a desired driveline braking torque. One cylinder mode operates cylinders with cylinder valves held closed and without fuel being injected to the cylinders while the other cylinder mode operates cylinders with valves that open and close without fuel being injected to the cylinders.

A system and method for electric oil pump control of hybrid electric vehicle are provided. The system includes a driving information detector that is configured to detect driving information according to driving of the hybrid vehicle and an operation type transmission of an electric oil pump (EOP) that receives and supplies transmission oil for operating a clutch. A controller analyzes the driving information, and detects an oil skew phenomenon and enters the EOP speed increasing mode when the hybrid vehicle stops by rapid braking, and increases the EOP speed to increase temporary oil absorption power during rapid starting in a predetermined reference period of time.