Methods and systems are provided for using compression heating to heat a cylinder piston before cylinder combustion is resumed. Cylinder heating is achieved using combinations of slow unfueled engine rotation where the engine cylinders are heated via compression stroke heating, and slow compressor rotation where the cylinders are heated via compression heating. One or more intake or exhaust heaters may be concurrently operated to expedite cylinder heating.

When a starting point water temperature Twst is equal to or lower than a threshold value Twref1, catalyst warm-up control is executed, and when a cooling water temperature Tw becomes higher than the threshold value Twref1 or an operation time top of an engine becomes equal to or higher than a threshold value topref1, the control of the engine is shifted from the catalyst warm-up control to normal control. When the starting point water temperature Twst is higher than the threshold value Twref1 and is equal to or lower than a threshold value Twref2, PN suppression control is executed, and when the cooling water temperature Tw of the engine becomes higher than the threshold value Twref2 or the operation time top of the engine becomes equal to or higher than a threshold value topref2, the control of the engine is shifted from the PN suppression control to the normal control.

A method for regulating a temperature in an exhaust stream in a motor vehicle through control of its driveline. The motor vehicle includes a driveline having a combustion engine connected to a gearbox via a clutch device. The gearbox has several discrete gears. The driveline includes an exhaust system configured for the removal of an exhaust stream from the combustion engine. The method steps are: obtaining one or several first parameters P.sub.1, wherein at least one of first parameters P.sub.1 is a first temperature difference between a first temperature T.sub.1 in the exhaust system and a reference temperature T.sub.Ref; and controlling the gearbox, and thus controlling an operating point in the combustion engine, through downshift to a lower gear, and thus increasing engine speed and reducing a load on the combustion engine, if a value of the one or several first parameters P.sub.1 exceeds a first threshold, and an upshift to a higher gear, and thus reducing an engine speed and an increase of a load on the combustion engine, if a value for the one or several first parameters P.sub.1 is below a second threshold value. Further, a computer program, a computer program product, a system and a motor vehicle comprising such a system are disclosed.

Methods and systems are provided for controlling a vehicle engine to adjust exhaust warm-up strategy based on a vehicle network information. In one example, in response to an expected decrease in temperature of a catalyst of a vehicle below a threshold and an estimated duration thereof based on communications external from the vehicle, a method may include delaying catalyst heating actions, when the catalyst heating actions are determined to be unable to heat up the catalyst to threshold temperatures. However, the catalyst heating actions may be enabled when the catalyst heating actions are determined to be able to achieve the threshold temperature within the duration.

A controller of a hybrid vehicle is configured to operate the internal combustion engine with ignition timing of the internal combustion engine during the execution of the first warm-up control for operating the internal combustion engine at a first operating point further on a retard side than ignition timing of the internal combustion engine during the execution of the second warm-up control for operating the internal combustion engine at a second operating point, regardless of the driving force required for traveling after the execution of the first warm up control. The controller is configured to set the output of the internal combustion engine and the operation characteristic of the intake valve in accordance with a predetermined characteristic relationship in which the output of the internal combustion engine and the operation characteristic of the intake valve correspond to each other during the execution of the second warm-up control.

A hybrid vehicle includes an input device that is used by a user to request an increase in the amount of charge of the power storage device. When a request for increasing the amount of charge is made using the input device, a control device controls charging of a power storage device by a generating device so that charging of the power storage device is promoted, warms a catalyst device by operating an internal combustion engine while limiting the output of the internal combustion engine, and when the warming of the catalyst device and the request for increasing the amount of charge that is made using the input device overlap each other, the control device eases the output limitation of the internal combustion engine.

When a starting point water temperature Twst is equal to or lower than a threshold value Twref1, catalyst warm-up control is executed, and when a cooling water temperature Tw becomes higher than the threshold value Twref1 or an operation time top of an engine becomes equal to or higher than a threshold value topref1, the control of the engine is shifted from the catalyst warm-up control to normal control. When the starting point water temperature Twst is higher than the threshold value Twref1 and is equal to or lower than a threshold value Twref2, PN suppression control is executed, and when the cooling water temperature Tw of the engine becomes higher than the threshold value Twref2 or the operation time top of the engine becomes equal to or higher than a threshold value topref2, the control of the engine is shifted from the PN suppression control to the normal control.

In a controller and a control method for a power converter of a vehicle, the power converter has a first operation mode and a second operation mode defining power supply modes of first and second DC power supplies with respect to a load. The first operation mode is an operation mode set when the first and second DC power supplies are electrically connected in series to an electric wire electrically connected to the load. The second operation mode is an operation mode set when the first and second DC power supplies are electrically connected in parallel to the electric wire. The controller includes an electronic control unit. The electronic control unit is configured to execute warm-up promotion control of a catalytic device. The electronic control unit is configured to set the operation mode of the power converter to the second operation mode when executing the warm-up promotion control.

A hybrid vehicle includes an internal combustion engine, an electrical storage device, an electric motor, an exhaust emission control device, and a controller. The internal combustion engine includes a variable valve actuating device. The variable valve actuating device is configured to change an operation characteristic (IN1a, IN2a, IN3a) of an intake valve. The electrical storage device is configured to store electric power. The electric power is generated by using the internal combustion engine. The electric motor is configured to generate a driving force of the hybrid vehicle by using the electric power stored in the electrical storage device. The exhaust emission control device is configured to purify exhaust gas from the internal combustion engine with the use of a catalyst. The controller is configured to execute catalyst warm-up control. The catalyst warm-up control is control for warming up the catalyst of the exhaust emission control device. The catalyst warm-up control includes first control (FIRST WARM-UP CONTROL) and second control (SECOND WARM-UP CONTROL). The first control is control for operating the internal combustion engine at a first operating point (P1). The second control is control for, after the first control is executed, operating the internal combustion engine at a second operating (P2) point irrespective of a driving force that is required to propel the hybrid vehicle. An output of the internal combustion engine at the second operating point (P2) is larger than an output of the internal combustion engine at the first operating

A hybrid vehicle includes a generator capable of generating and supplying power to a battery; a drive motor that drives driving wheels of the hybrid vehicle with power supplied from the battery or power generated by the generator, an internal combustion engine that drives the generator; and a first exhaust purification device for exhaust purification arranged in an exhaust passage of the internal combustion engine. The hybrid vehicle is configured to perform catalyst temperature rise control to retard an ignition timing of the internal combustion engine when a temperature of the first exhaust purification device is lower than or equal to a predetermined temperature level. In the catalyst temperature rise control, a retardation amount of the ignition timing in a state where the hybrid vehicle experiences more vibration than in a stop state of the hybrid vehicle is set larger than that in the stop state of the hybrid vehicle.