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.

A hybrid vehicle includes an internal combustion engine, a filter, an electrical storage device, a rotating electric machine, and a controller. The filter is configured to trap particulate matter in exhaust gas of the internal combustion engine. The rotating electric machine is configured to generate electric power using power from the internal combustion engine so as to charge the electrical storage device, and drive the internal combustion engine using electric power from the electrical storage device. The controller is configured to control the internal combustion engine and the rotating electric machine, so as to warm up the electrical storage device when regeneration control needs to be performed and when the temperature of the electrical storage device is lower than a reference value. The regeneration control is control for raising the temperature of the filter to a predetermined temperature so as to burn the particulate matter. The controller may be configured to execute the regeneration control when the temperature of the electrical storage device exceeds the reference value.

A vehicle has an engine, an exhaust aftertreatment system, an electric machine, and a controller configured to, in response to an actual engine torque output being less than an inferred engine torque, shut down the engine. A vehicle has an engine, an exhaust aftertreatment system, an electric machine, and a controller configured to, in response to an actual engine torque output being less than a first threshold and a torque request to the engine being greater than a second threshold, set a diagnostic code. A method includes receiving an actual engine torque output, receiving an engine torque request, and shutting down the engine when the actual engine torque output is less than a first threshold and the engine torque request is greater than a second threshold for a predetermined time period to limit temperature increase of a catalyst.

A vehicle drive system for a vehicle including a first prime mover, a first prime mover driven transmission, and a rechargeable power source can be configured for reduced fuel consumption at idle. The vehicle drive system includes an electric motor in direct or indirect mechanical communication with the first prime mover. The control system causes fuel to be eliminated to the first prime mover while the vehicle is stopped and causes the electric motor to rotate the first prime mover at a speed, thereby reducing fuel consumption at idle for the vehicle.

The teachings of the present disclosure may include operation of a drivetrain system for a vehicle with multiple operation modes. The first includes coupling the AC electric machine with the internal combustion engine for starting the internal combustion engine or for supplying an additional torque. The second includes coupling the internal combustion engine with the AC electric machine for charging the electric battery. The third includes decoupling the AC electric machine from the internal combustion engine and connecting an AC winding to a heating resistance of a catalyst device for electrically heating the catalyst device. The fourth includes coupling the internal combustion engine with the AC electric machine to the heating resistance for electrically heating the catalyst device.

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.

In an aspect, a computer system is provided comprising processing circuitry configured to acquiring information indicating a temperature of an exhaust aftertreatment system, EATS, of a vehicle, maintaining a current gear of the vehicle in response to the vehicle approaching a downhill slope and the acquired information indicating that the temperature should be increased, and decreasing speed of an engine of the vehicle for causing engine braking in the downhill slope, while maintaining a speed of the vehicle within a set vehicle speed range.

A computer system comprising processing circuitry configured to control a vehicle, the processing circuitry being configured to: determine that an expected travelling route of the vehicle comprises a downhill road segment followed by an uphill road segment; predict an engine exhaust condition of an engine of the vehicle, wherein the engine exhaust condition is expected to apply while driving the vehicle along the uphill road segment; determine a target temperature criterion for an exhaust aftertreatment system of the vehicle based on the predicted engine exhaust condition; and control the vehicle during the downhill road segment such that a temperature of the exhaust aftertreatment system meets the target temperature criterion at a beginning of the uphill road segment.

A vehicle drive system for a vehicle including a first prime mover, a first prime mover driven transmission, and a rechargeable power source can be configured for reduced fuel consumption at idle. The vehicle drive system includes an electric motor in direct or indirect mechanical communication with the first prime mover. The control system causes fuel to be eliminated to the first prime mover while the vehicle is stopped and causes the electric motor to rotate the first prime mover at a speed, thereby reducing fuel consumption at idle for the vehicle.