A method for controlling a mild hybrid electric vehicle includes steps of: detecting data regarding the mild hybrid electric vehicle; determining a target torque of an engine according to the detected data; determining whether knocking of the engine occurs according to the detected data; determining a retardation amount of an ignition timing when it is determined that the knocking occurs; comparing the retardation amount of the ignition timing with a value; determining a loss amount of a combustion torque of the engine according to the retardation amount of the ignition timing when the retardation amount of the ignition timing is equal to or greater than the value; determining a target torque of a mild hybrid starter & generator (MHSG) according to the target torque of the engine and the loss amount of the combustion torque of the engine; and operating the MHSG to generate the target torque of the MHSG.

Systems and methods for improving operation of a hybrid vehicle driveline are presented. In one example, a margin torque for closing a torque converter clutch is adjusted responsive to a state of engine operation.

A control method of a power train for a hybrid vehicle is provided. The method includes determining whether an engine corresponds to an optimal operating point when intervention for upshifting is demanded during an HEV driving mode and determining whether an amount of demanded intervention is equal to or less than a value adding maximum intervention torques of a drive motor and an HSG. Each intervention torque of the drive motor and the HSG is determined to adjust a whole energy-collect rate by the drive motor and the HSG to a maximum value of the amount of demanded intervention, and simultaneously, the value adding the intervention torques of the drive motor and the HSG satisfies the amount of demanded intervention.

A hybrid vehicle includes an internal combustion engine, an electrical storage device, a rotary electric machine, 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 of an intake valve. The electrical storage device is configured to be charged. The rotary electric machine is configured to generate driving force for propelling the hybrid vehicle by using electric power that is supplied from the electrical storage device. The controller is configured to cause the hybrid vehicle to travel in a selected one of a charge sustaining mode and a charge depleting mode. The charge sustaining mode is a mode in which a state of charge of the electrical storage device is kept within a predetermined range. The charge depleting mode is a mode in which consumption of the state of charge is given a higher priority as compared to the charge sustaining mode. The controller is configured to change a switching condition for switching from the charge depleting mode to the charge sustaining mode such that a first state of charge is higher than a second state of charge. The first state of charge is an state of charge at which the controller switches from the charge depleting mode to the charge sustaining mode at the time when the operation characteristic of the intake valve is unchangeable to a desired operation characteristic. The second state of charge is an state of charge at which the controller switches from the charge depleting mode to the charge sustaining mode at the time when the operation characteristic of the intake valve is changeable to a desired operation characteristic.

A vehicle control system includes electronic controllers and first and second communications networks. The electronic controllers control a vehicle including an internal combustion engine and a drive motor. The electronic controllers include a management controller to manage travel control of the vehicle and a motor drive controller to control the drive motor. The first and second communications networks connect the electronic controllers together. The electronic controllers communicate via the first and second communications networks. The motor drive controller is configured to stop the drive motor when it is determined that a fault has occurred in the first communications network and configured to transmit information indicating that the fault has occurred in the first communications network to the management controller via the second communications network. The management controller is configured to control the electronic controllers not to communicate via the first communications network in response to the information.

Disclosed is a hybrid work vehicle capable of smooth work travel using a work device with a low output internal combustion engine, while avoiding battery exhaustion. The vehicle includes an internal combustion engine that supplies drive power to a travel device and a work device via power transmission means, a motor generator that is driven by a battery, a load information generation part that generates load information representing a sudden increase in rotational load, an assist characteristic determination part that determines motor assist characteristics defining an assist amount and an assist time period of assist control based on load information, and a motor control unit that controls the motor generator based on the motor assist characteristics.

A vehicle includes an engine, a climate control system, a cabin, and a controller. The controller is programmed to, in response to the climate control system supplying heat to a vehicle cabin and receiving a request for an economy mode, decrease an engine coolant temperature engine start threshold. The controller is further programmed to, in response to the engine coolant temperature becoming less than the threshold, start the engine.

A hybrid electric vehicle capable of starting an engine in the event of failure of a DC-DC converter and a method of controlling the hybrid electric vehicle are provided. The hybrid electric vehicle includes a driving motor, an engine, and a first relay that starts a starter. A second relay is disposed between a first power line, connected the starter and a first battery, and second power line, connects a DC-DC converter that converts the power of a second battery and an electric load. A controller selectively adjusts the states of the first relay and the second relay. Upon determining starting of the engine and detecting failure of the DC-DC converter, the controller maintains the on state of the second relay and turns on the first relay to perform cranking of the engine.

Based on a determination result by a nitrogen concentration determination section, an electronic control unit changes a switching line used to switch between a differential state and a non-differential state of a differential mechanism and a gear shift line used to switch a gear stage of an automatic transmission mechanism. In conjunction with a change of an engine operation point to a high-speed side in a nitrogen-enriched state of intake air, a first motor rotational speed in the differential state of the differential mechanism becomes higher than that in a non-enriched state of the intake air. Thus, corresponding to the above, the differential mechanism is appropriately switched between the differential state and the non-differential state, and the gear stage of the automatic transmission mechanism is appropriately switched.

A control system for a hybrid vehicle configured to prevent a reduction in the purifying performance of the catalyst in a predetermined operating mode. An operating mode of the hybrid vehicle can be selected from a first hybrid vehicle mode, a second hybrid vehicle mode, and a fixed mode. A controller that is configured to restrict a shifting operation between the first hybrid vehicle mode and the second hybrid vehicle mode via the fixed mode, when the purifying device is being warmed or the purifying device has to be warmed.