An embodiment system for mild hybrid starter and generator (MHSG) failure diagnosis of a mild hybrid vehicle includes a data detection part configured to detect data for determining whether to activate a catalyst, and a controller configured to determine whether there is an MHSG failure using a deviation between a required torque and an actual operating torque of an MHSG after determining whether catalyst activation is needed and whether to start a stage of the MHSG failure diagnosis based on the data detected by the data detection part.

The embodiments disclose a method including separating kinetic speed from energy using a transmission platform, directing energy in the kinetic form at a predetermined speed from 0 to 100%, employing the transmission platform with fewer pieces to increase overall efficiency at a lower cost to produce, and integrating the transmission platform with combustion engines and electric motors to achieve more efficiency and greater performance.

When a first type gear shift line is used as a gear shift line to change the gear ratio, and a predetermined condition including a condition that a state of charge of the power storage device is equal to or lower than a first ratio is satisfied, the control device changes the gear shift line to a second type gear shift line that recommends a lower speed gear ratio than the first type gear shift line.

Aspects of the present invention relate to a method and to a control system for controlling movement of a vehicle to provide vehicle creep, the vehicle comprising an engine and an electric traction motor, the control system comprising one or more controllers, wherein the control system is configured to: while a torque path between the engine and a first set of vehicle wheels is disconnected, control the electric traction motor to provide tractive torque to a second set of vehicle wheels to automatically move the vehicle to provide electric vehicle creep, wherein the electric vehicle creep is controlled by a mathematical model of engine creep torque that would be provided by the engine when the torque path between the engine and the first set of vehicle wheels is connected.

The present application relates to the technical field of vehicles and provides a vehicle drive control method and system including: obtaining a state of a generator and/or a drive motor of a hybrid vehicle (S101); determining whether the hybrid vehicle meets conditions for entering a parallel operation mode when the temperature in the state is greater than a safety temperature threshold and/or a fault condition in the state shows that a fault occurs in the generator and/or the drive motor (S102); and controlling the hybrid vehicle to adjust the load distribution of the engine, the generator, and the drive motor in the parallel operation mode when the hybrid vehicle meets the conditions for entering the parallel operation mode, so that the temperature of the generator and/or the drive motor decreases until below the safety temperature threshold and/or there is no fault (S103).

A method and a system for a drive control of a vehicle, the method for the drive control of the vehicle includes: obtaining request information reflecting a power demand of a user on the vehicle and performance information reflecting a power performance of the vehicle; determining whether the vehicle meets a condition for activating a parallel operation mode according to the request information and the performance information when a result of comparison between the request information and the performance information indicates that the vehicle power performance cannot meet the power demand of the user on the vehicle; and activating the parallel operation mode of the vehicle in order that the vehicle outputs a power that meets the power demand of the user on the vehicle in the parallel operation mode, when the vehicle meets the condition for activating the parallel operation mode.

A vehicle control apparatus output a packing hydraulic-pressure command value and a cranking hydraulic-pressure command value higher than the packing hydraulic-pressure command value. The packing hydraulic-pressure command value is outputted to place a clutch in a pack-clearance-elimination completion state in a process of switching of the clutch from a released state to an engaged state. The cranking hydraulic-pressure command value is outputted, after elapse of a predetermined time required to place the clutch in the pack-clearance-elimination completion state, to cause the clutch to transmit a cranking torque required by a cranking by which a rotational speed of an engine is increased. In a case in which it is determined that a request to increase a vehicle power performance during output of the packing hydraulic-pressure command value, the cranking hydraulic-pressure command value is outputted in place of the packing hydraulic-pressure command value even before the elapse of the predetermined time.

A hybrid vehicle includes: an internal combustion engine; a rotating electric machine; a planetary gear mechanism to which the internal combustion engine, the rotating electric machine and an output shaft are connected; a catalyst that purifies exhaust gas of the internal combustion engine; and a controller that controls the internal combustion engine and the rotating electric machine. The controller controls the internal combustion engine and the rotating electric machine to perform catalyst temperature control to shift an operating point on a map representing a relationship between rotation speed of the internal combustion engine and torque generated by the internal combustion engine so that the catalyst has a temperature within an appropriate temperature range. Degradation of the catalyst can be suppressed without deteriorating the function of the catalyst.

A vehicle includes an engine, a first MG, a planetary gear mechanism, a battery that stores power generated by the first MG and supplies the stored power to the first MG, and an HV-ECU that controls the engine and the first MG. The engine includes a turbo. A boost line is determined on a map representing a relationship between the rotation speed of the engine and torque generated by the engine, and the turbo boosts suctioned air when torque generated by the engine, as indicated by an operating point on the map, exceeds the boost line. The HV-ECU controls the engine and the first MG so that when the allowable value Wout of power output from the battery is small, the operating point exceeds the boost line at a higher rotation speed than when the allowable value Wout is large.

A controller for a hybrid vehicle controls an electric motor such that a motor torque is input to a crankshaft in order to compensate for a decrease in an engine torque when a cylinder deactivation control is executed, the decrease resulting from suspension of combustion in one or some of cylinders. The controller calculates an engine torque calculated value using an engine rotation speed, a motor rotation speed, and the motor torque. The controller diagnoses that the cylinder deactivation control is functioning normally when the engine torque calculated value is less than a torque determination value and diagnose that the cylinder deactivation control is not functioning normally when the engine torque calculated value is not less than the torque determination value during the execution of the cylinder deactivation control.