A control apparatus for a hybrid vehicle includes a low temperature time hydraulic control section (11a) to perform a low temperature time hydraulic control to restrain a discharge quantity of operating oil from an oil pump (4) by limiting a line pressure of a transmission (7) at an engine cold time to a predetermined value smaller than a maximum value of a line pressure command pressure for a predetermined time period. The hydraulic control by this low temperature time hydraulic control section (11a) is continued until the motor is started after the start of the engine and a first clutch (3) is engaged at the time of low temperature of engine (1). By so doing, the control apparatus can prevent the oil pump from being stopped by inappropriate starting timing of the low temperature time hydraulic control.

A control apparatus for a hybrid vehicle includes a low temperature time hydraulic control section (11a) to perform a low temperature time hydraulic control to restrain a discharge quantity of operating oil from an oil pump (4) by limiting a line pressure of a transmission (7) at an engine cold time to a predetermined value smaller than a maximum value of a line pressure command pressure for a predetermined time period. The hydraulic control by this low temperature time hydraulic control section (11a) is continued until the motor is started after the start of the engine and a first clutch (3) is engaged at the time of low temperature of engine (1). By so doing, the control apparatus can prevent the oil pump from being stopped by inappropriate starting timing of the low temperature time hydraulic control.

A heat management control device for a vehicle that includes: an electric motor that is applied as a motive power source; a power supply section that includes a storage battery and that supplies electrical power to the electric motor; a charging device that charges the storage battery through a connection to an external power source; a heat exchanger that performs heat exchange of heat generated by the charging device during charging with fluid flowing in a specific transport path; a heat storage section that uses a chemical reaction partway along the specific transport path in order to recover heat from the fluid and that stores the recovered heat; and a fluid supply controller that, from immediately after a vehicle is started, releases heat stored by the heat storage section to the fluid, and selectively supplies the fluid to a predetermined plurality of warm-up targets.

A method of controlling an engine speed of a hybrid vehicle including a motor that is connected to a transmission, a battery that provides a driving voltage to the motor, an engine that is selectively connected to the motor through an engine clutch, and a hybrid starter-generator (HSG) that is connected to the engine includes: comparing, when the engine is started, an external air temperature to a setting temperature; setting a battery rated derating factor based on the comparison of the external air temperature to the setting temperature; determining an output area of the HSG according to a battery voltage; and outputting an available torque of the HSG based on the set battery rated derating factor and the determined HSG output area.

A method of controlling an engine speed of a hybrid vehicle including a motor that is connected to a transmission, a battery that provides a driving voltage to the motor, an engine that is selectively connected to the motor through an engine clutch, and a hybrid starter-generator (HSG) that is connected to the engine includes: comparing, when the engine is started, an external air temperature to a setting temperature; setting a battery rated derating factor based on the comparison of the external air temperature to the setting temperature; determining an output area of the HSG according to a battery voltage; and outputting an available torque of the HSG based on the set battery rated derating factor and the determined HSG output area.

A control system for a hybrid vehicle configured to prevent an undesirable engagement of the selectable one-way clutch is provided. In order to reduce a drag torque resulting from a cranking of an engine to bring the selectable one-way clutch into engagement mode, the control system raises a temperature of lubrication oil before carrying out the cranking of the engine if it is too low, and carries out the cranking of an engine by a motor after the temperature of the lubrication oil is raised to a level at which viscosity thereof is reduced.

An apparatus and method for controlling cold starting of a mild hybrid vehicle, are disclosed. The method includes: measuring, by a sensor, a cooling water temperature of the vehicle when a request is received to start an engine; operating, by a controller, a starter to drive an engine when the cooling water temperature is less than a preset reference temperature, and stopping the operation of the starter and operating an MHSG to drive the engine when RPM of the engine driven by the starter exceeds a preset reference value. In particular, stepwise starting according to the cold starting of the vehicle is performed. The apparatus and the method are advantageous in that a starter and alternator are simultaneously controlled under a cold starting condition to provide startability and reduce capacity of a starter, reducing manufacturing costs.

The start system related to the present invention is for an internal combustion engine of a hybrid vehicle. The hybrid vehicle is configured to use at least one of a differential mechanism and a transmission gear mechanism to temporarily change an engine speed in starting of the internal combustion engine. The start system includes an electronic control unit. The electronic control unit is configured to determine a duration for which the engine speed needs to be changed in starting of the internal combustion engine. The electronic control unit is configured to determine a degree of change in the engine speed in starting of the internal combustion engine. The electronic control unit is configured to determine whether the engine speed needs to be changed by changing the gear position of the transmission gear mechanism based on the degree and the duration.

Methods and systems are provided for restarting an engine when a high pressure fuel pump is degraded. In response to an indication of high pressure fuel pump degradation, fuel may be injected during an intake stroke, rather than a compression stroke, for a selected number of combustion events since the engine restart. By shifting to an intake stroke injection, the engine may be started even when sufficient fuel rail pressures are not available.

Methods and systems are provided for restarting an engine when a high pressure fuel pump is degraded. In response to an indication of high pressure fuel pump degradation, fuel may be injected during an intake stroke, rather than a compression stroke, for a selected number of combustion events since the engine restart. By shifting to an intake stroke injection, the engine may be started even when sufficient fuel rail pressures are not available.