A vehicle power supply system and a method for operating the same are provided. The vehicle power supply system includes a main battery and a sub-battery to supply power to an electronic load inside a vehicle, and a controller to control supplying of the power to the electronic load using at least one of the main battery or the sub-battery, by monitoring the main battery and the sub-battery. The controller determines whether the main battery allows entrance into Idle Stop and Go, determines whether the sub-battery is able to assist the ISG, and controls the sub-battery to assist the main battery to supply the power to the electronic load, when the main battery allows the entrance into the ISG, when the sub-battery is able to assist the ISG, and when entering into the ISG.

In a vehicle control device with an automatic engine stop function, when the engine is in a non-operating state and the shift lever is operated to the parking range, the engine is controlled to start to supply operating oil to a valve timing changing means. The valve timing changing means is thereupon caused to change the intake valve close timing (IVC) to a predetermined advance angle position and subsequently locked thereat. The engine is then controlled to stop.

An electronic control unit of a hybrid vehicle is configured to determine whether or not parking operation of the hybrid vehicle is being performed. The electronic control unit is configured to control the engine and the rotary electric machine such that starting the engine when the parking operation of the hybrid vehicle is being performed is harder than starting the engine when the parking operation of the hybrid vehicle is not being performed.

A vehicle engine start/stop control method includes shifting an automatic transmission to a park or neutral position and auto-stopping the engine in response the automatic transmission being in the park or neutral position for a predetermined period of time that begins with a shift of the automatic transmission to the park or neutral position.

The present disclosure provides a hybrid electric vehicle, a drive control method and a drive control device of a hybrid electric vehicle. The drive control method includes: obtaining a current gear position of the hybrid electric vehicle and a current electric charge level of a power battery; obtaining a slope of a road on which the hybrid electric vehicle is driving, if the current gear position of the hybrid electric vehicle and the current electric charge level of the power battery meet a preset requirement; and causing a working state of an engine and/or a motor of the hybrid electric vehicle according to the slope of the road on which the hybrid electric vehicle is driving.

A method for controlling autonomous driving in an autonomous vehicle includes detecting an autonomous driving-related critical situation during the autonomous driving, outputting a notification message requesting a control-right handover from an autonomous driving system to a human driver when the autonomous driving-related critical situation is detected, and activating a minimal risk maneuver (MRM) driving mode to deactivate the autonomous driving system when the control-right handover is not successful. In particular, when the minimal risk maneuver (MRM) driving mode is activated, the deactivated state of the autonomous driving system is maintained until an engine-restart of the autonomous vehicle is detected.

A hybrid electric vehicle and method of its control include a parallel hybrid powertrain including an engine, a transmission, a battery system, a first electric motor coupled to the engine by a first clutch between the engine and the first electric motor, a second electric motor coupled to the transmission and to the first electric motor by a second clutch between the first and second electric motors, and a controller configured to control the parallel hybrid powertrain for optimal operation across a plurality of different propulsion and charging modes, including calculating cost values for each of the engine and the first and second electric motors and selecting optimal propulsion and charging modes based on the calculated cost values.

A power supply system for a vehicle including a driving battery, first and second device batteries, a DC-to-DC converter, a control system device, and a specific device includes first and second power lines, first and second switches, and a coupling line. The first power line transmits power from the first device battery to the control system device. The second power line transmits power from the second device battery to the specific device. The first switch is coupled between the DC-to-DC converter and the first power line. The first switch includes a diode disposed in a direction to flow a current to the first power line. The coupling line is configured to transmit power from a node between the DC-to-DC converter and the first switch to the second power line. The second switch selectively opens and closes an electric circuit of the coupling line.

A auto-stop/start vehicle with an engine and a battery includes at least one controller that calibrates an engine auto-stop delay time based on a state of charge (SOC) of a battery. The calibrated engine auto-stop delay time increases as the SOC of the battery decreases, and decreases as the SOC of the battery increases. The controller further initiates shutdown of an engine upon expiration of the calibrated engine auto-stop delay time.

A method and a corresponding device are provided for preventing an undesired vehicle motion during an automatic switch-off process of a drive machine in a motor vehicle. An automatic switch-off process is initiated by a start-stop apparatus before the standstill is reached if the motor vehicle is braked because of a deceleration request and the speed of the vehicle is less than a specified first speed threshold. A brake pressure of suitable magnitude is caused to be locked-in in the brake system even before the vehicle reaches the standstill if a first signal indicating that the vehicle standstill will soon be reached and a second signal indicating that an inability of the drive machine to operate in a self-sustaining manner will soon be reached are acquired because of an initiated automatic switch-off process of the drive machine.