A vehicle method for barometric pressure identification, including adjusting engine operation responsive to barometric pressure, the barometric pressure based on a pressure change at a sector of the fuel system when the sector is sealed with the vehicle travelling. The method may utilize a pressure change at the sealed sector of the fuel system, such as a sealed fuel tank, to identify barometric pressure, even with the engine off for extended durations of vehicle travel. As such, in a hybrid-vehicle application, including during hill descents in which the engine is maintained off, barometric pressure can still be updated.

A fuel pump system of a hybrid vehicle is provided. The fuel pump system prevents a fuel pump from continuing to operate when fuel is exhausted, whereby the fuel pump may be damaged. The pressure of fuel is measured in response to exhaustion of fuel, and when the pressure of fuel is low, fuel is circulated within the fuel pump instead of being supplied to the engine side, thereby preventing the fuel pump from being stuck due to frictional heat

A fuel pump system of a hybrid vehicle is provided. The fuel pump system prevents a fuel pump from continuing to operate when fuel is exhausted, whereby the fuel pump may be damaged. The pressure of fuel is measured in response to exhaustion of fuel, and when the pressure of fuel is low, fuel is circulated within the fuel pump instead of being supplied to the engine side, thereby preventing the fuel pump from being stuck due to frictional heat

Various systems and methods are described for controlling an engine in a vehicle, the engine being coupled to a transmission. One example method comprises, under selected braking conditions, shutting-off the engine and spinning-down the engine to rest while the vehicle is traveling, and in response to a foot-off-brake event, restarting the engine by at least partially engaging the transmission and adjusting engine torque control actuators.

An engine is controlled such that a first motor rotates at a rotational speed that causes a counter-electromotive voltage of the first motor to be higher than direct current-side voltages of a first inverter and a second inverter, and the first motor outputs torque to a driving shaft through a planetary gear set when an accelerator is on during specified travelling with gates of the first inverter and the second inverter being cut off and an engine being operated. When the accelerator is turned off during the specified traveling, fuel injection of the engine is stopped.

Methods and systems are provided for a fuel system in a hybrid vehicle. In one example, a method includes activating a fuel pump in a fuel tank included in the hybrid vehicle responsive to a refueling event with a level of residual fuel higher than a fill threshold. By activating the fuel pump, residual fuel in the fuel tank is mixed with newly received fuel in the refueling event enabling improved combustion in a subsequent engine-on condition.

A vehicle control device includes: an on-vehicle object recognizing portion that recognizes whether an on-vehicle object that is a person other than a driver or a luggage is present on a saddle-ridden type vehicle; a stop position recognizing portion that recognizes whether the saddle-ridden type vehicle has stopped in middle of or immediately before an uphill slope; and an engine control portion that controls an engine output in the saddle-ridden type vehicle, and, when the on-vehicle object is present on the saddle-ridden type vehicle and the saddle-ridden type vehicle has stopped in middle of or immediately before the uphill slope based on recognition results of the on-vehicle object recognizing portion and the stop position recognizing portion, the engine control portion performs engine output increase control as defined herein.

A vehicle method for barometric pressure identification, including adjusting engine operation responsive to barometric pressure, the barometric pressure based on a pressure change at a sector of the fuel system when the sector is sealed with the vehicle travelling. The method may utilize a pressure change at the sealed sector of the fuel system, such as a sealed fuel tank, to identify barometric pressure, even with the engine off for extended durations of vehicle travel. As such, in a hybrid-vehicle application, including during hill descents in which the engine is maintained off, barometric pressure can still be updated.

Various systems and methods are described for controlling an engine in a vehicle, the engine being coupled to a transmission. One example method comprises, under selected braking conditions, shutting-off the engine and spinning-down the engine to rest while the vehicle is traveling, and in response to a foot-off-brake event, restarting the engine by at least partially engaging the transmission and adjusting engine torque control actuators.

A fuel pump system of a hybrid vehicle is provided. The fuel pump system prevents a fuel pump from continuing to operate when fuel is exhausted, whereby the fuel pump may be damaged. The pressure of fuel is measured in response to exhaustion of fuel, and when the pressure of fuel is low, fuel is circulated within the fuel pump instead of being supplied to the engine side, thereby preventing the fuel pump from being stuck due to frictional heat.