Abstract: A method of controlling a hybrid vehicle with an engine, a battery, and at least one motor generator. System efficiencies of each of several candidate driving states are calculated. Calculating efficiency when the battery is discharged uses power of the engine Pfuel, power drawn from the battery Pb,out, and required driving power Pdemand. Calculating efficiency when the battery is charged uses Pfuel, Pdemand, and power charged to the battery Pb,in. Pb,out is calculated using a real battery discharge power Pb,out,real, a battery discharge energy efficiency ?bd, a historic efficiency ?b,pwr of energy loss when the battery is charged, and a correction coefficient SOCcorrection for controlling the battery charge amount. Pb,in is calculated using real battery charge power Pb,in,real, battery charge energy efficiency ?bc, ?bd, and efficiency ?in,pwr when power is consumed in the future. The driving state with the highest efficiency is then selected.

Abstract: A method of controlling a hybrid vehicle that is driven by at least one of an engine and a motor generator, the motor generator exchanging power with a battery. The method includes determining whether the vehicle is accelerating, decelerating, or traveling at a constant speed; selecting a range of a state of charge of the battery based on whether the vehicle is accelerating, decelerating, or traveling at a constant speed; and controlling at least one of: torque and number of rotations of the engine and the motor generator, such that the power being exchanged between the battery and the motor generator is such that the state of charge is within the selected range.

Abstract: A method of controlling a hybrid vehicle with an engine, a battery, and at least one motor generator. System efficiencies of each of several candidate driving states are calculated. Calculating efficiency when the battery is discharged uses power of the engine Pfuel, power drawn from the battery Pb,out, and required driving power Pdemand. Calculating efficiency when the battery is charged uses Pfuel, Pdemand, and power charged to the battery Pb,in. Pb,out is calculated using a real battery discharge power Pb,out,real, a battery discharge energy efficiency ?bd, a historic efficiency ?b,pwr of energy loss when the battery is charged, and a correction coefficient SOCcorrection for controlling the battery charge amount. Pb,in is calculated using real battery charge power Pb,in,real battery charge energy efficiency ?bc, ?bd, and efficiency ?in,pwr when power is consumed in the future. The driving state with the highest efficiency is then selected.

Abstract: A method of controlling a hybrid vehicle that is driven by at least one of an engine and a motor generator, the motor generator exchanging power with a battery. The method includes determining whether the vehicle is accelerating, decelerating, or traveling at a constant speed; selecting a range of a state of charge of the battery based on whether the vehicle is accelerating, decelerating, or traveling at a constant speed; and controlling at least one of: torque and number of rotations of the engine and the motor generator, such that the power being exchanged between the battery and the motor generator is such that the state of charge is within the selected range.

Abstract: There is provided a battery pack system with estimation accuracy of a remaining capacity of a secondary batter enhanced. A current accumulation coefficient correction section 109 calculates a correction amount ? with respect to a current accumulation coefficient k in accordance with a battery electromotive force Veq from an electromotive force calculation section 105. A remaining capacity calculation section 112 estimates a remaining capacity SOC by current accumulation, based on the current accumulation coefficient k calculated from a correction amount ?, and a charging efficiency ? based on a currently estimated remaining capacity calculated by a charging efficiency calculation section 110.

Abstract: There is provided a battery pack system that allows an output limit during short-time discharging and long-time discharging of a secondary battery, and limits the output appropriately upon request of a vehicle. An output limiting section 104 is provided for changing a limit value of output electric power from the secondary battery when voltage data V (n) from a voltage measuring section 102 reaches a predetermined discharging termination voltage. The output limiting section 104 has short-time output information (Pp) for allowing short-time discharging of the secondary battery and normal output information (Pn) for allowing long-time discharging of the secondary battery, and sets a first discharging termination voltage (V1) during short-time discharging to be lower than a second discharging termination voltage (V2) during long-time discharging.

Abstract: There is provided a battery pack system that allows an output limit during short-time discharging and long-time discharging of a secondary battery, and limits the output appropriately upon request of a vehicle. An output limiting section 104 is provided for changing a limit value of output electric power from the secondary battery when voltage data V (n) from a voltage measuring section 102 reaches a predetermined discharging termination voltage. The output limiting section 104 has short-time output information (Pp) for allowing short-time discharging of the secondary battery and normal output information (Pn) for allowing long-time discharging of the secondary battery, and sets a first discharging termination voltage (V1) during short-time discharging to be lower than a second discharging termination voltage (V2) during long-time discharging.

Abstract: There is provided a battery pack system with estimation accuracy of a remaining capacity of a secondary batter enhanced. A current accumulation coefficient correction section 109 calculates a correction amount ? with respect to a current accumulation coefficient k in accordance with a battery electromotive force Veq from an electromotive force calculation section 105. A remaining capacity calculation section 112 estimates a remaining capacity SOC by current accumulation, based on the current accumulation coefficient k calculated from a correction amount ?, and a charging efficiency ? based on a currently estimated remaining capacity calculated by a charging efficiency calculation section 110.