Honda Giken Kogyo Kabushiki Kaisha

Honda Motor Co., Ltd.

Kazuo Kotaka

Hibiki Saeki

Satoshi Aoyagi

Kazunori Watanabe

Yusuke Hasegawa

Dai Saitoh

Yoshikazu Murakami

Kenichiro Kimura

Hisayoshi Takahashi

An electric vehicle includes a device which determines, on the basis of the gradient of a road surface, a target acceleration of the vehicle in the case where the operational states of an accelerator (gas) pedal and a brake pedal of the vehicle are an OFF state when the vehicle is traveling on a down-slope road, a device which determines the correction amount of a regenerative torque for bringing the actual acceleration of the vehicle close to the target acceleration, a device which determines a basic target torque of an electric motor, which becomes a regenerative torque when the operational state of the accelerator (gas) pedal is the OFF state, on the basis of the operational state of the accelerator (gas) pedal, and a device which determines a target torque by correcting the basic target torque on the basis of at least the aforesaid correction amount. The output torque of the electric motor is controlled to the determined target torque. Thus, when the electric vehicle travels on the down-slope road, the regenerative operation of the electric motor is accomplished such that an acceleration suited to the gradient of the road surface can be generated in the vehicle while minimizing the influences of disturbance factors.

Electric vehicle and regeneration control method for electric vehicle

The object of the present invention is provide a drive control system of an electric vehicle that can prevent overshoot of the amount of slip. The drive control system of the electric vehicle includes: a motor to drive a driving wheel; a PDU; a number-of-revolution sensor that detects the number of revolutions of the motor; a grip number of revolutions calculating device for calculating the current grip number of revolutions of the motor; a motor power limiting value calculating portion and a conversion portion that determines the limiting torque value of the motor; and a driving torque determining portion that determines the driving torque of the motor.

Drive control system of an electric vehicle

The present invention provides a highly efficient fuel cell power supply unit, which is constructed by directly connecting a fuel cell with a capacitor. In this power supply unit, a control device of the unit calculates the output voltage Vof the fuel cell after the variation of electrical load based on the synthetic current-voltage characteristics of the fuel cell and the capacitor and the predetermined width of the variation of electrical load &#x394;I, calculates the corresponding current Ifc', and then calculates the equilibrium reacting gas supply amount Qa, and supplies an excess amount of the reacting gas exceeding Qabefore the variation of electrical load.

Fuel cell power control unit

A fuel cell power supply has a fuel cell and a capacitor which are connected parallel to each other, and controls the amount of a reacting gas supplied to the fuel gas based on a target supply current. A capacitor open voltage calculator calculates an open voltage (Vcap_O) of the capacitor from a detected current (Icap) of the capacitor, an output voltage (Vout) of the fuel cell, and an internal resistance (Rcap) of the capacitor. A corrective quantity calculator calculates a corrective quantity (Ifc_AM) for a target supply current (Ifc_REQ) based on the open voltage (Vcap_O) of the capacitor, the output voltage (Vout) of the fuel cell, and the target supply current (Ifc_REQ), so as to prevent an air compressor from operating excessively and also prevent the fuel cell from suffering a gas shortage, depending on current-voltage characteristic data (Icap&#x2212;Vcap) of the fuel cell and current-voltage characteristic data (Ifc&#x2212;Vcap) of the capacitor.

Fuel cell power supply

A fuel cell power supply has a fuel cell and a capacitor which are connected parallel to each other, and controls the amount of a reacting gas supplied to the fuel gas based on a target supply current. A capacitor open voltage calculator calculates an open voltage of the capacitor from a detected current of the capacitor, an output voltage of the fuel cell, and an internal resistance of the capacitor. A corrective quantity calculator calculates a corrective quantity for a target supply current based on the open voltage of the capacitor, the output voltage of the fuel cell, and the target supply current, so as to prevent an air compressor from operating excessively and also prevent the fuel cell from suffering a gas shortage, depending on current-voltage characteristic data of the fuel cell and current-voltage characteristic data of the capacitor.

A power supply management control unithas a requested-amount-of-generated-electric-energy calculatorfor calculating a requested amount of electric energy (Ifc_CAL) generated by a fuel cell stackdepending on a requested electric energy of an electric motor and an electric load other than the electric motor, an actual-amount-of-generated-electric-energy calculatorfor calculating an actual amount of electric energy (Ifc_s) generated by the fuel cell stackbased on a current (Ifc) detected by a fuel cell sensor, and a target selectorfor comparing the requested amount of electric energy (Ifc_CAL) and the actual amount of electric energy (Ifc_s) with each other, regarding the requested amount of electric energy (Ifc_CAL) as a target amount of generated electric energy (Ifc_REQ) for a fuel cell control unitif the requested amount of electric energy (Ifc_CAL) is equal to or greater than the actual amount of electric energy (Ifc_s), and regarding the actual amount of electric energy (Ifc_s) as target amount of generated electric energy (Ifc_REQ) for the fuel cell control unitif the actual amount of electric energy (Ifc_s) greater than the requested amount of electric energy (Ifc_CAL).

Growing community of inventors

Wako, Japan

Kazuo Kotaka