System and method for controlling power distribution of fuel cell hybrid electric vehicle
First Claim
1. A system for controlling power distribution of a fuel cell hybrid electric vehicle, comprising:
- a fuel cell used as a main power source;
a battery used as an auxiliary power source;
a bi-directional DC/DC converter connected to the battery to allow for the input of power to and output from the battery;
an inverter electrically connected to the bi-directional DC/DC converter and the fuel cell;
a motor connected to the inverter and which converts electrical energy into rotational mechanical energy for driving the vehicle; and
a controller for estimating a required vehicle power and controlling power transmission between the fuel cell, the battery, the bi-directional DC/DC converter, and the inverter based on the estimated required vehicle power and states of the fuel cell and of the battery;
wherein the controller, according to a present required vehicle power and a battery charge state, selectively performs control into one of a plurality of modes including;
a fuel cell mode, in which the energy of the fuel cell is transmitted through the inverter to drive the motor;
a battery discharge mode, in which energies of the fuel cell and the battery are simultaneously transmitted through the inverter to drive the motor;
a battery charge mode, in which part of the energy output from the fuel cell is transmitted through the inverter to drive the motor, and another part of the energy output from the fuel cell is transmitted through the bi-directional DC/DC converter to charge the battery; and
a regeneration mode, in which restored braking energy is transmitted through the bi-directional DC/DC converter to charge the battery.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention relates to a system and method for controlling power distribution of a fuel cell hybrid electric vehicle. The system includes a fuel cell, a battery, a DC/DC converter connected to the battery for the input and output of power, an inverter connected to the DC/DC converter and fuel cell, a motor connected to the inverter, and a controller for estimating the required vehicle power. Further the present invention controls power transmission between the fuel cell, the battery, the DC/DC converter, and the inverter. The controller selectively performs control into one of a fuel cell mode, a battery discharge mode, a battery charge mode, and a regeneration mode.
72 Citations
15 Claims
-
1. A system for controlling power distribution of a fuel cell hybrid electric vehicle, comprising:
-
a fuel cell used as a main power source;
a battery used as an auxiliary power source;
a bi-directional DC/DC converter connected to the battery to allow for the input of power to and output from the battery;
an inverter electrically connected to the bi-directional DC/DC converter and the fuel cell;
a motor connected to the inverter and which converts electrical energy into rotational mechanical energy for driving the vehicle; and
a controller for estimating a required vehicle power and controlling power transmission between the fuel cell, the battery, the bi-directional DC/DC converter, and the inverter based on the estimated required vehicle power and states of the fuel cell and of the battery;
wherein the controller, according to a present required vehicle power and a battery charge state, selectively performs control into one of a plurality of modes including;
a fuel cell mode, in which the energy of the fuel cell is transmitted through the inverter to drive the motor;
a battery discharge mode, in which energies of the fuel cell and the battery are simultaneously transmitted through the inverter to drive the motor;
a battery charge mode, in which part of the energy output from the fuel cell is transmitted through the inverter to drive the motor, and another part of the energy output from the fuel cell is transmitted through the bi-directional DC/DC converter to charge the battery; and
a regeneration mode, in which restored braking energy is transmitted through the bi-directional DC/DC converter to charge the battery. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A method for controlling power distribution of a fuel cell hybrid electric vehicle that uses a power distribution system, the system including a fuel cell used as a main power source, a battery used as an auxiliary power source, a bi-directional DC/DC converter electrically connected to the battery and the fuel cell, and a controller that controls power transmission between the fuel cell, the battery, and the bi-directional DC/DC converter, the method comprising:
-
estimating a required vehicle power in a present state;
determining if the required vehicle power indicates a regenerative state;
setting a fuel cell required output amount to zero if the required vehicle power indicates a regenerative state;
establishing an output current of the bi-directional DC/DC converter such that the battery may be charged based on a charge state of the battery;
determining if the battery is overcharged;
estimating a battery charge required amount if the battery is not overcharged;
establishing a regeneration energy maximum value of a motor as the battery charge required amount; and
establishing an output current of the bi-directional DC/DC converter to allow for the charge of the battery by an amount equal to the calculated battery charge required amount. - View Dependent Claims (8)
-
-
9. A method for controlling power distribution of a fuel cell hybrid electric vehicle that uses a power distribution system, the system including a fuel cell used as a main power source, a battery used as an auxiliary power source, a bi-directional DC/DC converter electrically connected to the battery and the fuel cell, and a controller that controls power transmission between the fuel cell, the battery and the bi-directional DC/DC converter, the method comprising:
-
estimating a required vehicle power in a present state;
determining if the required vehicle power indicates a regenerative state;
setting a fuel cell required output amount to zero if the required vehicle power indicates a regenerative state;
establishing an output current of the bi-directional DC/DC converter such that the battery may be charged based on a charge state of the battery;
determining if the required vehicle power is less than a predetermined power level if the estimated required vehicle power is not in the regenerative state;
determining that the battery requires charging if the required vehicle power is less than the predetermined power level; and
calculating a battery charge required amount and performing control to charge the battery according to the calculated battery charge required amount. - View Dependent Claims (10, 11, 12, 13, 14, 15)
-
Specification