Fuel cell system with cooling and method of controlling the same
First Claim
1. A fuel cell system comprising:
- a fuel cell that generates an electric power and heat by a reaction of reaction gases;
a heat exchanger;
a coolant circuit for a coolant between the fuel cell and the heat exchanger;
a coolant circulating pump for circulating the coolant in the coolant circuit;
a drive motor for driving the coolant circulating pump, the coolant receiving and carrying the heat to the heat exchanger by the coolant circuit, the coolant circulating pump, and the drive motor; and
a control unit that controls a rotational speed of the drive motor and changes an upper limit of the rotational speed of the drive motor to control the rotational speed of the drive motor using the upper limit.
1 Assignment
0 Petitions
Accused Products
Abstract
A fuel cell system includes: a fuel cell that generates an electric power and heat by a reaction of a reaction gas; a heat exchanger; a coolant circuit for a coolant between the fuel cell and the heat exchanger; a coolant circulating pump for circulating the coolant in the coolant circuit; and a drive motor for driving the coolant circulating pump, the coolant receiving and carrying the heat to the heat exchanger by the coolant circuit, the coolant circulating pump, and the drive motor. A rotational speed of the drive motor is controlled according to an upper limit of the rotational speed of the drive motor which may be determined on the basis of a cooling capacity of the heat exchanger, a speed of the vehicle mounting the fuel cell system, a generated electric power, and a flow rate of the reaction gas.
-
Citations
12 Claims
-
1. A fuel cell system comprising:
-
a fuel cell that generates an electric power and heat by a reaction of reaction gases;
a heat exchanger;
a coolant circuit for a coolant between the fuel cell and the heat exchanger;
a coolant circulating pump for circulating the coolant in the coolant circuit;
a drive motor for driving the coolant circulating pump, the coolant receiving and carrying the heat to the heat exchanger by the coolant circuit, the coolant circulating pump, and the drive motor; and
a control unit that controls a rotational speed of the drive motor and changes an upper limit of the rotational speed of the drive motor to control the rotational speed of the drive motor using the upper limit. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A method of controlling a fuel cell system including:
- a fuel cell that generates an electric power and heat by a reaction of reaction gases;
a heat exchanger;
a coolant circuit for a coolant between the fuel cell and the heat exchanger;
a coolant circulating pump for circulating the coolant in the coolant circuit; and
a drive motor for driving the coolant circulating pump, the coolant receiving and carrying the heat to the heat exchanger by the coolant circuit, the coolant circulating pump, and the drive motor;
the method comprising the steps of;
(a) controlling a rotational speed of the drive motor; and
(b) changing an upper limit of the rotational speed of the drive motor to control the rotational speed of the drive motor using the upper limit. - View Dependent Claims (8, 9, 10, 11, 12)
- a fuel cell that generates an electric power and heat by a reaction of reaction gases;
Specification