COOLING SYSTEM AND OPERATION METHOD OF ELECTRIC OIL PUMP IN COOLING SYSTEM

• US 20150184577A1
• Filed: 12/17/2014
• Published: 07/02/2015
• Est. Priority Date: 12/26/2013
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: SUZUKI, Shinjiro
• Granted Patent: US 10,180,100 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F01P 7/16 by thermostatic control
• CPC Class Codes: F04B 49/02 Stopping, starting, unloading or idling control
• CPC Class Codes: F04D 15/0077 Safety measures F04D15/02 takes precedence
• CPC Class Codes: F04D 15/0088 Testing machines

Abstract

A cooling system 100 includes an electric oil pump 18, an outside air temperature sensor 22, an oil temperature sensor 21, and a controller 30. The controller 30 permits the actuation of the electric oil pump 18 in one of a first case where an oil temperature To is equal to or greater than a first threshold (A) and where an outside air temperature Ta is equal to or greater than a second threshold (B), a second case where the outside air temperature Ta is less than the second threshold (B) and where the oil temperature To is equal to or greater than a third threshold (C) higher than the first threshold (A), and a third case where the oil temperature To is less than the first threshold (A) and where the outside air temperature Ta is equal to or greater than a fourth threshold (D) higher than the second threshold (B).

Claims

1. A cooling system comprising

an electric oil pump which circulates cooling oil;

an outside air temperature sensor which detects an outside air temperature;

an oil temperature sensor which detects an oil temperature of the cooling oil; and

a controller which judges permission for the actuation of the electric oil pump,

wherein the controller has electric oil pump actuation permitting means for permitting the actuation of the electric oil pump in one of

a first case where the oil temperature detected by the oil temperature sensor is equal to or greater than a first threshold and where the outside air temperature detected by the outside air temperature sensor is equal to or greater than a second threshold,

a second case where the outside air temperature is less than the second threshold and where the oil temperature is equal to or greater than a third threshold higher than the first threshold, and

a third case where the oil temperature is less than the first threshold and where the outside air temperature is equal to or greater than a fourth threshold higher than the second threshold.

2. The cooling system according to claim 1, wherein

the controller activates the electric oil pump and judges the abnormality of the electric oil pump, and

the controller has electric oil pump abnormality judging means for continuing the actuation of the electric oil pump without judging the abnormality of the electric oil pump when the electric oil pump is not activated by an activation instruction for the electric oil pump in the second case and the third case.

3. The cooling system according to claim 1, wherein

the electric oil pump is disposed outside a case to store a vehicle driving motor, and the electric oil pump circulates the cooling of in the case through the motor,

the oil temperature sensor detects the oil temperature of the cooling oil in the case, and

the electric oil pump and the case are connected by an external pipe outside the case.

4. The cooling system according to claim 2, wherein

the electric oil pump is disposed outside a case to store a vehicle driving motor, and the electric oil pump circulates the cooling oil in the case through the motor,

the oil temperature sensor detects the oil temperature of the cooling oil in the case, and

the electric oil pump and the case are connected by an external pipe outside the case.

5. An operation method of an electric oil pump in a cooling system, the cooling system comprising an electric oil pump which is disposed outside a case to store a vehicle driving motor and which circulates the cooling oil in the case through the motor, an outside air temperature sensor which detects an outside air temperature, and an oil temperature sensor which detects an oil temperature of the cooling oil in the case, the electric oil pump and the case being connected by an external pipe outside the case,

the method comprising permitting the actuation of the electric oil pump in one of

a first case where the oil temperature detected by the oil temperature sensor is equal to or greater than a first threshold and where the outside air temperature detected by the outside air temperature sensor is equal to or greater than a second threshold,

a second case where the outside air temperature is less than the second threshold and where the oil temperature is equal to or greater than a third threshold higher than the first threshold, and

a third case where the oil temperature is less than the first threshold and where the outside air temperature is equal to or greater than a fourth threshold higher than the second threshold.

6. The operation method of the electric oil pump according to claim 5, wherein

the actuation of the electric oil pump is continued without a judgment of the abnormality of the electric oil pump when the electric oil pump is not activated by an activation instruction for the electric oil pump in the second case and the third case.

7. A cooling system comprising:

an electric oil pump which circulates cooling oil;

an outside air temperature sensor which detects an outside air temperature;

an oil temperature sensor which detects an oil temperature of the cooling oil; and

a controller which includes a CPU and which judges permission for the actuation of the electric oil pump,

wherein the CPU of the controller executes an electric oil pump actuation permitting program to permit the actuation of the electric oil pump in one of

a first case where the oil temperature detected by the oil temperature sensor is equal to or greater than a first threshold and where the outside air temperature detected by the outside air temperature sensor is equal to or greater than a second threshold,

a second case where the outside air temperature is less than the second threshold and where the oil temperature is equal to or greater than a third threshold higher than the first threshold, and

a third case where the oil temperature is less than the first threshold and where the outside air temperature is equal to or greater than a fourth threshold higher than the second threshold.