Engine cooling system
First Claim
1. A cooling system for a liquid cooled internal combustion engine including a cylinder block having a cooling jacket and a cylinder head mounted on the cylinder block and having a cooling jacket connected with the cooling jacket of the cylinder block for serial coolant flow through the block and the head from a first coolant inlet in the block to a coolant outlet in the head;
- the improvement comprising;
a second coolant inlet connected with the cooling jacket of the cylinder head;
a controllable flow water pump connected between the coolant outlet and the coolant inlets to pump coolant at variable flow rates through the system;
a heat exchanger connected to discharge excess heat from the coolant leaving the outlet;
the heat exchanger connected with the water pump and the water pump connected with the first coolant inlet in the block for circulating liquid coolant through the system; and
a diverter valve connected between the pump and the first and second coolant inlets to the block and head respectively, the diverter valve being operable to modulate coolant flow from the pump between a position of full coolant flow to the first coolant inlet to the cylinder block and a position of full coolant flow to the second coolant inlet to the cylinder head.
13 Assignments
0 Petitions
Accused Products
Abstract
A cooling system has a diverter valve to selectively control the flow of coolant through an internal combustion engine having a cylinder block with a cooling jacket and a cylinder head mounted on the block with a cooling jacket. A controller, responsive to the temperature of the block and the head, controls the diverter valve and a water pump to provide adequate coolant flow through the head and the block as needed to maintain optimal operating temperatures. After the engine is shut off, the controller continues to operate the water pump and a cooling fan to continue to cool the engine for a period of time.
103 Citations
21 Claims
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1. A cooling system for a liquid cooled internal combustion engine including a cylinder block having a cooling jacket and a cylinder head mounted on the cylinder block and having a cooling jacket connected with the cooling jacket of the cylinder block for serial coolant flow through the block and the head from a first coolant inlet in the block to a coolant outlet in the head;
- the improvement comprising;
a second coolant inlet connected with the cooling jacket of the cylinder head;
a controllable flow water pump connected between the coolant outlet and the coolant inlets to pump coolant at variable flow rates through the system;
a heat exchanger connected to discharge excess heat from the coolant leaving the outlet;
the heat exchanger connected with the water pump and the water pump connected with the first coolant inlet in the block for circulating liquid coolant through the system; and
a diverter valve connected between the pump and the first and second coolant inlets to the block and head respectively, the diverter valve being operable to modulate coolant flow from the pump between a position of full coolant flow to the first coolant inlet to the cylinder block and a position of full coolant flow to the second coolant inlet to the cylinder head. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 21)
- the improvement comprising;
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13. A method for controlling a cooling system of a liquid cooled internal combustion engine including a cylinder block having a cooling jacket and a cylinder head mounted on the cylinder block and having a cooling jacket connected with the cooling jacket of the cylinder block for serial coolant flow through the block and the head from a first coolant inlet in the block and an outlet in the head, a second coolant inlet to the cylinder head coolant jacket, a controllable flow water pump connected between the coolant outlet and the coolant inlets to pump coolant through the system, a heat exchanger connected to discharge excess heat from the coolant leaving the outlet, and a diverter valve connected between the pump and the first and second coolant inlets, the method comprising the step of:
controlling coolant temperatures in the cylinder block and cylinder head by varying as needed the flow of coolant pumped through the system by the pump. - View Dependent Claims (14, 15, 16, 17, 18, 20)
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19. A method for cooling an engine after shutdown, the method comprising:
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reversing air flow of the cooling fan to draw cooler air past the engine to the heat exchanger, thereby cooling the engine with the passing air flow;
continuing coolant flow through the engine and heat exchanger for a period to maintain engine cooling after shutdown until coolant temperature is reduced to a desired value; and
using an electric variable speed pump for continuing the coolant flow.
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Specification