Cooling device for engine
First Claim
1. A cooling device adjusting a temperature of an engine, said engine being provided with a medium path allowing a cooling medium to flow therethrough, and said medium path being connected to a heat exchanger causing heat exchange with said cooling medium, comprising:
- a circulation unit circulating said cooling medium by receiving supply of electric power; and
a control unit controlling the electric power to be supplied to said circulation unit, whereinsaid control unit includesa setting unit setting a flow rate of said cooling medium to a set flow rate, in a cold state of said engine, based on a relation between heat exchange efficiency at said heat exchanger and the electric power at said circulation unit, the electric power corresponding to said flow rate, andan electric power control unit controlling said electric power such that said set flow rate is obtained.
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Accused Products
Abstract
An ECU executes a program including a step of, if an engine is not in a cold state, controlling electric power to be supplied to an electric water pump such that a flow rate requested at the engine is obtained, a step of, if the engine is in the cold state and a heater is not requested to operate, providing control such that the electric water pump is stopped, and a step of, if the engine is in the cold state and the heater is requested to operate, controlling the electric power to be supplied to the electric water pump such that the flow rate is set to the highest one of the flow rate requested at the engine, a flow rate requested at a heater core, and a flow rate requested at an exhaust heat recovery device.
29 Citations
19 Claims
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1. A cooling device adjusting a temperature of an engine, said engine being provided with a medium path allowing a cooling medium to flow therethrough, and said medium path being connected to a heat exchanger causing heat exchange with said cooling medium, comprising:
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a circulation unit circulating said cooling medium by receiving supply of electric power; and a control unit controlling the electric power to be supplied to said circulation unit, wherein said control unit includes a setting unit setting a flow rate of said cooling medium to a set flow rate, in a cold state of said engine, based on a relation between heat exchange efficiency at said heat exchanger and the electric power at said circulation unit, the electric power corresponding to said flow rate, and an electric power control unit controlling said electric power such that said set flow rate is obtained.
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2. A cooling device adjusting a temperature of an engine, said engine being provided with a medium path allowing a cooling medium to flow therethrough, and said medium path being connected to an exhaust heat recovery device provided at an exhaust manifold of said engine for recovering exhaust heat through heat exchange between exhaust gas of said engine and said cooling medium, comprising:
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a circulation unit circulating said cooling medium by receiving supply of electric power; and a control unit controlling the electric power to be supplied to said circulation unit, wherein said control unit includes a setting unit setting a flow rate of said cooling medium to a set flow rate, in a cold state of said engine, based on a relation between heat exchange efficiency at said exhaust heat recovery device and the electric power at said circulation unit, the electric power corresponding to said flow rate, and an electric power control unit controlling said electric power such that said set flow rate is obtained. - View Dependent Claims (3, 4, 8)
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5. A cooling device adjusting a temperature of an engine, said engine being provided with a medium path allowing a cooling medium to flow therethrough, and said medium path being connected to an exhaust heat recovery device provided at an exhaust manifold of said engine for recovering exhaust heat through heat exchange between exhaust gas of said engine and said cooling medium, comprising:
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a circulation unit circulating said cooling medium; and a control unit for controlling a flow rate of the cooling medium circulated by said circulation unit, wherein said control unit includes a setting unit setting said flow rate to a set flow rate, in a cold state of said engine, based on a comparison result between a warm-up state of said engine and an exhaust heat recovery state of said exhaust heat recovery device, and a flow rate control unit controlling said flow rate such that said set flow rate is obtained. - View Dependent Claims (6, 7)
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9. A cooling device adjusting a temperature of an engine, said engine being provided with a medium path allowing a cooling medium to flow therethrough, and said medium path being connected to a heat exchangers causing heat exchange with said cooling medium, comprising:
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circulation means for circulating said cooling medium by receiving supply of electric power; and control means for controlling the electric power to be supplied to said circulation means, wherein said control means includes setting means for setting a flow rate of said cooling medium to a set flow rate, in a cold state of said engine, based on a relation between heat exchange efficiency at said heat exchanger and the electric power at said circulation means, the electric power corresponding to said flow rate, and means for controlling said electric power such that said set flow rate is obtained. - View Dependent Claims (16)
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10. A cooling device adjusting a temperature of an engine, said engine being provided with a medium path allowing a cooling medium to flow therethrough, and said medium path being connected to an exhaust heat recovery device provided at an exhaust manifold of said engine for recovering exhaust heat through heat exchange between exhaust gas of said engine and said cooling medium, comprising:
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circulation means for circulating said cooling medium by receiving supply of electric power; and control means for controlling the electric power to be supplied to said circulation means, wherein said control means includes setting means for setting a flow rate of said cooling medium to a set flow rate, in a cold state of said engine, based on a relation between heat exchange efficiency at said exhaust heat recovery device and the electric power at said circulation means, the electric power corresponding to said flow rate, and means for controlling said electric power such that said set flow rate is obtained. - View Dependent Claims (11, 12)
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13. A cooling device adjusting a temperature of an engine, said engine being provided with a medium path allowing a cooling medium to flow therethrough, and said medium path being connected to an exhaust heat recovery device provided at an exhaust manifold of said engine for recovering exhaust heat through heat exchange between exhaust gas of said engine and said cooling medium, comprising:
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circulation means for circulating said cooling medium; and control means for controlling a flow rate of the cooling medium circulated by said circulation means, wherein said control means includes setting means for setting said flow rate to a set flow rate, in a cold state of said engine, based on a comparison result between a warm-up state of said engine and an exhaust heat recovery state of said exhaust heat recovery device, and means for controlling said flow rate such that said set flow rate is obtained. - View Dependent Claims (14, 15)
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17. A cooling device adjusting a temperature of an engine, said engine being provided with a medium path allowing a cooling medium to flow therethrough, and said medium path being connected to a radiator causing heat exchange with said cooling medium, comprising:
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an electric water pump circulating said cooling medium by receiving supply of electric power; and an electronic control unit controlling the electric power to be supplied to said electric water pump, wherein said electronic control unit sets a flow rate of said cooling medium to a set flow rate, in a cold state of said engine, based on a relation between heat exchange efficiency at said radiator and the electric power at said electric water pump, the electric power corresponding to said flow rate, and controls said electric power such that said set flow rate is obtained.
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18. A cooling device adjusting a temperature of an engine, said engine being provided with a medium path allowing a cooling medium to flow therethrough, and said medium path being connected to an exhaust heat recovery device provided at an exhaust manifold of said engine for recovering exhaust heat through heat exchange between exhaust gas of said engine and said cooling medium, comprising:
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an electric water pump circulating said cooling medium by receiving supply of electric power; and an electronic control unit controlling the electric power to be supplied to said electric water pump, wherein said electronic control unit sets a flow rate of said cooling medium to a set flow rate, in a cold state of said engine, based on a relation between heat exchange efficiency at said exhaust heat recovery device and the electric power at said electric water pump, the electric power corresponding to said flow rate, and controls said electric power such that said set flow rate is obtained.
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19. A cooling device adjusting a temperature of an engine, said engine being provided with a medium path allowing a cooling medium to flow therethrough, and said medium path being connected to an exhaust heat recovery device provided at an exhaust manifold of said engine for recovering exhaust heat through heat exchange between exhaust gas of said engine and said cooling medium, comprising:
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an electric water pump circulating said cooling medium; and an electronic control unit for controlling a flow rate of the cooling medium circulated by said electric water pump, wherein said electronic control unit sets said flow rate to a set flow rate, in a cold state of said engine, based on a comparison result between a warm-up state of said engine and an exhaust heat recovery state of said exhaust heat recovery device, and controls said flow rate such that said set flow rate is obtained.
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Specification