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US 7,243,620 B2Granted
Liquid-cooling device for internal combustion engine
AssigneeDenso Corporation
InventorEizo Takahashi
Life of this patent
Estimating the term…
Abstract
A head cooling path diverges from a backflow path at a position between a radiator and a thermostat and is connected with a cylinder head of an engine by bypassing a cylinder block of the engine. A pump circulates the cooling water through the head cooling path, to the cylinder head, when the engine is operated at a high load and/or a vehicle is in a rapid acceleration, so that sufficiently cooled cooling water is supplied directly to the cylinder head.
Claims19
A liquid-cooling device for an internal combustion engine, comprising:
- a radiator for cooling down cooling liquid for a liquid-cooling type internal combustion engine, by means of heat exchange between the cooling liquid and air;
- an inflow path for guiding the cooling liquid from a cylinder head of the engine into the radiator;
- a backflow path for guiding the cooling liquid cooled down by the radiator into a cylinder block of the engine;
- a bypass connected with the inflow path and the backflow path, for making the cooling liquid bypass the radiator;
- a liquid temperature controlling means installed at a junction of the bypass and the backflow path, for controlling temperature of the cooling liquid entering the cylinder block by adjusting a ratio between amounts of flows of the cooling liquid from the backflow path and from the bypass;
- a first circulation means installed at a downstream of the liquid temperature controlling means for circulating the cooling liquid in accordance with a revolution of the engine;
- a controller for controlling an operation of the engine;
- a head cooling path diverging from the backflow path at a position between the radiator and the liquid temperature controlling means, for guiding the cooling liquid into the cylinder head;
- and
- a second circulation means independently operated of the first circulation means and circulating the cooling liquid through the head cooling path, wherein
- the controller controls the operation of the second circulation means.
8 more elements
A liquid-cooling device for an internal combustion engine, comprising:
- a radiator for cooling down cooling liquid for a liquid-cooling type internal combustion engine, by means of heat exchange between the cooling liquid and air;
- an inflow path for guiding the cooling liquid from a cylinder head of the engine into the radiator;
- a backflow path for guiding the cooling liquid cooled down by the radiator into a cylinder block of the engine;
- a head cooling path diverging from the backflow path, for guiding the cooling liquid into the cylinder head by bypassing the cylinder block;
- a first circuit comprising the cylinder block, the cylinder head, the inflow path, the radiator, and the backflow path;
- a second circuit comprising the cylinder head, the inflow path, the radiator, and the head cooling path;
- and
- circulation means for circulating the cooling fluid solely through the first circuit when an additional cooling capability for the cylinder head is not required, and for circulating the cooling liquid through the second circuit in addition to circulating the cooling liquid through the first circuit when the additional cooling capability of the cylinder head is required.
5 more elements
A liquid-cooling device for an internal combustion engine for a vehicle, comprising:
- a radiator for cooling down cooling liquid for a liquid-cooling type internal combustion engine, by means of heat exchange between the cooling liquid and air;
- an inflow path for guiding the cooling liquid from a cylinder head of the engine into the radiator;
- a backflow path for guiding the cooling liquid cooled down by the radiator into a cylinder block of the engine;
- a head cooling path diverging from the backflow path, for guiding the cooling liquid into the cylinder head by bypassing the cylinder block;
- a first circuit comprising the cylinder block, the cylinder head, the inflow path, the radiator, and the backflow path;
- first circulation means provided in the first circuit for circulating the cooling liquid in the first circuit;
- a second circuit comprising the cylinder head, the inflow path, the radiator, and the head cooling path;
- and
- second circulation means provided in the second circuit for circulating the cooling liquid through the second circuit, independently from the operation of the first circulation means, when the temperature of the cooling liquid flowing out from the cylinder head is higher than a predetermined value.
6 more elements
Dependencies are inferred from the claim text.