Engine cooling system

Inactive Publication Date: 2016-08-11
ISUZU MOTORS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The engine cooling system described in this patent uses compressed air to improve the performance of the Rankine cycle, which helps improve fuel economy. This is achieved by heating up the evaporator in the cycle with higher temperature air than conventional cooling water. Additionally, the use of compressed air eliminates the need for an intercooler, reducing vehicle weight.

Problems solved by technology

However, when such a Rankine cycle is employed on a vehicle, the vehicle weight is increased.
This may counterbalance the effect of improving the fuel economy.
Moreover, since the temperature of the engine-main-body cooling water is merely around 100° C., it is only possible to obtain a relatively small temperature difference between the flows of cooling water.
Hence, it is difficult to have the Rankine cycle exhibit a sufficient performance to further improve the fuel economy.

Method used

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Embodiment Construction

[0011]Hereinafter an embodiment of the present invention will be described with reference to the drawing. FIG. 1 shows an engine cooling system according to the embodiment of the present invention.

[0012]This engine cooling system includes a sub-radiator 2 and a radiator 3 disposed in this order from a front surface of a vehicle 1. The sub-radiator 2 and the radiator 3 are configured to perform air-cooling by utilizing vehicle-speed wind and cooling wind of a cooling fan (not shown) when the vehicle 1 is running or idling.

[0013]In a diesel engine 4, which is a cooling target of the engine cooling system, air A is drawn to an intake passage 5, passes through an air cleaner not shown, and is compressed by a compressor 7 of a turbocharger 6. Then, compressed air 8 thus obtained is supplied to an engine main body 10 via an intake manifold 9.

[0014]The compressed air 8 supplied to the engine main body 10 is mixed with a fuel and burned, thereby generating a thermal energy. Then, a burned g...

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Abstract

An engine cooling system decreases vehicle weight caused by employing a Rankine cycle, makes it possible to improve the performance of the Rankine cycle, and includes a coolant that circulates through a cooling pump, an evaporator, an expander, and in a condenser in this order; an engine main body in which a turbocharger is arranged in an intake passage; and a radiator through which cooling water for the engine main body circulates. A sub-radiator is installed parallel to the radiator; air that is compressed by the turbocharger is used as a heating source for the evaporator; and outlet-side cooling water of the sub-radiator is used as a cooling source for the condenser.

Description

TECHNICAL FIELD[0001]The present invention relates to an engine cooling system, and more specifically relates to an engine cooling system including a Rankine cycle with an improved performance while suppressing an increase in vehicle weight caused by employing the Rankine cycle.BACKGROUND ART[0002]Conventionally, there has been a proposal to employ a Rankine cycle in a vehicle in order to recover waste heat from an engine and thereby improve the fuel economy, as described in, for example, Japanese patent application Kokai publication No. 11-51582 (Patent Literature 1). For example, engine-main-body cooling water heated by an engine main body is used as a heating source of a Rankine cycle while intercooler cooling water cooled by a sub-radiator is used as a cooling source, so that a temperature difference between these flows of cooling water can be recovered as a power energy in a compressor (turbine).[0003]However, when such a Rankine cycle is employed on a vehicle, the vehicle weig...

Claims

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Application Information

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IPC IPC(8): F01P9/06F01P3/18
CPCF01P9/06F01P3/18F01P2003/001F05D2220/40F01P7/165F01P2060/16F01K23/065F01K23/10F01P3/20F01P9/02F01P2060/02F01P2003/185B60Y2304/03F01P2050/22
InventorHONDA, TAKU
OwnerISUZU MOTORS LTD