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Exhaust gas recirculation control device for engine with dual cooling system

  • US 5,924,412 A
  • Filed: 10/03/1997
  • Issued: 07/20/1999
  • Est. Priority Date: 10/07/1996
  • Status: Expired due to Fees
First Claim
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1. An exhaust gas recirculation control device for an engine with a dual cooling system, the dual cooling system having a head-side cooling water passage formed in a cylinder head, through which a cooling water can be circulated, and a block-side cooling water passage formed in a cylinder block, through which a cooling water can be circulated, in which a block-side circulation can be stopped without stopping a head-side circulation, the device comprising:

  • a temperature sensor for detecting a temperature of the cooling water circulating the head-side passage (THW); and

    an exhaust gas recirculation system for supplying an EGR gas to the engine, the exhaust gas recirculation system performing the supply of the EGR gas when the cooling water temperature (THW) is higher than a predetermined temperature (THE), and stopping the supply of the EGR gas when the cooling water temperature (THW) is lower than the predetermined temperature (THE), wherein the predetermined temperature when the block-side circulation is stopped (THL) is set to be different from the predetermined temperature when the block-side circulation is performed (THH).

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