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Method and system for exhaust heat exchanger diagnostics

  • US 10,487,782 B2
  • Filed: 03/06/2018
  • Issued: 11/26/2019
  • Est. Priority Date: 10/18/2016
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • diverting engine exhaust for a turbo-charged direct injection engine, via a diverter valve of a heat exchange system, from downstream of an exhaust catalyst and downstream of a turbocharger turbine into a heat exchanger in an exhaust bypass; and

    indicating degradation of the heat exchange system based a first exhaust temperature and an exhaust pressure estimated upstream of the heat exchanger, a second exhaust temperature estimated downstream of the heat exchanger, and a temperature of coolant circulating through the heat exchanger sensed by a temperature sensor, the coolant returned to the engine or a heater core from the heat exchanger.

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