Patent ID: 8959904
Filing Date: 2015-02-24
Classification: F01N,F01P,Y02T

Abstract:
1. A vehicle comprising: an engine; an exhaust heat recovery system for the engine, the system having an exhaust gas heat exchanger, a first coolant temperature sensor positioned upstream of the exhaust gas heat exchanger, and a second coolant temperature sensor positioned downstream of the exhaust gas heat exchanger; and a controller configured to (i) generate a signal to control exhaust gas flow through the exhaust gas heat exchanger, and (ii) generate a diagnostic code based on the signal, a rate of change of coolant temperature, and another rate of change of coolant temperature, wherein the rate is determined using a first signal received from the first sensor, and a second signal received from the first sensor after a predetermined time period, and wherein the another rate is determined using a third signal received from the second sensor, and a fourth signal received from the second sensor after the predetermined time period.