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Method to control and diagnose an exhaust gas heat exchanger

A heat exchanger and exchanger technology, applied in electrical control, engine control, fuel injection control, etc., can solve the problems of cooling liquid boiling time and lag, and achieve the effect of improving fuel economy and reducing emissions

Active Publication Date: 2013-12-04
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing systems have utilized a strategy of passive control of the EGHX valve whereby the thermostat directly moves the actuator for the EGHX valve, which can result in coolant boiling or a time lag in the system

Method used

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  • Method to control and diagnose an exhaust gas heat exchanger
  • Method to control and diagnose an exhaust gas heat exchanger
  • Method to control and diagnose an exhaust gas heat exchanger

Examples

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Embodiment Construction

[0038] As required, specific embodiments of the present invention are disclosed herein, however, it is to be understood that the disclosed embodiments are merely exemplary and may be embodied in various and alternative forms. The figures are not necessarily to scale, some features may be exaggerated or minimized to show details of particular components. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a representative basis for teaching one skilled in the art to variously employ the present invention.

[0039] exist figure 1 In , an embodiment of a hybrid electric vehicle (HEV) 10 is schematically shown. In this drivetrain configuration, there are two power sources 12, 14 connected to the drivetrain: 12 is a combination of engine and generator subsystems connected to each other using planetary gear sets; 14 is the electric drive system (motor, generator machine, battery subsystem). The battery subsys...

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PUM

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Abstract

Provided is a method for controlling and diagnose an exhaust gas heat exchanger. The method includes measuring air mass flow, engine coolant temperature (ECT), exhaust gas temperature (EGT), heat exchanger coolant temperature (HECT), and engine speed; and operating a valve to selectively provide exhaust gas flow through the exhaust gas heat exchanger based on air mass flow, ECT, EGT, HECT, and engine speed. A vehicle has an engine and an exhaust heat recovery system with an exhaust gas heat exchanger and a valve configured to control exhaust gas flow. A controller for the vehicle is configured to (i) measure air mass flow, ECT, EGT, HECT, and engine speed, and (ii) operate the valve to selectively provide exhaust gas flow through the exhaust gas heat exchanger based on air mass flow, ECT, EGT, HECT, and engine speed.

Description

technical field [0001] Various embodiments relate to fault diagnosis and control of an exhaust gas heat exchanger of an internal combustion engine. Background technique [0002] Exhaust Gas Heat Exchangers (EGHX) are used to recover heat from the exhaust gases of internal combustion engines to heat the engine coolant. Some systems employ a passive control strategy that utilizes a thermostat to move a valve or actuator to control exhaust gas recirculation. [0003] In hybrid vehicles, the exhaust gas heat exchanger also provides earlier engine shutdown. An exhaust gas bypass line may be provided to allow the exhaust gas to flow around the heat exchanger and bypass the coolant. Exhaust flow is directed by the EGHX valve through the EGHX or bypass line. EGHX valves generally do not have position sensors. Existing systems have utilized a strategy of passive control of the EGHX valve, whereby the thermostat directly moves the actuator for the EGHX valve, which can result in c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/22
CPCF01N9/00F01N2900/1404F01N2240/02F02D41/1446F02D41/22F02D2041/0075F01P2025/52F01N2410/03F01P2025/44F01N5/02Y02T10/47Y02T10/16F01P7/14F02D41/18Y02T10/12Y02T10/40
Inventor 安吉娜·弗南德·珀拉斯道格拉斯·雷蒙德·马丁
Owner FORD GLOBAL TECH LLC
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