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Diesel engine oxidation catalyst converter temperature-sensing control system

A technology of oxidation catalyst and temperature sensor, which can be used in the diagnosis device of exhaust gas treatment device, machine/engine, mechanical equipment, etc., and can solve problems such as guaranteeing accuracy

Inactive Publication Date: 2007-10-17
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since temperature sensors operate over a large operating range (eg -40°C to 800°C), it has traditionally been difficult to guarantee accuracy over this entire range

Method used

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  • Diesel engine oxidation catalyst converter temperature-sensing control system
  • Diesel engine oxidation catalyst converter temperature-sensing control system

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Embodiment Construction

[0013] The following description of preferred embodiments is merely exemplary in nature and is in no way intended to limit the invention and its application or uses. For purposes of clarity, the same reference numerals have been used in the drawings to designate similar elements. As used herein, "module" refers to an application-specific integrated circuit (ASIC), an electronic circuit, a processor (shared, dedicated, or group) and memory that executes one or more software or firmware programs, combinational logic circuits, and and / or other suitable components that provide the required functionality.

[0014] Referring now to FIG. 1 , an exemplary vehicle 10 is shown that includes an engine 12 and an exhaust treatment system 18 , wherein the engine 12 drives a transmission 14 through a coupling device 16 (eg, clutch, torque converter). More specifically, air is drawn into the intake manifold 20 through the throttle valve 22 . An intake manifold 20 distributes air to cylinder...

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Abstract

A temperature sensor reasonability control system, which is used for an exhaust processing system with an oxidation catalysis device, the temperature sensor reasonability control system comprises an inlet temperature sensor for the oxidation catalysis device producing inlet temperature signal and an outlet temperature sensor for the oxidation catalysis device producing outlet temperature signal. When the exhaust temperature is in the threshold range, the control module is to decide that whether the difference value between the inlet temperature signal and the outlet temperature signal is less than the threshold of the difference value.

Description

technical field [0001] The present invention relates to engine exhaust treatment systems, and more particularly to temperature sensor diagnostics for exhaust treatment systems including diesel oxidation catalysts (DOCs). Background technique [0002] A diesel engine is an internal combustion engine that combusts a mixture of air and fuel to reciprocally drive a piston slidably provided in a cylinder to generate drive torque. Diesel engines are generally more efficient than gasoline engines due to the higher compression ratio of the diesel combustion process and the higher energy density of diesel. As a result, a diesel engine will generally achieve better mileage than a gasoline engine of the same size. Automakers incorporate emission control devices into exhaust treatment systems in order to reduce emissions. [0003] One example of an exhaust treatment device includes a diesel oxidation catalyst (DOC). A DOC is an exhaust gas flow-through device comprising a honeycomb s...

Claims

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Application Information

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IPC IPC(8): F01N11/00
CPCY02T10/47Y02T10/40
Inventor C·何R·B·杰斯J·托尔斯马G·施J·L·德莱昂K·萨库莫托
Owner GM GLOBAL TECH OPERATIONS LLC