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Wide scope oxygen sensor aging monitoring system for vehicle and fault diagnosis method

An oxygen sensor and fault diagnosis technology, which is applied in the diagnosis device of the exhaust treatment device, engine control, machine/engine, etc., can solve the problems of inability to distinguish the degree of richness or leanness of the mixture, and the difficulty of aging diagnosis of the wide-area oxygen sensor. , to achieve the effect of aging monitoring and diagnosis

Active Publication Date: 2017-06-13
CHINA FIRST AUTOMOBILE
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Problems solved by technology

[0003] The disadvantage of the traditional oxygen sensor is that it can only sense whether the mixture is rich or lean, and cannot distinguish the degree of richness or leanness of the mixture
Different from the two-point oxygen sensor, the wide-area oxygen sensor does not show rich-lean dynamic change characteristics because it can accurately output the air-fuel ratio signal, which brings difficulties to the aging diagnosis of the wide-area oxygen sensor

Method used

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  • Wide scope oxygen sensor aging monitoring system for vehicle and fault diagnosis method
  • Wide scope oxygen sensor aging monitoring system for vehicle and fault diagnosis method
  • Wide scope oxygen sensor aging monitoring system for vehicle and fault diagnosis method

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Embodiment Construction

[0023] The technical solutions of the present invention are further explained and illustrated in the form of embodiments below.

[0024] The wide-area oxygen sensor aging monitoring system is attached figure 1 as shown,

[0025] It mainly includes ECU controller, wide-area oxygen sensor intelligent driver chip and wide-area oxygen sensor;

[0026] Among them, the wide-area oxygen sensor is used to provide the ECU with the current air density signal in the exhaust pipe, which is usually characterized by the excess air coefficient λ;

[0027]

[0028] The wide-area oxygen sensor intelligent driver chip is responsible for the acquisition and processing of the λ signal of the wide-area oxygen sensor and the heating of the wide-area oxygen sensor. Heating can make the oxygen sensor enter the normal operating temperature as soon as possible. The normal operating temperature of different types of wide-area oxygen sensors is different. Above 400°C, technicians can adjust the heat...

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Abstract

Provided are a wide scope oxygen sensor aging monitoring system for a vehicle and a fault diagnosis method. An engine and a sensor executor, an ECU and a wide scope oxygen sensor intelligent driver chip and the like thereof are utilized, and aging monitoring is performed on a wide scope oxygen sensor. The ECU is responsible for detecting and determining aging faults of the wide scope oxygen sensor, utilizing forced oscillation to compare lambda signals and lambda reference signals actually collected from the wide scope oxygen sensor, a minimum slope ratio between the lambda signals and the lambda reference signals is compared, and whether the wide scope oxygen sensor has the aging faults is determined according to the slope ratio. The system can accurately detect the aging faults of the wide scope oxygen sensor and is applicable to all vehicles where the wide scope oxygen sensor is installed.

Description

technical field [0001] It belongs to the technical field of on-board diagnostic systems. Background technique [0002] Oxygen sensors are used in emission control systems to maintain the engine's air-fuel ratio at the theoretical air-fuel ratio. The oxygen sensor measures the oxygen content in the engine exhaust and determines the oxygen concentration in the exhaust gas with reference to the oxygen concentration in the atmosphere. If there is a difference between the oxygen concentration in the exhaust gas and the oxygen concentration in the atmosphere, the oxygen sensor will generate a signal output. [0003] The disadvantage of the traditional oxygen sensor is that it can only sense whether the mixture is rich or lean, but cannot distinguish the degree of richness or leanness of the mixture. When the air-fuel ratio fluctuates near the theoretical air-fuel ratio, the voltage of the oxygen sensor will jump from high to low. In the field of low-emission applications, the w...

Claims

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Application Information

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IPC IPC(8): F02D21/08F01N11/00
CPCF01N11/007F01N2550/20F01N2560/025F02D21/08Y02T10/40
Inventor 颜松孙鹏远
Owner CHINA FIRST AUTOMOBILE
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