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Fault Diagnosis Method of Speed ​​Sensor

A speed sensor and fault diagnosis technology, applied in the direction of machines/engines, mechanical equipment, engine components, etc., can solve the problems of spare parts waste, increase maintenance cost and time, improve accuracy, reduce cost and time, and realize simple Effect

Active Publication Date: 2018-12-25
UNITED AUTOMOTIVE ELECTRONICS SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This makes the normal speed sensor to be repaired or replaced, which increases repair cost and time, and leads to waste of spare parts

Method used

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  • Fault Diagnosis Method of Speed ​​Sensor
  • Fault Diagnosis Method of Speed ​​Sensor
  • Fault Diagnosis Method of Speed ​​Sensor

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0035] see image 3 , which is the first embodiment of the fault diagnosis method for the speed sensor of the present application, including the following steps:

[0036] Step 3.1: After the vehicle is powered on, the on-board diagnostic system starts to monitor four signals in real time, namely the engine speed signal, the camshaft phase signal, the intake manifold pressure (or the intake air volume of the engine) and the battery voltage. At this time, the engine speed signal, camshaft phase signal, and engine air intake are all 0 or not output, the intake manifold pressure is the ambient pressure value, and the battery voltage is the rated voltage value.

[0037] In step 3.2, the on-board diagnostic system will enter step 3.3 only if it detects that the pressure of the intake manifold has dropped (or the intake air volume of the engine has increased) and the voltage of the battery has dropped. At this time, the on-board diagnostic system believes that the vehicle has entere...

no. 2 example

[0045] see Figure 4 , which is the second embodiment of the fault diagnosis method of the speed sensor of the present application, including the following steps:

[0046] Step 4.1: After the vehicle is powered on, the on-board diagnostic system starts to monitor four signals in real time, namely engine speed signal, camshaft phase signal, intake manifold pressure (or engine air intake), and battery voltage. At this time, the engine speed signal, camshaft phase signal, and engine air intake are all 0 or not output, the intake manifold pressure is the ambient pressure value, and the battery voltage is the initial voltage value.

[0047] In step 4.2, the OBD system only enters step 4.3 when it detects that the pressure of the intake manifold has dropped (or the intake air volume of the engine has increased) and the voltage of the battery has dropped. At this time, the on-board diagnostic system believes that the vehicle has entered the stage where the starter motor drives the e...

no. 3 example

[0055] see Figure 5 , which is the third embodiment of the fault diagnosis method of the speed sensor of the present application, including the following steps:

[0056] In step 5.1, after the vehicle is powered on, the on-board diagnostic system starts to monitor the engine speed signal and the camshaft phase signal in real time, and at the same time monitor at least one of the intake manifold pressure, engine intake air volume, and battery voltage.

[0057] In step 5.2, when the OBD system detects that the intake manifold pressure has dropped, or the intake air volume of the engine has increased, or the battery voltage has dropped, it will enter step 5.3. At this time, the on-board diagnostic system believes that the vehicle has entered the stage where the starter motor drives the engine to run or the engine runs on its own.

[0058] Step 5.3. At the same time, if the OBD system also detects that the engine speed signal is 0 (or not output) and the camshaft phase signal is...

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Abstract

The invention discloses a fault diagnosis method for a rotating speed sensor. After a vehicle is powered on, a vehicle-mounted diagnostic system starts to monitor engine rotating speed signals, camshaft phase signals, intake manifold pressure and engine air inflow and / or the voltage of a storage battery in real time. At any time, if the engine rotating speed signals detected by the vehicle-mounted diagnostic system are not zero, the rotating speed sensor is judged to be normal. After or when an auxiliary judgment condition is true, if the detected engine rotating speed signals are zero and the detected camshaft phase signals are not zero, the rotating speed sensor is judged to break down. According to the fault diagnosis method, the accidental alarm of an existing diagnosis method can be avoided to a large degree, and the accuracy of the fault diagnosis on the rotating speed sensor is improved.

Description

technical field [0001] The present application relates to a fault diagnosis method for a rotational speed sensor in an engine of a motor vehicle. Background technique [0002] The engine speed signal of the vehicle refers to the crankshaft speed signal, which is obtained by a speed sensor (also called a position sensor) arranged on the crankshaft. This signal is a basic parameter necessary for engine operation. If the signal is lost, it will cause the engine to run abnormally, the engine in the running state may stall, and the engine in the stopped state may not be able to start. In view of the fact that the engine speed signal has an important impact on the vehicle system, it is necessary to monitor the speed sensor. Once the speed sensor is found to be faulty, an alarm signal will be sent. [0003] see figure 1 , the fault diagnosis method of existing rotational speed sensor comprises the following steps: [0004] Step 1.1, after the vehicle is powered on, the on-boar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02B77/08
Inventor 赵燕陈伟王帅朱韬谢悦孝习纲郭辉李君张磊磊
Owner UNITED AUTOMOTIVE ELECTRONICS SYST