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Diesel timing control system based on state machine and time processing unit

A processing unit and state machine technology, applied in engine control, electrical control, fuel injection control, etc., can solve problems such as engine inoperability, shorten engine start-up time, etc., and achieve the effect of improving safety

Inactive Publication Date: 2011-03-30
FAW GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the problem that the engine cannot run when the crankshaft or the cam signal fails, improves the stability and robustness of the system, greatly shortens the starting time of the engine, and improves the safety, stability and reliability of the vehicle operation sex

Method used

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  • Diesel timing control system based on state machine and time processing unit
  • Diesel timing control system based on state machine and time processing unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] When the key switch is in the ON gear, the ECU is powered on, and the system enters the initial state of INIT. Within the set time, the crankshaft overtime fault will first occur, and the system enters the TIMEOUT state. When the key switch is in the START position, the motor drives the engine to rotate. Generally, the crankshaft signal is captured first, and when a valid crankshaft signal is found, it enters the POLLING state; when the cam captures a valid signal, it enters the VERIFY state; when the cam detects a gear increase , verify whether the crankshaft and cam signals are synchronized, if not, continue to wait, otherwise, the system enters the SYN synchronization state, at this time the engine phase management system establishes the engine phase, calculates the current cylinder number, performs engine fuel injection control, and enters SYN at this time state.

[0023] Embodiment 2: When the crankshaft signal is normal and the camshaft is faulty, the process of s...

Embodiment 2

[0024] When the key switch is in the ON gear, the ECU is powered on, and the system enters the initial state of INIT. When within the set time, the crankshaft overtime fault will occur first, and the system enters the TIMEOUT state at this time. When the key switch is in the START position, the motor drives the engine to rotate. Generally, the crankshaft signal is captured first. When a valid crankshaft signal is found, it enters the POLLING state. At this time, due to a camshaft failure, no valid camshaft signal is found, and the system enters the WAIT_CAM state. , within the set number of faults, the crankshaft and camshaft signals cannot be synchronized normally, and the timing system starts the test spray function. If the acceleration is greater than the set threshold, it means that the test spraying is successful, and the system enters the SYN state; otherwise, the system enters the WAIT_CAM state and starts the next test spraying. When the system is in the SYN state, th...

Embodiment 3

[0026] When the key switch is in the ON gear, the ECU is powered on, and the system enters the initial state of INIT. When within the set time, the crankshaft overtime fault will occur first, and the system enters the TIMEOUT state at this time. When the key switch is in the START position and the motor drives the engine to rotate, under normal circumstances the crankshaft signal is captured first, but at this time due to the crankshaft signal failure, no valid crankshaft signal is found, the system first finds a valid cam signal, and the system enters the WAIT_CRANK state. When the cam gear is increased, the system enters the CAM_PHASE_CHECK state. If the synchronization of the crankshaft and camshaft signals is not completed within the set time, the system enters the START_BACKUP state. The engine phase is established according to the camshaft signal, the engine cylinder number is calculated, and the engine injection is performed. Oil control, enter the BACKUP state at this ...

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Abstract

The invention relates to a diesel timing control system based on a state machine and a time processing unit (TPU). The system is characterized in that: a control mode is implemented by the following steps that: an engine is firstly started; when a first tooth increasing position found by a cam processing module precedes a first tooth missing position found by a crankshaft processing module, the engine immediately enters a single camshaft mode to control the running of the engine; when the first tooth missing position found by the crankshaft processing module precedes the first tooth increasing position found by the cam processing module, the engine immediately starts the single crankshaft mode; when the system finishes the synchronization of the crankshaft and the camshaft, the system can directly enter, or can be switched to a synchronous mode from the single crankshaft mode or the single cam mode; secondly, the engine normally runs, when crankshaft signals are interrupted or in failure, the engine is in a failure mode, the system can be seamlessly switched to the single camshaft mode. The system has the functions of rapid seamless switching of engine state and halting home, greatly improves the safety, stability and reliability of a vehicle during running.

Description

technical field [0001] The invention relates to a diesel engine timing control system based on a state machine and a time processing unit (TPU), which belongs to the timing control technology in the field of diesel engine high-pressure common rail electronically controlled fuel injection systems. Background technique [0002] The engine timing control system consists of modules such as engine phase management, engine synchronization, multiple fuel injection control, rail pressure control, crankshaft limp home, and camshaft limp home. [0003] The establishment of engine phase relationship is the basis of fuel injection. Its accuracy and reliability can directly affect the performance of the engine. During normal operation, the engine needs to input two signals of camshaft and crankshaft. If any one signal fails or is severely jammed, the engine will not be able to run. Contents of the invention [0004] The purpose of the present invention is to provide a diesel engine ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/38
Inventor 吕贵林郑岩刘时珍
Owner FAW GROUP