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Timing control system of diesel engine based on state machine and time processing unit (TPU)

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

Inactive Publication Date: 2011-03-09
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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  • Timing control system of diesel engine based on state machine and time processing unit (TPU)
  • Timing control system of diesel engine based on state machine and time processing unit (TPU)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: When the crankshaft and camshaft signals are normal, the engine start process:

[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.

Embodiment 2

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

[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...

Embodiment 3

[0025] Embodiment 3: When the camshaft signal is normal and the crankshaft is faulty, the process of starting the engine:

[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, t...

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Abstract

The invention relates to a timing control system of a diesel engine based on a state machine and a time processing unit (TPU), which is characterized in that a control mode is realized by the following steps: firstly, starting an engine; when a first tooth increasing position discovered by a cam processing module is prior to a first tooth decreasing position discovered by a crankshaft processing module, enabling the engine to be in a single camshaft mode instantly, and controlling the operation of the engine; when the first tooth decreasing position discovered by the crankshaft processing module is prior to the first tooth increasing position discovered by the camshaft processing module, enabling the engine to be in a single crankshaft mode instantly; when the system finishes the synchronization of the crankshaft and the camshaft, enabling the engine to be in a synchronous mode directly or enabling the engine to be switched to the synchronous mode from the single crankshaft mode or the single cam mode; secondly, enabling the engine to operate normally; when camshaft signals have interference or faults and the engine is in a fault mode, switching the engine to the single crankshaft mode by the system in a seamless way; and when crankshaft signals have interference or faults and the engine is in a fault mode, switching the engine to the single camshaft mode by the system in a seamless way. The invention has the functions of quickly switching the states of the engine in a seamless way, limping and the like, and greatly improves the safety, the stability and the reliability of vehicle operation.

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): F02D41/22F02D41/30
Inventor 吕贵林郑岩刘时珍
Owner FAW GROUP
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