Crankshaft signal flow processing method and device based on state machine
A processing method and state machine technology, applied to devices, mechanical equipment, engine components, etc. that use electric/magnetic methods, to achieve low cost and improve reliability
Active Publication Date: 2018-01-30
WUXI WEIFU HIGH TECH CO LTD
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Problems solved by technology
However, none of the existing published methods and devices can address the above-mentioned problems to achieve a comprehensive solution design or a systematic and reasonable processing state flow design for the crankshaft signal processing process.
Method used
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[0074] Taking an electronically controlled diesel engine and a 60-2 crankshaft signal plate as an example to describe the specific implementation, the total number of teeth is 60, and the number of missing teeth is 2. The falling edge of the square wave is used as the trigger edge of the signal.
[0075] Before the engine starts, the system enters the pause state after initialization. Such as Figure 6 Shown is the timing diagram of the crankshaft signal under the operating conditions of the engine at start-up and after start-up. The moment the engine starts, the ECU gets the start signal from the key switch, and the state machine leaves the pause state, but the hardware does not capture the valid and credible falling edge of the crankshaft signal, so it is in state A of waiting for the signal edge.
[0076] When a falling edge is captured, enter the debounce state B and set the debounce time t' to prevent the signal waveform from being unstable due to low speed.
[0077] A...
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The invention relates to a crankshaft signal flow type processing method and device based on a state machine. The processing method is characterized in including: (1), electrifying an engine through a key and enabling the engine in a standby state, and promoting the state machine to enter a pause state; (2), starting an engine, enabling the engine to enter a signal edge waiting state from the pause state, and detecting crankshaft signal edges; (3), after detecting the crankshaft signal edges, entering a jitters elimination state; (4), after jitters elimination, promoting the state machine to enter a first signal edge state after neglecting jitters elimination; (5), detecting signal edges, and entering a state neglecting multiple signal edges; (6), when the number of signal edges obtained in the state, recorded by a counter in an ECU is larger than or equal to the number of set neglected signal edges, entering a missing tooth waiting state; and (7), when a missing tooth is found for the first time, entering a missing tooth finding state, and finally outputting crankshaft signal feature parameters, such as single-tooth tooth width, tooth number, rotating angle and rotating speed. The crankshaft signal flow type processing method and device realize the reasonable, accurate and efficient operation and output of crankshaft signals and improve the state judgment reliability of the crankshaft signals.
Description
technical field [0001] The invention relates to a state machine-based crankshaft signal processing method and device, in particular to a state machine-based electronically controlled diesel engine crank signal flow processing method and a crank signal acquisition device, which belong to the electromechanical system of the diesel engine electronic control system. field of control technology. Background technique [0002] The crankshaft signal sensor is one of the most important sensors in the electronic control system of the diesel engine, which is used to detect the angular displacement or rotational speed of the crankshaft. Engine crankshaft signal plate machining errors, signal errors caused by signal plate contamination, occasional high-frequency signal interference, crankshaft actual speed transients (normal temperature / low temperature start, random acceleration / deceleration, uneven work of a single cylinder), etc. , can have a great influence on the stability and relia...
Claims
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IPC IPC(8): F02D41/06F02B77/08G01P3/44
Inventor 杨建川杨晓卢振涛秦飞
Owner WUXI WEIFU HIGH TECH CO LTD