Method for achieving vehicle limp by camshaft signals during crankshaft signal failure and camshaft signal acquiring device thereof
A technology of signal failure and acquisition device, applied in fuel injection control, engine control, machine/engine, etc., can solve the problem of not having crankshaft signal, etc., and achieve the effect of improving reliability and safety
Active Publication Date: 2016-04-20
WUXI WEIFU HIGH TECH CO LTD
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Problems solved by technology
However, in the method and device announced now, for the commonly used z+1 tooth type camshaft signal wheel, there is no function of using the camshaft signal to realize the vehicle when the crankshaft signal has failed before starting, and the crankshaft signal fails suddenly under operating conditions. Limp process design and specific algorithm design
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[0031] The present invention will be further described below with reference to the drawings and embodiments.
[0032] Such as figure 1 Shown is a camshaft signal acquisition device, which includes: a camshaft signal wheel 101, a camshaft signal sensor 102, an engine wiring harness 103, and an engine electronic control unit ECU104. The camshaft signal sensor 102 senses the rotation of the camshaft signal wheel 101, and the camshaft signal sensor 102 is connected to the engine electronic control unit 104 through the engine harness 103. The camshaft signal wheel is of z+1 tooth type, z tooth is equal to 105 teeth, and 1 tooth is multi-tooth 106. The multi-tooth 106 divides two adjacent equal-dividing teeth 105 into two segments, wherein the ratio of the length of the longer segment to the shorter segment is greater than two.
[0033] In order to better describe the use of the method and device of the present invention, a four-cylinder, four-stroke electronically controlled diesel eng...
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The invention discloses a method for achieving vehicle limp by camshaft signals during crankshaft signal failure and a camshaft signal acquiring device thereof. According to the method, after crankshaft signal failure, the camshaft signals can be processed through software program parameter matching and calibration and process design. An engine relative phase is determined and an engine rotating speed is computed by the camshaft signals to control fuel injection, so that vehicle limp is achieved. The method for achieving vehicle limp by the camshaft signals during crankshaft signal failure and the camshaft signal acquiring device thereof have the advantages that modification on engine body components is unneeded, only software program parameter and process design is needed, cost is low, and the method can be popularized to various electronic-control diesel engine types; the crankshaft signal failure in an unstart state and in an operation condition state can be considered, so that vehicle limp is achieved by the camshaft signals; through camshaft signal processing process design and failure monitoring after the crankshaft signal failure, safety of a diesel engine electronic-control system limp mode is improved.
Description
Technical field [0001] The invention relates to electromechanical control technology of a diesel engine electronic control system, in particular to a method for realizing vehicle limp by using a camshaft signal when a crankshaft signal fails, and a camshaft signal acquisition device thereof. Background technique [0002] Crankshaft position sensor and camshaft position sensor are important sensors in the diesel engine electronic control system. The crankshaft position sensor is used to detect the angular displacement of the crankshaft and calculate the engine speed. The camshaft position sensor is used for engine phase confirmation and cylinder judgment, and is the basic signal for diesel engine fuel injection / ignition control. [0003] When the crankshaft signal fails, the electronic control system uses the camshaft signal to realize the limp function of the vehicle for safe vehicle operation. However, in the method and device now published, for the commonly used z+1 tooth type ...
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IPC IPC(8): F02D41/22F02D41/04
CPCF02D41/04F02D41/042F02D41/222F02D2041/227
Inventor 杨建川杨晓石明孙明超
Owner WUXI WEIFU HIGH TECH CO LTD