High pressure co-rail diesel engine control system with non-sensor automatic cetane number monitoring function
A diesel engine, cetane number technology, used in engine control, machine/engine, electrical control, etc., can solve problems such as temporarily inapplicability, poor flammability, and expensive measurement
Inactive Publication Date: 2011-01-12
广东戈兰玛汽车系统有限公司
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Problems solved by technology
When the cetane number is relatively small, the fuel is heavy, the combustibility is poor, and the ignition delay is long
Therefore, if the corresponding closed-loop feedback compensation control can be performed on the engine according to the cetane number, the influence of the cetane number on the engine's operating performance will be reduced or even eliminated.
For closed-loop control, real-time monitoring of cetane number is helpful, but direct measurement is expensive and not applicable
Method used
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[0009] In practical systems, both gasoline and diesel engines have acceleration sensors to measure engine knock. The signal of the acceleration sensor can be directly used for the automatic real-time detection of the cetane number, without the need of a special sensor to directly measure the cetane number. Usually a knock sensor can detect the vibration when each cylinder of the engine ignites and burns. Since the opening and closing of the cylinder valve will also cause the engine body to vibrate, the control system must judge in terms of time when the valve is opened and closed, and when is the vibration caused by the sudden start of combustion. So get the signal from the knock sensor in the right time window. There is usually other noise in the signal, so filtering is essential. Since the vibration frequencies of different engines are different, the control system uses band-pass filters with different band-pass frequencies to obtain the required vibration signals. This s...
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The invention relates to a cetane number high pressure common rail diesel engine control system which can automatically monitor without a sensor. The system consists of an electronic control unit for fuel oil injection, a knock signal receiving device, a cylinder body vibration signal filtering processing device, an engine working state change signal processing device, a firing point observer, a cetane number comparison circuit, an engine fuel oil control compensating circuit, an engine fuel oil closed loop control circuit and an electromagnetic valve. When the engine is at work, the control system obtains the signal of cylinder vibration intensity from the knock sensor at the proper time of the cylinder fuel oil burning, the cetane tested number can be indirectly obtained by standard deviation calculation of the filtered cylinder vibration intensity, and then the fuel oil injection time of the high pressure common rail diesel engine control system can be processed by closed loop feedback compensation control according to the cetane number, the engine load change, the engine rotating speed change, the engine exhaust discharge condition and other factors of that time, thus greatly enhancing the work performance of the engine.
Description
technical field [0001] The invention relates to a sensorless automatic monitoring of high pressure common rail diesel engine control. Background technique [0002] The combustion point of the fuel in the diesel engine cylinder is not determined by the ignition spark, but by the pressure, temperature, fuel injection time and fuel characteristics in the cylinder. The fuel injection time is precisely controlled by the controller, and the pressure and temperature in the cylinder can be measured or estimated by many methods, but the fuel characteristics are difficult to determine. Cetane plays an important role in fuel properties. Different cetane numbers have different cylinder light-off times, so fuel consumption, emissions and engine power will be affected, and it will also affect the stability of engine operation. In the case of low engine speed and low load, the cetane number has a greater impact on the engine running stability. The cetane number of diesel oil varies grea...
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IPC IPC(8): F02D41/30F02D41/14
Inventor 刘贻樟
Owner 广东戈兰玛汽车系统有限公司