Control system for natural gas/gasoline dual-fuel engine
A dual-fuel engine and control system technology, applied in engine control, electrical control, machine/engine, etc., can solve problems such as complex ECU hardware circuit structure, multiplication of stored codes, and large hardware circuit changes, so as to save hardware development costs , fewer modifications, and lower cost
Active Publication Date: 2013-08-07
CHONGQING CHANGAN AUTOMOBILE CO LTD
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AI Technical Summary
Problems solved by technology
The increased high-power driving circuit and power driver for driving the air nozzle will greatly change the original gasoline engine ECU hardware circuit, and the ECU hardware circuit structure is complicated and the cost is high
However, the amount of stored codes in a single ECU of a dual-fuel engine doubles, resulting in large memory consumption and reduced operating efficiency
Method used
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Embodiment Construction
[0023] The present invention will be further described below in conjunction with the accompanying drawings.
[0024] figure 2 It is a block diagram of a dual-fuel engine control system according to an embodiment of the present invention. The control system refits the gasoline engine control system. The content added on the basis of the gasoline engine control system includes a natural gas supply system, a sensor, and a natural gas / gasoline selection device (such as image 3 Shown), natural gas injection pulse width correction logic and ignition timing correction logic, etc., the natural gas supply system adopts the existing mature technology. The sensor signal includes the original gasoline engine sensor signal and the newly added sensor signal. The original gasoline engine sensor adopts the sensor installed on the original engine, (such as crankshaft position sensor, camshaft position sensor, cooling water temperature sensor, knock sensor, etc.) The newly added sensor includ...
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The invention discloses a control system for a natural gas / gasoline dual-fuel engine and belongs to the development field of electronic control of an engine. The control system is that a natural gas supply system, a natural gas control logic device, an air nozzle and a drive circuit thereof are additionally arranged on the basis of the control system of the original gasoline engine. The natural gas injection pulse width and the ignition timing in a single ECU (Electronic Control Unit) of the natural gas / gasoline dual-fuel engine are obtained through correcting the gasoline injection pulse width and the ignition timing under the same rotation speed and load conditions. An oil nozzle and the air nozzle share a high-power drive circuit and a power driver of the control system of the prior gasoline engine; and the switchover of the oil nozzle and the air nozzle is realized through controlling a relay in a natural gas / gasoline selection device with the ECU. The control system simplifies a logic driving circuit of the prior dual-fuel ECU, improves the driving efficiency, changes the control system of the prior gasoline engine as little as possible and has a simple circuit and low cost.
Description
technical field [0001] The invention belongs to the field of engine electronic control, and relates to a dual-fuel engine control system, in particular to a natural gas and gasoline dual-fuel engine control system. Background technique [0002] With the increasingly serious environmental and energy problems, natural gas has become one of the important fuels for engines. Retrofitting a gasoline engine into a natural gas / gasoline dual-fuel engine can make more efficient use of energy and alleviate the environmental crisis. The block diagram of the existing natural gas / gasoline dual-fuel engine control system is as follows: figure 1 As shown, the main control chip MCU of the ECU stores the control logic in the gasoline mode and the control logic in the natural gas mode; in terms of actuator drive, the fuel injector is driven by a high-power drive circuit and a power driver, and the air nozzle is driven by a High-power drive circuit and power driver drive. The added high-powe...
Claims
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Inventor 严臣树单玉梅郑慧高锋张强
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD