CN102352798B - Hydrogen fuel engine control method on basis of camshaft signal - Google Patents
Hydrogen fuel engine control method on basis of camshaft signal Download PDFInfo
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- CN102352798B CN102352798B CN 201110336376 CN201110336376A CN102352798B CN 102352798 B CN102352798 B CN 102352798B CN 201110336376 CN201110336376 CN 201110336376 CN 201110336376 A CN201110336376 A CN 201110336376A CN 102352798 B CN102352798 B CN 102352798B
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Abstract
The invention discloses a hydrogen fuel engine control method on the basis of a camshaft signal. A camshaft fluted disc adopted by the invention comprises two wide teeth and two narrow teeth, wherein the two width teeth are adjacent, and the two narrow teeth are adjacent; the angle of the camshaft corresponding to the sum of the width of each tooth and a tooth missing width is 90 degrees; according to the mechanical installation position of the camshaft fluted disc, the corresponding camshaft phase is determined when each cylinder is ignited and hydrogen is injected; the hydrogen fuel engine is controlled once when the camshaft fluted disc rotates 90 degrees each time; when the hydrogen fuel engine is controlled each time, the currently-captured tooth type is determined to be wide tooth or the narrow tooth by a camshaft signal; according to the tooth type captured by the time and the previous time, the phase of the current camshaft is determined; according to the current camshaft phase, a cylinder which needs to output a hydrogen injection and ignition control signal at present is determined; and a corresponding control signal is output to the cylinder. According to the hydrogen fuel engine control method, control accuracy can be improved, and abnormal burning phenomena of the tempering, the afterburning and the like of the engine because of phase judgment errors can be avoided.
Description
Technical field
The present invention relates to a kind of hydrogen fuel used for vehicle engine control based on camshaft signal, belong to the engine electronic control system field.
Background technique
The energy and environmental problem are two bottlenecks of restriction China Automobile Industry.Studies show that, automobile exhaust gas has become a main cause of pollution of atmosphere." U.S. is to the year two thousand thirty Prospect report of the economic transition of hydrogen " thought, petroleum resources may be in 25～30 years afterwards just with exhaustion.Optimistic estimation, after mid-term in century, petroleum resources also will face exhausted situation to 2l.
Hydrogen Energy is regarded as the most potential clean energy resource in this century as a kind of cleaning, efficient, safe, the continuable energy.Combustion of hydrogen afterproduct water does not have CO fully
2With various pollutants, it is the ideal fuels of motor.Adopt hydrogen as motor fuel can disposable solution automobile the energy, environmental pollution and carbon emission problem.
Existing hydrogen engine fuel system adopts mostly revises petrol engine or diesel fuel system realization, and for the new electronic control system of hydrogen engine exploitation.Electronic control system in petrol engine and diesel fuel system all adopts crankshaft signal to spray hydrogen after engine start stage and starting, igniting arranges.In the prior art, the detailed process of spraying hydrogen and igniting setting according to crankshaft signal is: high-low level difference corresponding teeth and the tooth of crankshaft signal lack, the crankshaft angles that each tooth is corresponding is 6 degree, count tooth according to crankshaft signal so, in the situation that the known current number of teeth and crank angle corresponding to per tooth, be easy to obtain crank phase, light a fire, spray the hydrogen setting according to crank phase.
But the physicochemical property of hydrogen and gasoline, diesel oil have very large difference, directly adopt the primary electron control system can not give full play to the advantage of hydrogen fuel.Especially in starting process, because combustion of hydrogen is very fast, so the first half stage of starting process be that the low-speed stage crankshaft signal changes greatly, the rear half stage of starting process is that the high speed stage crankshaft signal just tends towards stability.
When high rotating speed, because crankshaft signal changes not quite, when therefore carrying out several tooth according to crank phase, be not easy to occur mistake, and calculate according to crank phase, every variation 6 degree of crank angle calculate once, can improve control accuracy.But when the slow-speed of revolution, velocity variations is more violent, number tooth mistake easily occurs, thereby causes the phase place misjudgment.If current phase place misjudgment is easy to cause the malcombustion phenomenon such as tempering, after-burning of motor machine, affect the starting performance of motor, even the safety in operation of motor.
Therefore can consider the engine start process is divided into low speed and high speed stage, for example with 400 rev/mins of rotating shafts as separation, low-speed stage sprays the hydrogen igniting according to camshaft signal and arranges, high speed stage sprays the hydrogen igniting according to crankshaft signal and arranges.But the scheme that does not have at present to spray hydrogen igniting setting according to camshaft signal can be used for 4 cylinder hydrogen engines, thereby improves precise control.
Summary of the invention
In view of this, the present invention is directed to 4 cylinder hydrogen engines, a kind of hydrogen engine controlling method is provided, improve precise control, avoid the malcombustion phenomenons such as tempering, after-burning of the motor machine that the phase place misjudgment causes.The present invention program is applicable to engine speed and changes violent occasion.
The method for starting-controlling of hydrogen engine, its specific implementation process is as follows:
A kind of hydrogen-fuel engine controlling method based on camshaft signal comprises:
Design camshaft fluted disc comprises 2 wide teeth and 2 narrow teeth, and 2 wide teeth are adjacent, and 2 narrow teeth are adjacent, and it is 90 degree that the facewidth of each tooth and tooth lack camshaft angle corresponding to width sum; Adopt sensor to obtain camshaft signal, the high level corresponding teeth, the low level corresponding teeth lacks; In each cycle of camshaft signal, low level is front, and high level is rear; According to the installation mechanical location of camshaft fluted disc, corresponding camshaft phase when determining the igniting of each cylinder and during spray hydrogen;
Carry out engine control according to camshaft signal, concrete steps are: every rotation 90 degree of camshaft fluted disc are controlled once; During each control, utilize camshaft signal to determine that the current flute profile that captures is wide tooth or narrow tooth; Determine current camshaft phase according to this and last flute profile of catching, according to the cylinder of the current needs output of current camshaft phase judgement spray hydrogen, ignition control signal, and to this cylinder output corresponding control signal.
If---order of the narrow tooth of wide tooth---wide tooth---is carried out mark according to narrow tooth with the tooth on camshaft, when camshaft was installed, the trailing edge of each tooth signal of the camshaft in described order is the compression top center of corresponding motor 1 cylinder, 3 cylinders, 4 cylinders, 2 cylinders successively; Spray hydrogen, fire signal in compression top center output respective cylinder;
Describedly determine current camshaft phase according to this and last flute profile of catching, according to the cylinder of the current needs output of current camshaft phase judgement spray hydrogen, ignition control signal, and this cylinder is carried out the step that corresponding spray hydrogen and igniting arrange be specially:
If what this was caught is the wide tooth that is of catching wide tooth and last time, export 4 cylinder ignition control signals, output 1 cylinder spray hydrogen control signal;
If what this was caught is the narrow tooth that is of catching wide tooth and last time, export 3 cylinder ignition control signals, output 2 cylinders spray hydrogen control signals;
Last time is captured as wide tooth if this is captured as narrow tooth, exports 2 cylinder ignition control signals, output 3 cylinder spray hydrogen control signals;
If this is captured as narrow tooth and the last time is captured as narrow tooth; Export 1 cylinder ignition control signal, output 4 cylinder spray hydrogen control signals.
Preferably, wide tooth tooth lacks corresponding angle less than 45 degree, and narrow tooth tooth lacks corresponding angle greater than 45 degree;
The described camshaft signal that utilizes determines that the current flute profile that captures is that wide tooth or the step of narrow tooth are specially: 1) when the camshaft signal level changes, catch current demand signal, detecting simultaneously the current potential of current demand signal, is low level if work as the prepotential, is trailing edge; If when the prepotential is high level, be rising edge; The cycle of a whole tooth is from trailing edge;
2) time difference according to trailing edge and rising edge calculates the low level time, calculates the time of high level according to time difference of rising edge and trailing edge;
3) utilizing the width of high level and the width meter in camshaft signal cycle to calculate dutycycle, if dutycycle greater than 50%, is wide tooth, otherwise is narrow tooth.
Method and system of the present invention compared with prior art have the following advantages:
Utilize the camshaft fluted disc form of two wide teeth+two narrow teeth, the present invention utilizes the detection of flute profile to determine camshaft phase, according to the relation between camshaft phase and 4 cylinders of motor, motor is sprayed the hydrogen IGNITION CONTROL.The present invention can be applied in the violent occasion of velocity variations, and for example the low-speed stage of engine start, because the phase place that does not adopt the number tooth is determined scheme, even if change acutely, still can determine comparatively accurately current flute profile, thereby accurately spray the hydrogen IGNITION CONTROL.
Description of drawings
Fig. 1 is that the present invention utilizes camshaft signal to spray the flow chart of hydrogen, fire signal control;
Fig. 2 is the engine control signal production process of the present invention when determining corresponding motor 1 cylinder of narrow tooth-wide tooth-wide tooth-narrow tooth, 3 cylinders, 4 cylinder 2 cylinder spray hydrogen.
Embodiment
Below in conjunction with the accompanying drawing embodiment that develops simultaneously, describe the present invention.
The invention provides a kind of controlling method of 4 cylinder hydrogen engines, being applied to be applicable to engine speed changes violent and rotating speed is not the occasion of very fast (lower than 400 rev/mins), its basic thought is: determine camshaft phase according to the variation of camshaft flute profile, according to the corresponding relation of camshaft phase and cylinder spray hydrogen, igniting arranges.
Fig. 1 is that the present invention utilizes camshaft signal to spray the flow chart of hydrogen, fire signal control.As shown in Figure 1, the method comprises the following steps:
Step 1: the related camshaft of controlling method of the present invention is a kind of camshaft of 4 teeth.The camshaft fluted disc comprises 2 wide teeth and 2 narrow teeth, is wide tooth or narrow tooth for the ease of judging according to camshaft signal when nipper, sets wide tooth and be the facewidth greater than half tooth of total cycle of tooth, and narrow tooth is the facewidth less than half tooth of total cycle of tooth.2 wide teeth are adjacent, and 2 narrow teeth are adjacent, form wide-wide-narrow-narrow form, and it is 90 degree that the facewidth of each tooth and tooth lack the width sum.
Step 2: this camshaft fluted disc is in place, according to the installation mechanical location of camshaft fluted disc, corresponding camshaft phase when determining the igniting of each cylinder and during spray hydrogen.
For 4 cylinder hydrogen engines, the ignition order of 4 cylinders is 1 cylinder, 3 cylinders, 4 cylinders, 2 cylinders, and the spray hydrogen of 4 cylinders is sequentially 4 cylinders, 2 cylinders, 1 cylinder, 3 cylinders.---order of the narrow tooth of wide tooth---wide tooth---is carried out mark to the present embodiment according to narrow tooth with the tooth on camshaft, when camshaft was installed, the trailing edge of each tooth signal of the camshaft in described order is the compression top center of corresponding motor 1 cylinder, 3 cylinders, 4 cylinders, 2 cylinders successively.Spray hydrogen, fire signal in compression top center output respective cylinder.
Step 3: at camshaft fluted disc place sensor installation, adopt sensor to obtain camshaft signal, the high level corresponding teeth, the low level corresponding teeth lacks.
Step 4: every rotation 90 degree of camshaft fluted disc are controlled once; During each control, utilize camshaft signal to determine that the current flute profile that captures is wide tooth or narrow tooth; Determine current camshaft phase according to this and last flute profile of catching, according to the cylinder of the current needs output of current camshaft phase judgement spray hydrogen, ignition control signal, and to this cylinder output corresponding control signal.
In the situation that step 2 has been set narrow tooth---corresponding 1 cylinder of the narrow tooth of wide tooth---wide tooth---, 3 cylinders, 4 cylinders, 2 cylinder igniting, as shown in Figure 2, this step 4 is specially:
1) when the camshaft signal level changes, catching current demand signal, detect simultaneously the current potential of current demand signal, is low level if work as the prepotential, is trailing edge; If when the prepotential is high level, be rising edge.
2) time difference according to trailing edge and rising edge calculates the low level time, calculate the time of high level according to time difference of rising edge and trailing edge, because in the present embodiment, therefore one-period calculates the cycle according to the time difference between trailing edge and trailing edge from trailing edge.
3) utilizing the width of high level and the width meter in camshaft signal cycle to calculate dutycycle, if dutycycle greater than 50%, is wide tooth, otherwise is narrow tooth.
4) judge the cylinder of current needs output spray hydrogen, ignition control signal according to this and last flute profile of catching, and this cylinder carried out corresponding spray hydrogen and igniting setting, specifically be divided into following 4 kinds of situations:
If this catch for wide tooth and caught last time for wide tooth, export 4 cylinder ignition control signals, output 1 cylinder spray hydrogen control signal;
If this catch for wide tooth and caught last time for narrow tooth, export 3 cylinder ignition control signals, output 2 cylinders spray hydrogen control signals;
If this is captured as narrow tooth and was captured as wide tooth last time, export 2 cylinder ignition control signals, output 3 cylinder spray hydrogen control signals;
If this is captured as narrow tooth and was captured as narrow tooth last time; Export 1 cylinder ignition control signal, output 4 cylinder spray hydrogen control signals.
As seen, the present invention adopts the flute profile of camshaft to determine camshaft phase, sprays hydrogen, igniting setting according to camshaft phase, and the various defectives of avoiding several teeth to bring have improved precise control effectively.Although spray the control accuracy of hydrogen igniting not as the control program according to crank phase according to camshaft, but can guarantee that correctness is the fundamental prerequisite of engine health work, and the control according to camshaft phase also can be satisfied the requirement of control accuracy in the low speed situation.
The present invention can effectively be applied in the starting process of hydrogen engine according to the scheme that camshaft signal carries out hydrogen engine control.As stated in the Background Art, with 400 rev/mins of speeds of crankshaft as separation, the low-speed stage velocity variations of hydrogen engine is more violent, number tooth mistake easily appears if adopt bent axle to control, thereby cause the phase place misjudgment, therefore can adopt the present invention according to the control program of camshaft signal, after 400 rev/mins of rotating speed high pressure, can adopt the control program of crankshaft signal.
In sum, these are only preferred embodiment of the present invention, is not for limiting protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (2)
1. the hydrogen-fuel engine controlling method based on camshaft signal, is characterized in that, comprising:
Design camshaft fluted disc comprises 2 wide teeth and 2 narrow teeth, and 2 wide teeth are adjacent, and 2 narrow teeth are adjacent, and it is 90 degree that the facewidth of each tooth and tooth lack camshaft angle corresponding to width sum;---order of the narrow tooth of wide tooth---wide tooth---is carried out mark, and when camshaft was installed, the trailing edge of each tooth signal of the camshaft in described order is the compression top center of corresponding motor 1 cylinder, 3 cylinders, 4 cylinders, 2 cylinders successively according to narrow tooth with the tooth on camshaft; Spray hydrogen, fire signal in compression top center output respective cylinder;
Adopt sensor to obtain camshaft signal, the high level corresponding teeth, the low level corresponding teeth lacks; In each cycle of camshaft signal, low level is front, and high level is rear; According to the installation mechanical location of camshaft fluted disc, corresponding camshaft phase when determining the igniting of each cylinder and during spray hydrogen;
Carry out engine control according to camshaft signal, concrete steps are: every rotation 90 degree of camshaft fluted disc are controlled once; During each control, utilize camshaft signal to determine that the current flute profile that captures is wide tooth or narrow tooth;
If what this was caught is the wide tooth that is of catching wide tooth and last time, export 4 cylinder ignition control signals, output 1 cylinder spray hydrogen control signal;
If what this was caught is the narrow tooth that is of catching wide tooth and last time, export 3 cylinder ignition control signals, output 2 cylinders spray hydrogen control signals;
Last time is captured as wide tooth if this is captured as narrow tooth, exports 2 cylinder ignition control signals, output 3 cylinder spray hydrogen control signals;
If this is captured as narrow tooth and the last time is captured as narrow tooth; Export 1 cylinder ignition control signal, output 4 cylinder spray hydrogen control signals.
2. the method for claim 1, is characterized in that, wide tooth tooth lacks corresponding angle less than 45 degree, and narrow tooth tooth lacks corresponding angle greater than 45 degree;
The described camshaft signal that utilizes determines that the current flute profile that captures is that wide tooth or the step of narrow tooth are specially: 1) when the camshaft signal level changes, catch current demand signal, detecting simultaneously the current potential of current demand signal, is low level if work as the prepotential, is trailing edge; If when the prepotential is high level, be rising edge; The cycle of a whole tooth is from trailing edge;
2) time difference according to trailing edge and rising edge calculates the low level time, calculates the time of high level according to time difference of rising edge and trailing edge;
3) utilizing the width of high level and the width meter in camshaft signal cycle to calculate dutycycle, if dutycycle greater than 50%, is wide tooth, otherwise is narrow tooth.
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| CN105909396A (en) * | 2016-06-23 | 2016-08-31 | 襄阳美标朗源动力实业有限公司 | Energy-saving gas engine |
| CN109057955A (en) * | 2018-07-28 | 2018-12-21 | 襄阳美标朗源动力实业有限公司 | Non- automobile-used methane power generating system |
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| JP3768927B2 (en) * | 2002-07-10 | 2006-04-19 | 三菱電機株式会社 | Cylinder discrimination device for internal combustion engine |
| JP4192844B2 (en) * | 2004-05-21 | 2008-12-10 | 株式会社デンソー | Rotational position detection device for internal combustion engine |
| FR2876738B1 (en) * | 2004-10-20 | 2009-09-25 | Siemens Vdo Automotive Sas | METHOD FOR DETERMINING THE PHASING OF AN INTERNAL COMBUSTION ENGINE |
| CN200985857Y (en) * | 2006-12-15 | 2007-12-05 | 浙江吉利汽车研究院有限公司 | Direct-reading signal disc |
| DE102006061572A1 (en) * | 2006-12-27 | 2008-07-03 | Robert Bosch Gmbh | Sensor's output signal coding method, involves determining rotation direction of shaft and partition ratio of tooth, and coding rotating direction and partition ratio as pulse width coded output signal |
| CN101210522B (en) * | 2006-12-31 | 2010-08-25 | 比亚迪股份有限公司 | Signal disc and engine cylinder sequence distinguishing device and method containing the same |
| CN102116809B (en) * | 2009-12-30 | 2014-08-13 | 中国第一汽车集团公司 | Method for diagnosing phase sensor |
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Effective date of registration: 20221103 Address after: Room 302, Building 10, No. 26, Liushui Road, East Yanshan, Fangshan District, Beijing 102502 Patentee after: Beijing Hydrogen Fuel Technology Co.,Ltd. Address before: 100081 No. 5 South Main Street, Haidian District, Beijing, Zhongguancun Patentee before: BEIJING INSTITUTE OF TECHNOLOGY |
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