CN102251856B - Synchronous automatic measurement device and method for air-fuel ratio of compressed natural gas engine - Google Patents
Synchronous automatic measurement device and method for air-fuel ratio of compressed natural gas engine Download PDFInfo
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- CN102251856B CN102251856B CN 201110117470 CN201110117470A CN102251856B CN 102251856 B CN102251856 B CN 102251856B CN 201110117470 CN201110117470 CN 201110117470 CN 201110117470 A CN201110117470 A CN 201110117470A CN 102251856 B CN102251856 B CN 102251856B
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Abstract
The invention discloses a synchronous automatic measurement device and a synchronous automatic measurement method for an air-fuel ratio of a compressed natural gas engine. An air flow meter, an air throttle position sensor, an air inlet pressure sensor and an air inlet temperature sensor are sequentially arranged on an air inlet pipe; two ends of an inlet valve displacement sensor are connected with an inlet valve and a cylinder cover respectively, and two ends of an exhaust valve displacement sensor are connected with an exhaust valve and the cylinder cover respectively; a three-way catalytic converter and a wideband oxygen sensor are arranged on an exhaust pipe; a revolution speed sensor is arranged at the shaft end of a crank-link mechanism; and an electric control unit is connected with the air flow meter, the air throttle position sensor, the air inlet pressure sensor, the air inlet temperature sensor, the inlet valve displacement sensor, the exhaust valve displacement sensor, the revolution speed sensor, the wideband oxygen sensor, a spark plug and an injector respectively. According to the device and the method, opening signals of the inlet valve and the exhaust valve of the engine are used as triggering signals for synchronous data acquisition, and synchronous automatic measurement of the air-fuel ratio of the compressed natural gas engine is realized.
Description
Technical field
The present invention relates to a kind of compressed natural gas engine air-fuel ratio synchronous measuring apparatus and method thereof.The air fuel ratio that is applicable to various compressed natural gas used as vehicle fuel motors is measured.
Background technique
Compressed natural gas (Compressed Natural Gas---be called for short CNG) have good and economic and lower discharging pollutants as automotive fuel.At present the CNG automobile generally adopts the three-element catalytic transformation technology, according to the performance characteristic of three-way catalytic converter, when the air fuel ratio of CNG engine mixed gas near theoretical air fuel ratio 17, just can make HC, CO and NO
XIt is the highest that the purification ratio of three kinds of harmful gases all reaches.When motor was in steady working condition, automatical control system adopted the lambda sensor closed loop control simultaneously through detecting air inflow, can air fuel ratio accurately be controlled near the chemically correct fuel.Yet when motor is in transient working condition (acceleration, deceleration process); Fill the exhaust phenomenon dynamically because closure sudden change, gas handling system exist, the air fuel ratio and the actual mixing ratio that cause sensor to arrive are unequal; The hysteresis quality of lambda sensor response in addition; Air fuel ratio can't be accurately controlled in closed loop control commonly used, the requirement that self-adaptation control method can not satisfy this operating mode, therefore at present under transient working condition air fuel ratio generally adopt open loop control.Yet owing to receive the influence of road conditions, especially as the CNG automobile of bus or taxi, the most of the time all is in transient working condition when going in the urban district.Effectively the air fuel ratio of control CNG motor when transient working condition seems very main.
When the CNG motor is in transient working condition; The signal of sensors such as a certain moment throttle position, rotating speed, suction pressure, charge flow rate output; The operating parameters of just representing this moment motor; Next these operating parameters of the moment will change, and therefore have bigger error certainly by detecting charge flow rate control air fuel ratio; Utilize the oxygen sensor signal feedback control air fuel ratio can not requirement of real time when the motor transient working condition in addition, because the signal indication of the lambda sensor concentration of combustion mixture, and the air fuel ratio of next work cycle changes.
Summary of the invention
The objective of the invention is to overcome the deficiency of existing technology, a kind of compressed natural gas engine air-fuel ratio synchronous measuring apparatus and method thereof are provided.
The synchronous automatic measuring device of compressed natural gas engine air-fuel ratio comprises engine intake valve, spark plug, cylinder head, exhaust valve, outlet pipe, cylinder body, piston, connecting rod, gas supply system, sparger and suction tude; Cylinder head is installed on the cylinder body; Piston is installed in the cylinder body, and piston is connected with connecting rod; Be separately installed with outlet pipe, suction tude and spark plug on the cylinder head; Intake valve is installed on the suction tude, and exhaust valve is installed on row's suction tude; Sparger is installed on the suction tude, and gas supply system is connected with sparger; Also comprise Air flow meter, TPS, air inlet pressure sensor, intake air temperature sensor, intake valve displacement transducer, exhaust valve displacement transducer, ternary catalyzing unit, broad domain oxygen sensor, speed probe, ECU; Air flow meter, TPS, air inlet pressure sensor and intake air temperature sensor are installed on the suction tude successively; One end of intake valve displacement transducer links to each other with intake valve, the other end of intake valve displacement transducer links to each other with cylinder head; One end of exhaust valve displacement transducer links to each other with exhaust valve, the other end of exhaust valve displacement transducer links to each other with cylinder head; Ternary catalyzing unit and broad domain oxygen sensor are installed on the outlet pipe; Speed probe is installed in the axle head of connecting rod; ECU is connected with sparger with Air flow meter, TPS, air inlet pressure sensor, intake air temperature sensor, intake valve displacement transducer, spark plug, exhaust valve displacement transducer, broad domain oxygen sensor, speed probe respectively.
Compressed natural gas engine air-fuel ratio method for synchronously measuring is: the signal that is received the engine throttle position sensing device by ECU; And calculating throttle position variance ratio; When ECU monitors the throttle position variance ratio greater than preset value; Commencing signal is gathered preparatory work and is detected the signal of intake valve displacement transducer; Wait for the IO Intake Valve Opens signal, when the IO Intake Valve Opens signal occurred, ECU sent the signal that Air flow meter, TPS, air inlet pressure sensor, intake air temperature sensor and engine rotation speed sensor are gathered in instruction simultaneously; ECU carries out these signals to read after the A/D conversion, and deposits in the data file; Meanwhile, ECU detects the signal of exhaust valve displacement transducer, and when exhauxt valve opens, ECU starts broad domain oxygen sensor, and gathers the air fuel ratio signal of broad domain oxygen sensor, this signal is carried out reading after the A/D conversion, and deposit in the data file.When throttle position variance ratio during less than preset value, ECU is ended data capture.
The present invention surveys the gas that gets into and discharge cylinder like this and is the gas in the same work cycle with the signal of engine intake valve and the exhauxt valve opens trigger signal as the ECU image data, has realized measuring automatically synchronously of CNG engine air-fuel ratio.
Description of drawings
Fig. 1 is the synchronous automatic measuring device structural representation of compressed natural gas engine air-fuel ratio;
Fig. 2 is the synchronous method for automatic measurement FB(flow block) of compressed natural gas engine air-fuel ratio.
Embodiment
As shown in Figure 1, the synchronous automatic measuring device of compressed natural gas engine air-fuel ratio comprises engine intake valve 6, spark plug 7, cylinder head 8, exhaust valve 9, outlet pipe 11, cylinder body 14, piston 15, connecting rod 16, gas supply system 18, sparger 19 and suction tude 20; Cylinder head 8 is installed on the cylinder body 14; Piston 15 is installed in the cylinder body 14, and piston 15 is connected with connecting rod 16; Be separately installed with outlet pipe 11, suction tude 20 and spark plug 7 on the cylinder head 8; Intake valve 6 is installed on the suction tude 20, on exhaust valve 9 row's of being installed in suction tude 11; Sparger 19 is installed on the suction tude 20, and gas supply system 18 is connected with sparger 19; Also comprise Air flow meter 1, TPS 2, air inlet pressure sensor 3, intake air temperature sensor 4, intake valve displacement transducer 5, exhaust valve displacement transducer 10, ternary catalyzing unit 12, broad domain oxygen sensor 13, speed probe 17, ECU 21; Air flow meter 1, TPS 2, air inlet pressure sensor 3 and intake air temperature sensor 4 are installed on the suction tude 20 successively; One end of intake valve displacement transducer 5 links to each other with intake valve 6, the other end of intake valve displacement transducer 5 links to each other with cylinder head 8; One end of exhaust valve displacement transducer 10 links to each other with exhaust valve 9, the other end of exhaust valve displacement transducer 10 links to each other with cylinder head 8; Ternary catalyzing unit 12 is installed on the outlet pipe 11 with broad domain oxygen sensor 13; Speed probe 17 is installed in the axle head of connecting rod 16; ECU 21 is connected with Air flow meter 1, TPS 2, air inlet pressure sensor 3, intake air temperature sensor 4, intake valve displacement transducer 5, spark plug 7, exhaust valve displacement transducer 10, broad domain oxygen sensor 13, speed probe 17 and sparger 19 respectively.
The purpose that on intake valve 6 and exhaust valve 9, is installed into valve displacement transducer 5 and exhaust valve displacement transducer 10 is to detect the action of intake valve 6 and exhaust valve 9; The signal of intake valve and exhauxt valve opens is provided; Starting point as ECU 21 data captures; Survey the gas that gets into and discharge certain cylinder like this and be the gas in the same work cycle; The air inlet data that promptly collect are for getting into the information of the air of this cylinder in intake process, the exhaust data that collect are these air are discharged the gas of this cylinder after compression, burning information, realized the synchro measure of air fuel ratio.
As shown in Figure 2; Compressed natural gas engine air-fuel ratio method for synchronously measuring is: the closure of setting in test the CNG motor changes with different rates; Receive the signal of TPS 2 and calculate the throttle position variance ratio by ECU 21; When throttle position variance ratio during greater than preset value, motor is in transient working condition, and ECU 21 commencing signals are gathered preparatory work and detected the signal of intake valve displacement transducer 5; Wait for the IO Intake Valve Opens signal; When the IO Intake Valve Opens signal occurred, ECU 21 sent the signal that Air flow meter 1, TPS 2, air inlet pressure sensor 3, intake air temperature sensor 4 and engine rotation speed sensor 17 are gathered in instruction simultaneously, and ECU 21 carries out these signals to read in and deposit in the data file after the A/D conversion; Meanwhile, ECU 21 detects the signal of exhaust valve displacement transducer 10, and when exhauxt valve opens, ECU 21 starts broad domain oxygen sensor 13, and gathers the air fuel ratio signal of broad domain oxygen sensor 13, deposits in the data file.When throttle position variance ratio during less than the preset value set, motor is in steady working condition, and ECU 21 is ended data captures.
CNG engine air-fuel ratio synchro measure principle is:
As shown in Figure 1, the air inlet of CNG motor and gas supply system mainly comprise suction tude 20 and gas supply system 18 two-part.Air fuel ratio R is that every circulation sucks the air quality Mac of cylinder and the ratio of the combustion gas quality Mfc that sprays into cylinder, i.e. R=Mac/Mfc.The combustion gas quality Mfc that every circulation sprays into cylinder can accurately be controlled by ECU 21, and the key that realizes the air fuel ratio synchro measure is to accurately measure the air quality Mac that every circulation sucks cylinder.
According to engine intake airflow mean value model, the air quality Mat of the closure of flowing through is the nonlinear function of throttle opening α and suction pressure Pm, that is:
The air quality Mac that gets into cylinder can be described as the nonlinear function of engine speed n and suction pressure Pm, so:
When motor is in transient working condition, because existing, gas handling system fills the exhaust phenomenon dynamically, no longer equal into and out of the air mass flow of suction tude.Have according to ideal-gas equation:
Mam=
(3)
In the formula: Mam is an air quality in the suction tude; Vm is the suction tude volume; R is a gas constant; Tm is an intake temperature.
Formula (3) both sides obtain simultaneously to the time differentiate:
Consider that transmission of heat is very little in the suction tude, pressure is far longer than temperature over time over time, so ignore second on formula (4) the right.Air intake duct system is regarded as a gas-filled pump,, has suction tude air stream application quality conservation law:
Get by formula (4) and formula (5):
Can know that by formula (1), formula (2) and formula (6) during transient working condition, the air quality that gets into cylinder through suction tude can be described as:
（7）
Visible by formula (7), the air quality Mac that every circulation gets into cylinder and engine speed n, suction pressure Pm are relevant with throttle opening α.And suction pressure receives the influence of factors such as environment atmospheric pressure, adiabatic coefficient, charging efficiency, engine speed and throttle opening, so the expressed function of formula (7) is a compound function.From the intake process analysis, under transient working condition, the variation of suction pressure mainly receives the influence of engine speed and throttle opening.Corresponding sensor is installed on suction tude,, can be calculated the air quality that gets into cylinder through measuring parameters such as engine speed, suction pressure, intake temperature and throttle opening.
Claims (1)
1. compressed natural gas engine air-fuel ratio method for synchronously measuring; It is characterized in that: the signal that receives TPS (2) by the ECU (21) of the synchronous automatic measuring device of compressed natural gas engine air-fuel ratio; And calculating throttle position variance ratio; When ECU (21) monitors the throttle position variance ratio greater than preset value; Commencing signal is gathered preparatory work and is detected the signal of intake valve displacement transducer (5); Wait for the signal that intake valve (6) is opened, when intake valve (6) when start signal occurs, ECU (21) sends the signal that Air flow meter (1), TPS (2), air inlet pressure sensor (3), intake air temperature sensor (4) and engine rotation speed sensor (17) are gathered in instruction simultaneously; ECU (21) carries out these signals to read after the A/D conversion, and deposits in the data file; Meanwhile; ECU (21) detects the signal of exhaust valve displacement transducer (10); When exhauxt valve opens, ECU (21) starts broad domain oxygen sensor (13), and gathers the air fuel ratio signal of broad domain oxygen sensor (13); The air fuel ratio signal of the broad domain oxygen sensor of gathering (13) is carried out reading after the A/D conversion, and deposit in the data file; When throttle position variance ratio during less than preset value, ECU (21) is ended data capture;
The synchronous automatic measuring device of described compressed natural gas engine air-fuel ratio comprises engine intake valve (6), spark plug (7), cylinder head (8), exhaust valve (9), outlet pipe (11), cylinder body (14), piston (15), connecting rod (16), gas supply system (18), sparger (19) and suction tude (20); Cylinder head (8) is installed on the cylinder body (14); Piston (15) is installed in the cylinder body (14), and piston (15) is connected with connecting rod (16); Be separately installed with outlet pipe (11), suction tude (20) and spark plug (7) on the cylinder head (8); Intake valve (6) is installed on the suction tude (20), and exhaust valve (9) is installed on the outlet pipe (11); Sparger (19) is installed on the suction tude (20), and gas supply system (18) is connected with sparger (19); It is characterized in that comprising Air flow meter (1), TPS (2), air inlet pressure sensor (3), intake air temperature sensor (4), intake valve displacement transducer (5), exhaust valve displacement transducer (10), ternary catalyzing unit (12), broad domain oxygen sensor (13), speed probe (17), ECU (21); Air flow meter (1), TPS (2), air inlet pressure sensor (3) and intake air temperature sensor (4) are installed on the suction tude (20) successively; One end of intake valve displacement transducer (5) links to each other with intake valve (6), the other end of intake valve displacement transducer (5) links to each other with cylinder head (8); One end of exhaust valve displacement transducer (10) links to each other with exhaust valve (9), the other end of exhaust valve displacement transducer (10) links to each other with cylinder head (8); Ternary catalyzing unit (12) and broad domain oxygen sensor (13) are installed on the outlet pipe (11); Speed probe (17) is installed in the axle head of connecting rod (16); ECU (21) is connected with Air flow meter (1), TPS (2), air inlet pressure sensor (3), intake air temperature sensor (4), intake valve displacement transducer (5), spark plug (7), exhaust valve displacement transducer (10), broad domain oxygen sensor (13), speed probe (17) and sparger (19) respectively.
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| CN104500250A (en) * | 2014-12-23 | 2015-04-08 | 苟仲武 | Four-stroke engine modification device and operating method |
| CN106226087A (en) * | 2016-10-08 | 2016-12-14 | 潍柴西港新能源动力有限公司 | A kind of electromotor each cylinder direct measurement apparatus of air inlet distributing uniformity and method |
| CN106770978B (en) * | 2017-01-20 | 2019-04-02 | 中国第一汽车股份有限公司 | A kind of natural gas engine divides cylinder mixture strength measuring system and measurement method |
| CN110410226B (en) * | 2019-07-29 | 2024-07-16 | 潍柴西港新能源动力有限公司 | Power balance control system and control method for two sides of V-shaped gas engine |
| CN110632430B (en) * | 2019-10-17 | 2024-08-09 | 潍柴西港新能源动力有限公司 | Test system and test method for simulating backfire resistance of throttle valve |
| CN114251994A (en) * | 2021-12-24 | 2022-03-29 | 宁波艾思科汽车音响通讯有限公司 | Automatic test device for depth of contact pin of automobile wire harness terminal |
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| CN1167870C (en) * | 1999-07-30 | 2004-09-22 | 边永安 | Variable compression ratio and variable air distributing phase |
| KR100598532B1 (en) * | 2004-12-20 | 2006-07-10 | 현대자동차주식회사 | Linear EMV actuator using permanent magnet and electro magnet |
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| CN202055919U (en) * | 2011-05-09 | 2011-11-30 | 浙江科技学院 | Automatic synchronous measurement device for air-fuel ratio of compressed natural gas engine |
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