CN103573454A - Electronic control method for engine with oil supply system using carburetor - Google Patents
Electronic control method for engine with oil supply system using carburetor Download PDFInfo
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Abstract
The invention discloses an electronic control method for an engine with an oil supply system using a carburetor. The method includes the following steps that an electronic control unit (ECU) receives collected throttle percentage and engine speed signals; the ECU inquires a first three-dimensional management picture pre-stored in the ECU according to the throttle percentage and the engine speed to determine an ignition advance angle, independent variable of the first three-dimensional management picture is the throttle percentage and the engine speed, and dependent variable is the ignition advance angle; the ECU controls the ignition moment of an ignition coil according to the inquired ignition advance angle. An electronic fuel injection control principle is shifted on the engine using the carburetor, precise control can be conducted on air-fuel ratio and the engine ignition moment, and discharging and output are improved.
Description
Technical field
The present invention relates to the electric-control method of the oil-fired system of small displacement engine, be specifically related to the electric-control method that oil supply system adopts the motor of Carburetor.
Background technique
The oil supply system of the motor of the motorcycle of prior art is generally divided into two kinds: carburetor oil-supply system and electronic fuel injection system.
Carburetor oil-supply system mainly comprises common Carburetor and ternary catalyzing unit, relatively simple in structure, and coupling easily, cost is lower, but the air fuel ratio control accuracy of air-fuel mixture is not high, and scattered error is larger, be difficult to make ternary catalyzing unit performance optimal conversion efficiency, be also difficult to control the discharge amount discharging pollutants.Along with improving constantly of emission standard, the technology path that adds ternary catalyzing unit with common Carburetor is realized emission compliance, seems more and more difficult.
Electronic fuel injection system is called for short EFI, it is that petrol engine is cancelled Carburetor and a kind of more advanced fueling injection equipment that adopts, by receiving some sensor signals, control time of ignition and fuel injection quantity, the air fuel ratio of can Precise Control of Oil gas mixing, make ternary catalyzing unit in best purification state, effectively control the discharge amount discharging pollutants, and can improve motor and vehicle performance.Yet electronic fuel injection system huge structure, complexity, complete vehicle structure is changed larger, and coordinate a series of sensor, exploitation need to drop into a lot of designs, manufacture cost in early days, and development late stage also will drop into more manpower and materials and carry out after sales service personnel's training and purchasing of relevant device, be applied on the automobile that price is more expensive, client is also more acceptant, if but be applied on motorcycle, cause motorcycle expensive, client is difficult to accept, and is difficult to be popularized.In addition, electronic fuel injection system has a very large shortcoming: due to final controlling element control is that gasoline sprays, therefore when sensor breaks down, can be to ECU(electronic control unit) signal of mistake, final controlling element also can be received wrong instruction, the bad present situations such as " sending out punching " that causes that car load fuel consume is excessive or car load is unable.When final controlling element and ECU break down, cannot normally travel.In addition, when battery tension is too low, this system can not work, and motorcycle can not normally be ridden.These factors are all restricting the popularization of electronic fuel injection system.
Summary of the invention
In view of the foregoing defects the prior art has, the problem to be solved in the present invention is, carburetor oil-supply system is not high and electronic fuel injection system complex structure to air-fuel mixture air fuel ratio control accuracy, the problem that the high and final controlling element of cost cannot travel while having fault.
For addressing the above problem, the present invention adopts following scheme: oil supply system adopts the electric-control method of the motor of Carburetor, comprises the steps:
The throttle opening that ECU receiving sensor collects and the signal of engine speed; Described ECU the first three-dimensional control chart that inquiry is pre-stored in described ECU according to throttle opening and engine speed is determined ignition advance angle, and the independent variable of described the first three-dimensional control chart is throttle opening and engine speed, and dependent variable is ignition advance angle; Described ECU is according to the time of ignition of inquired ignition advance angle control spark coil.
As preferably, also comprise the steps:
Described ECU is according to the operating mode of throttle opening and engine speed judgement motor, and the dutycycle of the tonifying Qi solenoid valve of controlling according to the definite employing of the be pre-stored in described ECU second three-dimensional control chart pulse width modulation mode; Described tonifying Qi solenoid valve is arranged on described Carburetor place, for the idling air flue to described Carburetor, carries out tonifying Qi to regulate the air fuel ratio of mixed gas; The independent variable of described the second three-dimensional control chart is throttle opening and engine speed, and dependent variable is the pulse width modulation duty of tonifying Qi solenoid valve.
As preferably, also comprise the steps:
The signal that the temperature transducer that the cylinder cylinder top that described ECU reception is arranged on motor is located collects is to determine temperature cylinder; Described ECU compensates and corrects time of ignition according to temperature cylinder: when temperature cylinder is during less than or equal to 0 ℃, increase ignition advance angle; When temperature cylinder is during higher than 40 ℃, reduce ignition advance angle.
As preferably, also further comprise the steps: that described ECU compensates and corrects the dutycycle of tonifying Qi solenoid valve according to temperature cylinder: when temperature cylinder is during less than or equal to 20 ℃, reduce the air compensation of tonifying Qi solenoid valve.
As preferably, also comprise the steps: that described ECU detects O in waste gas according to the lambda sensor that is installed on the exhaust ports of motor
2concentration signal the dutycycle of described tonifying Qi solenoid valve is controlled.
As preferably, described ECU is according to the O in waste gas
2concentration determine the air fuel ratio of current gas mixture, when gas mixture is dense state, described ECU increases air compensation and makes the O in waste gas by changing the dutycycle of described tonifying Qi solenoid valve
2to rare state adjustment; When gas mixture is rare state, described ECU reduces air compensation and makes the O in waste gas by changing the pulse width modulation duty of described tonifying Qi solenoid valve
2to dense state adjustment.
As preferred version, described ECU by adjust dutycycle change air compensation take the detailed process that changes air fuel ratio as: when gas mixture is during as dense state, first with the form jump type of the first step function increase dutycycle with, and then increase gradually dutycycle with the form of the first linear function, until gas mixture is rare state; When gas mixture is rare state, first the form jump type with the second step function reduces dutycycle, and then reduces gradually dutycycle with the second linear function, until described gas mixture is dense state.
As one of preferred further, described the first step function equates with the step value of the second step function, and the absolute value of the slope of the first linear function and the second linear function also equates.
As one of preferred further, the absolute value of the slope of the step value of described the first step function and the second step function unequal and/or the first linear function and the second linear function is also unequal.
Further, the step value of described the first step function is more than or equal to 5% of former dutycycle, and the step value of described the second step function is also more than or equal to 5% of former dutycycle.
Oil supply system of the present invention adopts the electric-control method of the motor of Carburetor, there is following beneficial effect: by the Electronic Fuel Injection (EFI) control principle value of moving to the motor adopting on Carburetor, can precisely control air fuel ratio, engine igniting time, thereby the motorcycle emission that makes to adopt this motor purifies to adapt to the emission standard of increasingly stringent more, also make the power stage of motor more optimize, promoted the driving performance of car load.
Accompanying drawing explanation
Fig. 1 is the composition structural representation of the automatical control system of the oil supply system motor that adopts Carburetor;
Fig. 2 is the IGNITION CONTROL loop sketch of the control system shown in Fig. 1;
Fig. 3 is the control loop sketch of the tonifying Qi solenoid valve of the control system shown in Fig. 1;
Fig. 4 is the structure diagram that the temperature cylinder sensor of the control system shown in Fig. 1 is connected with ECU;
Fig. 5 is the structure diagram that the lambda sensor of the control system shown in Fig. 1 is connected with ECU;
Fig. 6 is the schematic diagram that oil supply system of the present invention adopts the first three-dimensional control chart that an embodiment of the motor of Carburetor adopts;
Fig. 7 is the schematic diagram of the second three-dimensional control chart of adopting of an embodiment of the electric-control method of the oil supply system of the present invention motor that adopts Carburetor;
Fig. 8 is that the electric-control method of the oil supply system of the present invention motor that adopts Carburetor is at the control strategy figure (during symmetrical control) when gathering the SC sigmal control tonifying Qi solenoid valve of lambda sensor;
Fig. 9 is that the electric-control method of the oil supply system of the present invention motor that adopts Carburetor is at the control strategy figure (during asymmetrical control) when gathering the SC sigmal control tonifying Qi solenoid valve of lambda sensor.
Embodiment
Below in conjunction with accompanying drawing, describe the specific embodiment of the present invention in detail.
First, the composition of automatical control system of the oil supply system of the motor that adopts Carburetor is described in conjunction with Fig. 1-Fig. 5.
As shown in Figure 1, the automatically controlled system of the oil supply system of the motor of employing Carburetor comprises the ECU for controlling, it is electronic control unit, this is the core component in this system, on a MCU, concentrate and have ECU, various A/D(modulus) and D/A(digital-to-analogue) transducer is used for the conversion of digital and analog signaling, and power driving circuit is to drive the work of tonifying Qi solenoid valve and spark coil.
As shown in Figure 2, the control signal of ECU (being impulsive current) uses IGBT11 to be connected with the primary circuit of spark coil 12 by igniting, the secondary loop of spark coil 12 is connected with spark plug 13, the control signal of ECU is by IGBT(insulated gate bipolar transistor) 11 make the secondary loop of spark coil 12 produce instantaneous pressure, spark plug 13 igniting.
As shown in Figure 3, the control signal of ECU (being impulsive current) is by driving FET(field effect transistor) 21 be connected with the circuit of tonifying Qi solenoid valve 22, by controlling air inflow the on time of change tonifying Qi solenoid valve 22.
As shown in Figure 4, the electrical signal of temperature transducer 31 transmits by eliminator, through A/D circuit conversion, becomes digital signal to be sent to ECU, and temperature transducer 31 is arranged on the cylinder top of cylinder and sentences the temperature of measuring in cylinder.
As shown in Figure 5, the electrical signal of lambda sensor 41 transmits by eliminator, through A/D circuit conversion, becomes digital signal to be sent to ECU, and lambda sensor 41 is arranged on the exhaust ports of motor, the O in the waste gas of being discharged to detect
2concentration, according to O
2the concentration of gas mixture after Carburetor is processed of concentration judgement, determined that it is rare, overrich or moderate.O in waste gas
2concentration when large, illustrate that gas mixture is rarer, air content is wherein excessive, should reduce air compensation, to improve the output power of motor; O in waste gas
2concentration hour, illustrate that gas mixture is denseer, air content is wherein too small, should increase air compensation, makes full combustion of fuel, improves the discharge of motor.
Below in conjunction with Fig. 1-Fig. 7, illustrate that the oil supply system of embodiments of the invention adopts the electric-control method of the motor of Carburetor, comprises the steps:
The throttle opening that ECU receiving sensor collects and the signal of engine speed, same as the prior art for detection of the sensor of throttle opening and engine speed, do not repeat them here; Described ECU the first three-dimensional control chart that inquiry is pre-stored in described ECU according to throttle opening and engine speed is determined ignition advance angle, described the first three-dimensional control chart as shown in Figure 6, independent variable is throttle opening and engine speed, dependent variable is ignition advance angle, form three-dimensional figure, different throttle openings and ignition advance angle corresponding to engine speed difference, thereby form a curved surface, the shape of this three-dimensional control chart can according to the design parameter of motor with and the design parameter of the car load that mates with it through overtesting, determine.Described ECU is according to the time of ignition of inquired ignition advance angle control spark coil, even if also determine piston certain position igniting before reaching top dead center.The present embodiment to the motor adopting on Carburetor, can precisely be controlled the Electronic Fuel Injection (EFI) control principle value of moving engine igniting time, improves the output of motor.
As a kind of preferred version, in the present embodiment, ECU also further controls air fuel ratio according to throttle opening and engine speed:
Described ECU judges the operating mode of motor according to throttle opening and engine speed, and according to the be pre-stored in described ECU second three-dimensional control chart, determines the dutycycle of tonifying Qi solenoid valve; Described tonifying Qi solenoid valve is arranged on described Carburetor place, for the idling air flue to described Carburetor, carries out tonifying Qi to regulate the air fuel ratio of mixed gas; The independent variable of described the second three-dimensional control chart is throttle opening and engine speed, and dependent variable is the dutycycle of tonifying Qi solenoid valve.The shape of the second three-dimensional control chart as shown in Figure 7, be also according to the design parameter of motor with and the design parameter of the car load that mates with it through overtesting, determine.
As shown in Figure 1, the first three-dimensional control chart and the second three-dimensional control chart are pre-stored in ECU, can be connected with PC by special-purpose serial communication interface, can be according to practical service environment, by PC, the first three-dimensional control chart in ECU and the second three-dimensional control chart are modified, the first three-dimensional control chart and the second three-dimensional control chart are mated more with practical service environment, improve output and the discharge of motor.In order to improve the startability of motor, also according to temperature cylinder, ignition advance angle to be revised, the signal that the temperature transducer that the cylinder cylinder top that described ECU reception is arranged on motor is located collects is to determine temperature cylinder; Described ECU compensates and corrects time of ignition according to temperature cylinder: when temperature cylinder is during less than or equal to 0 ℃, increase ignition advance angle, ato unit while being conducive to low temperature, makes its working stability; When temperature cylinder is during greater than or equal to 40 ℃, reduce ignition advance angle, to reduce the generation of NOx in waste gas, thereby improve its discharge.More specifically, when temperature cylinder is during less than or equal to 0 ℃, ignition advance angle increases 10 °, and when temperature cylinder is between 30 ℃ and 40 ℃, ignition advance angle is constant, and correction value is zero, and when temperature cylinder equals 50 ℃, ignition advance angle reduces 1.5 °; When temperature cylinder is between 60 ℃-90 ℃, ignition advance angle reduces 2 °; When temperature cylinder is between 90 ℃-130 ℃, ignition advance angle reduces 2.5 °; When temperature cylinder is more than or equal to 130 ℃, ignition advance angle reduces 2 °.Interval as 60 ℃-90 ℃, includes starting point above, does not comprise terminal.It should be noted that, " compensation is revised " of the application's specification and claims indication all refers on the basis of the numerical value of finding from three-dimensional control chart and revises.
In addition, as preferred scheme, in the present embodiment, also according to temperature cylinder, adjust air fuel ratio, described ECU compensates and corrects the dutycycle of tonifying Qi solenoid valve according to temperature cylinder: when temperature cylinder is during less than or equal to 20 ℃, reduce the air compensation of tonifying Qi solenoid valve.Its objective is, the concentration of the mixed gas while increasing cold-starting, is more conducive to the startup of real vehicle under low-temperature condition, and can improve the discharge while starting.Particularly, when temperature cylinder is greater than 20 ℃, do not compensate, when temperature cylinder is greater than 0 ℃ during lower than 20 ℃, dutycycle reduces 50%, to reduce air inflow, improve air fuel ratio, when temperature cylinder is lower than 0 ℃, dutycycle reduces 100%, that is to say that tonifying Qi solenoid valve do not work, do not need tonifying Qi, further improve the concentration of mixed gas, motor also can be started smoothly when temperature is lower.
In order to improve the discharge of motor, meet the requirement of environmental regulation, the ECU of the present embodiment also further detects O in waste gas by being arranged at the lambda sensor of the exhaust ports of motor
2concentration signal air fuel ratio is controlled.Particularly, described ECU detects O in waste gas according to the lambda sensor that is installed on the exhaust ports of motor
2concentration signal the dutycycle of described tonifying Qi solenoid valve is controlled.Described ECU passes through to adjust the dutycycle of tonifying Qi solenoid valve, and changes its opening time, thereby changes the air quantity in mixed gas.The control signal of ECU is pulse signal, can be set as pulse signal when high petential, and tonifying Qi solenoid valve is in open mode (oppositely setting is also fine certainly).ECU determines the opening time of tonifying Qi solenoid valve by the feedback of lambda sensor, thereby changes O in waste gas
2concentration, change the signal of lambda sensor, form closed loop control.Concrete control procedure is as follows: described ECU is according to the O in waste gas
2concentration determine the air fuel ratio of current gas mixture, when gas mixture is dense state, described ECU increases air compensation and makes the O in waste gas by changing the dutycycle of described tonifying Qi solenoid valve
2to rare state adjustment; When gas mixture is rare state, described ECU reduces air compensation and makes the O in waste gas by changing the dutycycle of described tonifying Qi solenoid valve
2to dense state adjustment.It is pointed out that described dense state and rare state all take chemically correct fuel as with reference to determining, when the concentration ratio of the gas mixture mixer in chemically correct fuel is dense, think overrich, otherwise thought rare.The control target of gas mixture can be take chemically correct fuel and controlled as target, can certainly take and control as target lower than the concentration of chemically correct fuel, to realize lean combustion, reduces discharge, reduces fuel consumption.
In the present embodiment, described ECU by adjust dutycycle change air compensation take the detailed process that changes air fuel ratio as: when gas mixture is during as dense state, first with the form jump type of the first step function 100 increase dutycycle with, and then increase gradually dutycycle with the form of the first linear function 300, until gas mixture is rare state; When gas mixture is rare state, first the form jump type with the second step function 200 reduces dutycycle, and then reduces gradually dutycycle with the second linear function 400, until described gas mixture is dense state.
As preferred version, can adopt symmetrical control, as shown in Figure 8, described the first step function 100 equates with the step value of the second step function 200.The step value of described the first step function is more than or equal to 5% of former dutycycle, and the step value of described the second step function 200 is also more than or equal to 5% of former dutycycle; The absolute value of the slope of the first linear function 300 and the second linear function 400 equates.Like this, in one-period, it is rare identical with the time of overrich in crossing, and average air fuel ratio is identical with chemically correct fuel.That is to say, in Fig. 8, if the dutycycle while take the concentration of mixed gas in chemically correct fuel as zero point line (dotted line 500 in Fig. 8) is in the individual cycle, the integral value that represents the function of dutycycle is zero.Dotted line in Fig. 8 is also the mean value 500 of dutycycle, and when the control strategy adopting shown in Fig. 8, average dutycycle is 50%, now take chemically correct fuel as controlling target.The step value of the first step function 100 is generally more than or equal to 5% of former dutycycle, as 6% etc., but can select 4% numerical value such as grade, main points of the present invention are first to carry out a jump that Amplitude Ratio is larger, and then slowly change, can make like this ratio in overrich or excessively rare mixed gas first have greatly changed, approach quickly and control target (being generally chemically correct fuel).
Certainly, can also adopt asymmetrical control, as shown in Figure 9, the step of the first step function 100 and the second step function 200 value is unequal.Like this, can be by making the first step function 100 different with the step value of the second step function 200, or/and the first linear function 300 is different from the absolute value of the slope of the second linear function 400, make the mean value of dutycycle depart from 50%, make mixed gas in overrich or cross rare state.In Fig. 9, represent that the dotted line 500 of mean value of dutycycle is above 50%, illustrate that mixed gas works in overrich state.Certainly, can also be by the slope (in the situation of the shape invariance of the first step function 100 and the first linear function 300) that reduces the step value of the second step function 200 and reduce by the second linear function 400, make its mean value lower than 50%, make mixed gas in crossing rare state.According to the difference of controlling target, can select different control strategies.It is to be noted, in the application's specification and claims, the jump type of dutycycle is changed and adopts " step function " to be described, be intended in order to illustrate that its variation is jump type, in Fig. 8 and Fig. 9, the first step function 100 and the second step function 200 are not all desirable step functions (perpendicular to the straight line of transverse axis), all have certain slope, but the first step function 100 and the second step function 200 be all approximately perpendicular to transverse axis, explanation hereby.
Oil supply system of the present invention adopts the electric-control method of the motor of Carburetor, there is following beneficial effect: by the Electronic Fuel Injection (EFI) control principle value of moving to the motor adopting on Carburetor, can precisely control air fuel ratio, engine igniting time, thereby the motorcycle emission that makes to adopt this motor purifies to adapt to the emission standard of increasingly stringent more, also make the power stage of motor more optimize, promoted the driving performance of car load.
Certainly, the above is the preferred embodiment of the present invention, should be understood that; for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (10)
1. oil supply system adopts the electric-control method of the motor of Carburetor, it is characterized in that, comprises the steps:
The throttle opening that ECU receiving sensor collects and the signal of engine speed;
Described ECU the first three-dimensional control chart that inquiry is pre-stored in described ECU according to throttle opening and engine speed is determined ignition advance angle, and the independent variable of described the first three-dimensional control chart is throttle opening and engine speed, and dependent variable is ignition advance angle;
Described ECU is according to the time of ignition of inquired ignition advance angle control spark coil.
2. electric-control method as claimed in claim 1, is characterized in that, also comprises the steps:
Described ECU is according to the operating mode of throttle opening and engine speed judgement motor, and the pulse width modulation duty of the tonifying Qi solenoid valve of controlling according to the definite employing of the be pre-stored in described ECU second three-dimensional control chart pulse width modulation mode;
Described tonifying Qi solenoid valve is arranged on described Carburetor place, for the idling air flue to described Carburetor, carries out tonifying Qi to regulate the air fuel ratio of mixed gas; The independent variable of described the second three-dimensional control chart is throttle opening and engine speed, and dependent variable is the pulse width modulation duty of tonifying Qi solenoid valve.
3. electric-control method as claimed in claim 2, is characterized in that, also comprises the steps:
The signal that the temperature transducer that the cylinder cylinder top that described ECU reception is arranged on motor is located collects is to determine temperature cylinder;
Described ECU compensates and corrects time of ignition according to temperature cylinder: when temperature cylinder is during less than or equal to 0 ℃, increase ignition advance angle; When temperature cylinder is during higher than 40 ℃, reduce ignition advance angle.
4. electric-control method as claimed in claim 3, is characterized in that, also further comprises the steps:
Described ECU compensates and corrects the dutycycle of tonifying Qi solenoid valve according to temperature cylinder: when temperature cylinder is during less than or equal to 20 ℃, reduce the air compensation of tonifying Qi solenoid valve.
5. the electric-control method as described in claim 2-4 any one, is characterized in that, also comprises the steps:
Described ECU detects O in waste gas according to the lambda sensor that is installed on the exhaust ports of motor
2concentration signal the pulse width modulation duty of described tonifying Qi solenoid valve is controlled.
6. electric-control method as claimed in claim 5, is characterized in that,
Described ECU is according to the O in waste gas
2concentration determine the air fuel ratio of current gas mixture, when gas mixture is dense state, described ECU increases air compensation and makes the O in waste gas by changing the dutycycle of described tonifying Qi solenoid valve
2to rare state adjustment; When gas mixture is rare state, described ECU reduces air compensation and makes the O in waste gas by changing the dutycycle of described tonifying Qi solenoid valve
2to dense state adjustment.
7. electric-control method as claimed in claim 6, is characterized in that, described ECU by adjust dutycycle change air compensation take the detailed process that changes air fuel ratio as:
When gas mixture is dense state, first with the form jump type of the first step function increase dutycycle with, and then increase gradually dutycycle with the form of the first linear function, until gas mixture is rare state;
When gas mixture is rare state, first the form jump type with the second step function reduces dutycycle, and then reduces gradually dutycycle with the second linear function, until described gas mixture is dense state.
8. electric-control method as claimed in claim 7, is characterized in that, described the first step function equates with the step value of the second step function, and the absolute value of the slope of the first linear function and the second linear function also equates.
9. electric-control method as claimed in claim 7, is characterized in that, the absolute value of the slope of the step of described the first step function and the second step function value unequal and/or the first linear function and the second linear function is also unequal.
10. electric-control method as claimed in claim 8 or 9, is characterized in that, the step value of described the first step function is more than or equal to 5% of former dutycycle, and the step value of described the second step function is also more than or equal to 5% of former dutycycle.
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| CN107917003A (en) * | 2016-10-11 | 2018-04-17 | 联合汽车电子有限公司 | A kind of control method of engine smoothness of operation |
| CN108269324A (en) * | 2016-12-30 | 2018-07-10 | 中国移动通信集团公司 | A kind of coolant temperature monitoring method of engine and car networking service platform |
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