CN104033310A - Method for adjusting ignition advance angle of coke-oven gas engine by means of component detection - Google Patents

Abstract

The invention discloses a method for adjusting an ignition advance angle of a coke-oven gas engines by means of component detection. The method includes determining volume fractions of hydrogen, methane and carbon monoxide in gas on the basis of a methane sensor and a carbon monoxide sensor when components of coke-oven gas are changed; adjusting the ignition advance angles by the aid of incremental PID (proportion, integration and differentiation) controllers when the volume fractions of the hydrogen, the methane and the carbon monoxide meet certain conditions; updating the hydrogen, methane and carbon monoxide volume fractions in an EEPROM (electrically erasable programmable read-only memory) via a self-learning module. The method has the advantages that difference values of the components of the gas and initial values stored in a control unit are inputted, the components of the gas are measured by the sensors, and accordingly the ignition advance angle of the coke-oven gas engine can be corrected under the joint effects of the three incremental PID controllers.

Description

A kind of method of being adjusted coke-oven gas engine ignition advance angle by composition detection

Technical field

The invention belongs to motor field of engineering technology, relate to a kind of method of being adjusted coke-oven gas engine ignition advance angle by composition detection.Be applicable to the current coke-oven gas engine by gasoline engine refitting, can realize in the time that oven gas composition changes the self adaptive control fast and accurately of coke-oven gas engine ignition advance angle.

Background technique

Along with the fast development of automotive industry, its huge energy consumption has threatened national the energy safety of supply, and meanwhile, a large amount of tail gas of discharge have also directly threatened ecotope and human health.Clean Vehicle Alternative Fuels has become the important topic of various countries' research, wherein Aalcohols fuel and gaseous fuel are most widely used substitute fuels, but than Aalcohols fuel, gaseous fuel occupies huge advantage in all many-sides such as resource, economy, discharge, safety, is the first-selected substitute fuel of current automobile.In conjunction with China's national situation, oven gas is a kind of desirable clean alternative fuel.

At present, coke-oven gas engine is directly to transform on the basis of petrol engine, has retained the control strategy of petrol engine.But, the oven gas composition of coking gas after by purification plant is (gasolene ingredient is thought to fix) complicated and changeable, 55-60% hydrogen, the combustible component of 23-28% methane and 5-8% carbon monoxide, 3-5% nitrogen, the non-combustible composition of 1-3% carbon dioxide and other gases of 3-4%, volume fraction that it is generally acknowledged the combustible component of oven gas is 90%, this specific character of oven gas has determined that coke-oven gas engine adjusting aspect some control, especially for the control of ignition advance angle, ignition advance angle directly affects engine output, fuel consumption, the noxious emission that Automobile drive performance and burning generate.For petrol engine, its ignition advance angle is made up of basic ignition advance angle and correction ignition advance angle: wherein revise ignition advance angle and comprise warming-up correction, idle stability correction, air-fuel ratio feedback correction, overheated correction, detonation correction etc.; And for coke-oven gas engine, on the basis of gasoline engine ignition control strategy, certainly will need to increase the ignition advance angle correction that is changed generation by oven gas gas componant.

Summary of the invention

The object of the invention is to propose a kind of method of adjusting coke-oven gas engine ignition advance angle by oven gas composition detection.In the time that oven gas component changes, determine the volume fraction of hydrogen in combustion gas, methane, carbon monoxide based on methane transducer and carbon monoxide transducer, in the time that the volume fraction of hydrogen, methane and carbon monoxide meets certain condition, adjust ignition advance angle by increment type PID controller, and upgrade the volume fraction of hydrogen in EEPROM, methane and carbon monoxide by self-learning module.

Technological scheme of the present invention: the present invention is the method for adjusting coke-oven gas engine ignition advance angle by oven gas composition detection, the steps include:

The first step: methane transducer is surveyed methane composition in combustion gas, determines methane volume fraction in combustion gas

Second step: carbon monoxide transducer is surveyed carbon monoxide composition in combustion gas, determines carbon monoxide volume fraction

The 3rd step: obtain methane volume fraction real-time in combustion gas carbon monoxide volume fraction with hydrogen volume mark the initial value of three kinds of compositions in contrast EEPROM, and then obtain error amount with

The 4th step: will with as the input parameter of increment type PID controller, calculate ignition advance angle correction value respectively

The 5th step: upgrade with write EEPROM.

Beneficial effect of the present invention is:

(1) the invention has the advantages that according to methane transducer and carbon monoxide transducer and measure methane volume fraction in combustion gas, carbon monoxide volume fraction and hydrogen volume mark, in the time that three kinds of combustible components meet certain condition with the interpolation that is stored in control unit initial value, by increment type PID controller, the ignition advance angle of coke-oven gas engine is revised the speed of engine self-adaptive control while improving gas component change.

(2) the present invention is that the propellant composition obtaining taking sensor measurement and the difference that is stored in control unit initial value are input, by the acting in conjunction of three increment type PID controllers, to revise the ignition advance angle of coke-oven gas engine.Increment type PID control has higher control accuracy, and can not cause larger fluctuation to ignition advance angle, has ensured the smoothness of engine operation.Meanwhile, increment type PID control has higher robustness, adopts increment type PID control can improve the robustness of engine system as method for correcting.

(3) self-learning module is also had in the present invention.When gas component is when being stored in the initial value sustainable existence certain error of control unit, the initial value of gas component in automatically updated EEPROM, to improve control rate, and ensures the properties of coke-oven gas engine operation.

Brief description of the drawings

Fig. 1 adopts coke-oven gas engine control block diagram of the present invention.

Fig. 2 is the coke-oven gas engine gas component ignition advance angle correction algorithm modular structure schematic diagram based on methane transducer and carbon monoxide transducer.

Fig. 3 is the main flow chart of the coke-oven gas engine gas component ignition advance angle correction algorithm based on methane transducer and carbon monoxide transducer.

Embodiment

Below in conjunction with accompanying drawing, the invention will be further described.

Fig. 1 adopts coke-oven gas engine control block diagram of the present invention.

Coke-oven gas engine is to improve on the basis of petrol engine, increases air feed track, and critical piece comprises gas cylinder, pressurizing valve and sensor.Coke-oven gas engine is aspect the control of ignition advance angle, keeping on the basis of the original control strategy of petrol engine, determine that by gathering various types of signal engine operating condition is with every ignition advance angle correction values such as the basic ignition advance angle determined and warming-up correction, idle stability correction, air-fuel ratio feedback correction, overheated correction, detonation corrections, more additional by be subject to that gas component affects ignition advance angle correction value.

This control block diagram has increased the ignition advance angle correction algorithm module that the coke-oven gas engine based on methane transducer and carbon monoxide transducer is affected by gas component on the basis of former control strategy, to improve the indices of coke-oven gas engine on in-cylinder combustion, ensure the properties of motor operation.

Fig. 2 is the coke-oven gas engine gas component ignition advance angle correction algorithm modular structure schematic diagram based on methane transducer and carbon monoxide transducer.

To determining of oven gas engine gas composition, mainly refer to determining its combustible component, namely for methane, carbon monoxide and hydrogen, and because these three kinds of combustible components certainly will change in certain limit, therefore respectively the amount of methane, carbon monoxide and hydrogen is revised by three increment type PID controllers, finally shown in the control for coke-oven gas engine ignition advance angle.

Fig. 3 is the main flow chart of the coke-oven gas engine gas component ignition advance angle correction algorithm based on methane transducer and carbon monoxide transducer.

The concrete steps of this method are:

The first step: methane transducer is surveyed methane composition in combustion gas, determines methane volume fraction in combustion gas

Second step: carbon monoxide transducer is surveyed carbon monoxide composition in combustion gas, determines carbon monoxide volume fraction

The 3rd step: obtain methane volume fraction real-time in combustion gas carbon monoxide volume fraction with hydrogen volume mark the initial value of three kinds of compositions in contrast EEPROM, and then obtain error amount with

The 4th step: will with as the input parameter of increment type PID controller, calculate ignition advance angle correction value respectively

${\mathrm{\Δ\θ}}_{\mathrm{ig}}=[{\mathrm{\Δ\θ}}_{{\mathrm{CH}}_4}+{\mathrm{\Δ\θ}}_{\mathrm{CO}}+{\mathrm{\Δ\θ}}_{H_2}]$

Wherein, $a_1=K_P(1+\frac{T}{T_I}+\frac{T_D}{T}),a_2=-\frac{K_P}{(1+\frac{{2T}_D}{T})},a_3{=K}_P\frac{T_D}{T};$ [] represents to round, and subscript represents continuously not homogeneous sampled value, K _prepresent scaling factor; T _irepresent intergration time, unit is second; T _drepresent derivative time, unit is second; T represents the sampling period, and unit is second.

The 5th step: upgrade with write EEPROM.

Claims (1)

1. a method of being adjusted coke-oven gas engine ignition advance angle by composition detection, is characterized in that comprising the following steps:

The first step: methane transducer is surveyed methane composition in combustion gas, determines methane volume fraction in combustion gas

Second step: carbon monoxide transducer is surveyed carbon monoxide composition in combustion gas, determines carbon monoxide volume fraction

The 3rd step: obtain methane volume fraction real-time in combustion gas carbon monoxide volume fraction with hydrogen volume mark the initial value of three kinds of compositions in contrast EEPROM, and then obtain error amount with

The 4th step: will with as the input parameter of increment type PID controller, calculate ignition advance angle correction value respectively

${\mathrm{\Δ\θ}}_{\mathrm{ig}}=[{\mathrm{\Δ\θ}}_{{\mathrm{CH}}_4}+{\mathrm{\Δ\θ}}_{\mathrm{CO}}+{\mathrm{\Δ\θ}}_{H_2}]$

Wherein

$a_1=K_P(1+\frac{T}{T_I}+\frac{T_D}{T}),a_2=-\frac{K_P}{(1+\frac{{2T}_D}{T})},a_3{=K}_P\frac{T_D}{T};$

[] represents to round, subscript 1,2, and 3 represent respectively continuous three sampled values, K _prepresent scaling factor; T _irepresent intergration time, unit is second; T _drepresent derivative time, unit is second; T represents the sampling period, and unit is second;

The 5th step: upgrade with write EEPROM.