CN101149035A - Igniting method for energy-saving environment-friendly type gasoline engine - Google Patents

Abstract

The energy saving environment friendly gasoline engine igniting method features that in certain operation condition, the igniter under the control of the monolithic computer control circuit ignites in the optimized igniting point to reach maximum output rotation speed or output power, with the optimizing degree being proportional directly to the operation speed of the computer system. The present invention has adaptively regulated ignition time and optimized ignition, and is suitable for gasoline engine in automobile, motorcycle, etc.

Description

Igniting method for energy-saving environment-friendly type gasoline engine

Technical field

The present invention relates to a kind of igniting method for energy-saving environment-friendly type gasoline engine.

Background technique

The power of petrol engine is from the burning of inflammable mixture in the gasoline engine cylinder, and whether improving of burning directly has influence on the driving power that petrol engine is exported.Good burning must possess following three conditions, i.e. good mixing gas, compression fully and best igniting.Wherein, igniting comprises time of ignition and ignition energy, and ignition energy has not been the problem of puzzlement ignition system at present.Time of ignition or ignition advance angle are then more crucial, because it is one of most important parameters that influences gasoline engine performance, and the too early or slow excessively Economy and the power character that all can directly have influence on petrol engine of igniting.So, all exist an optimum igniting advance angle corresponding to given petrol engine operating conditions, therefore, the technological progress of igniter is mainly reflected in again in the control of ignition advance angle.The present digital igniter of the single chip machine controlling circuit that adopts of domestic-developed also has a certain distance with the optimum igniting advance angle rule of reality, can't realize optimum igniting in principle at all.

Summary of the invention

Purpose of the present invention is exactly at above-mentioned deficiency, and a kind of controlling method of maximum possible convergence optimum igniting point is provided.Its principle can simply be summed up as under certain arbitrarily operating mode, igniter is lighted a fire at as close as possible optimum igniting point place under the control of single-chip microcomputer digital control circuit, its convergence degree is directly proportional with the arithmetic speed of system, and it is the highest to make the motor output speed be that output power reaches.

Because native system do not preset so-called non-existent at all optimum igniting curve, but adjust firing time according to the operating mode self adaption of motor, this has just guaranteed that native system realizes optimum igniting under any operating mode of any motor.

Embodiment

In order to realize the present invention, at first must monitor in real time engine speed, not only increased system cost if additionally install velocity transducer additional, and because the increase of components and parts has reduced the reliability of system on the contrary.It is to carry out timing by the time lag that spark coil is produced pulse to realize that spark coil is not only the position reference sensor of system's igniting in native system that the present invention monitors in real time to engine speed, also is the velocity transducer of system simultaneously.The pulse that spark coil produces is through shaping circuit shaping, amplitude limit, be sent to the single-chip microcomputer input end, single-chip microcomputer is through anti-interference process and after confirming as useful signal, single-chip microcomputer is sent to register N1 with the data in the timer (i.e. the blanking time of two firing pulses), simultaneously with the zero clearing of single-chip microcomputer timer and restart, the new timing once of beginning.Compare with the blanking time that is kept at the firing pulse of the last time among the single-chip microcomputer register N2 blanking time that is sent to the firing pulse of register N1, can determine that whether motor quickens.After relatively finishing, the data of register N1 are sent to register N2, for rotating ratio is more ready next time, the difference DELTA W with N1 and N2 is sent to register N3 simultaneously.Ignition point should be before piston reaches the peak that can reach in the cylinder during engine operation (this time we temporary appellation electronic spark advance time T), because this time of influence of various factors is not a normal value, this just makes ignition advance angle and engine speed not linear between the two, but a unknown curve that is associated with engine operating condition.The firing pulse coil can provide more satisfactory firing pulse for motorcycle initiating and idling stage, and along with the raising of engine speed, desirable firing pulse should appear at before the pulse of firing pulse coil output, (being that so-called ignition advance angle should increase).Can be coagulated and formed by many straight lines according to any as can be known curve of differential principle, its degree of approximation be with relevant with the quantity of straight line with fixed attention.We can suppose to light a fire pre-set time T is a constant in certain engine speed range according to the differential principle, can be expressed as K1=M1+M2, wherein K1 is quantified as the value of single-chip microcomputer sprocket pulse for the electronic spark advance time T, M2 is that spark coil produces the quantized value that pulse to piston reaches the peak needed time that can reach in the cylinder, and M1 is that system sends firing pulse produces the pulse needed time to spark coil quantized value.But M2 approximate representation again is M2=W2/K2, and wherein W2 is the quantized value of engine revolution one all needed times, because W2 changes delta W corresponding M 2 changes delta M2, because K1=M1+M2 is a constant, M1 is changed to-Δ M2 accordingly, M1B=M1A-Δ M2.Our default constant k2 when motor is started working, because Δ W can survey, system sends firing pulse and can calculate to the quantized value M1 that spark coil produces the pulse needed time, sends firing pulse according to M1 value single-chip microcomputer.After-Δ W was less than a setting value, we should have fuzzy control principle that the K2 value is optimized, and made the M1 value reach optimum.When motor quickens (Δ W greater than certain value time) we carry out work with default K2, we are optimized K2 value near at the uniform velocity the time when motor, working state reaches optimum when making motor at the uniform velocity.At the uniform velocity so native system can make engine operation in the optimum state to motor to greatest extent, reaches the fuel-economizing purpose much larger than the acceleration, deceleration operating time operating time in general.Experimental result provides strong evidence to this.

Claims (3)

1. igniting method for energy-saving environment-friendly type gasoline engine, it is characterized in that: under certain operating mode, igniter is lighted a fire at as close as possible optimum igniting point place under the control of single-chip microcomputer digital control circuit, its convergence degree is directly proportional with the arithmetic speed of system, and it is the highest to make the motor output speed be that output power reaches.

2. igniting method for energy-saving environment-friendly type gasoline engine according to claim 1, it is characterized in that: native system obtains the petrol engine running parameter in real time by position and velocity transducer, single-chip microcomputer is used fuzzy control and differential principle in the system, take all factors into consideration the various factors that influences the optimum igniting point time, send fire signal firing time thereby calculate by certain algorithm.

3. igniting method for energy-saving environment-friendly type gasoline engine according to claim 1, it is characterized in that: native system is by following the trail of the engine speed feedback signal, to being optimized firing time, make this optimum igniting point constantly of native system that reaches firing time in real time.