CN101943070B - Control method of motorcycle engine electronic injection system open-loop air-fuel ratio - Google Patents

Abstract

The invention provides a control method of a motorcycle engine electronic injection system open-loop air-fuel ratio, aiming to solve the problems that the air-fuel ratio can not be automatically regulated along with the performance difference in the production process and the state change after use because the motorcycle engine closed-loop control electronic injection system has no regulation mechanism for the open-loop oil injection amount in the prior art. The control method of the invention comprises the following steps: predetermining or calculating the eta learning value corrected value of the learning correction factor of a certain operating point in different gear open-loop states of a motorcycle engine; dividing operating areas according to the eta learning value correction value of each operating point; and adjusting the oil injection amount when the motorcycle runs in the corresponding operating area by adopting the eta learning value correction value. The beneficial effect of the invention is as follows: when entering into the open-loop operation, the motorcycle engine can regulate the oil injection amount to be about the set value to lead the engine to be kept at the better working condition.

Description

The controlling method of motorcycle engine electric spray system open loop situations air fuel ratio

Technical field

The present invention relates to a kind of controlling method of motorcycle engine electronic injection control system air fuel ratio, specially refer to a kind of controlling method of motorcycle engine electronic injection control system open loop situations air fuel ratio.

Background technique

At present, motorcycle engine electronic injection control system is after the exhaust passage installs lambda sensor additional, by identifying the oxygen content in the engine exhaust and feeding back to electric injection system controller (being designated hereinafter simply as ECU), ECU enters the fuel injection quantity of motor according to the oxygen content adjustment in the exhaust, adjust thus the ratio (referred to as air fuel ratio) of engine air and fuel, make engine operation near theoretical air fuel ratio, with the discharging that reduces pollutant and the transformation efficiency that guarantees triple-effect catalytic unit.Yet, the employed lambda sensor of motorcycle electric spraying control system mostly is the switch type lambda sensor, as its name suggests, this lambda sensor can only react (so-called " opening " or " pass ") to some extent when air fuel ratio is partially dense or partially rare, and can't react to some extent the partially dense or partially rare degree of air fuel ratio.Therefore, when the oxygen content substantial deviation in the exhaust, this lambda sensor can't be adjusted fuel injection quantity by ECU.Usually lambda sensor can be referred to as the closed loop state by the working state that ECU adjusts fuel injection quantity, lambda sensor can't be referred to as open loop situations by the working state that ECU adjusts fuel injection quantity.But, motorcycle engine is not all to require engine operation under the various operating modes near theoretical air fuel ratio, for example at starting a cold engine and warm-up period, the temperature of motor does not reach and enters before the closed loop state requires, and air fuel ratio should be in the stability of partially dense state to guarantee to burn; At full load and anxious boost phase, in order to guarantee good power character, require equally air fuel ratio to be in partially dense state.In view of this, motorcycle engine normally is operated in closed loop state or open loop situations, and between is changed mutually.

In the motorcycle development process, factory usually just carries out the coupling of motor and car load for the motorcycle of several in certain vehicle or small lot, namely the silencing apparatus at the coupling sample car installs linear oxygen sensors additional, detect the coupling sample car in the air fuel ratio of open loop situations by linear oxygen sensors, thereby setup control parameter comparatively exactly, control coupling sample car is in zone of reasonableness in the air fuel ratio of open loop situations, makes it be operated in preferable states.And having very large scattered error between the motorcycle of producing in enormous quantities, the motorcycle coupling of several or small lot can not represent by the gross motorcycle and can both work under better air fuel ratio state.In addition, in the using process of motorcycle, motor can progressively produce the variation (as: engine aging, obstruction, decrease in efficiency etc.) of state, adopt the control parameter of original coupling, air fuel ratio in the time of just can not guaranteeing the motorcycle operation is in zone of reasonableness, be that match parameter is not suitable with the change of state in the using process of the scattered error of motorcycle and motorcycle, thereby so that abominable variation occur in the discharging of motorcycle, oil consumption and power.In these cases, if engine operation is under the closed loop control state, ECU is by the feedback signal of lambda sensor, the real-time air fuel ratio of adjusting can adapt to the scattered error of the generation in the vehicle manufacturing and use the rear change of state that occurs, the air fuel ratio of car load is remained near the chemically correct fuel, to reduce the transformation efficiency of discharging and assurance triple-effect catalytic unit.But under open loop situations, can not utilize the feedback signal of lambda sensor, can not adjust air fuel ratio with the scattered error that adapts to the generation in the vehicle manufacturing and the change of state of using rear appearance in good time.

Summary of the invention

There is not regulation mechanism for solving prior art motorcycle engine closed loop control electric injection system open loop situations fuel injection quantity, can not be with the performance scattered error that occurs in the production process and the change of state after using and the problem of Self-adjustment air fuel ratio, the present invention proposes a kind of controlling method of motorcycle engine electric spray system open loop situations air fuel ratio.Motorcycle engine is measured or calculated to the controlling method of motorcycle engine electric spray system open loop situations air fuel ratio of the present invention in advance at the study correction factor η of a certain operating point of different gear open loop situations _{The learning value correction}Value, according to the η of each operating point _{The learning value correction}Value is divided the operating mode zone, adopts η _{The learning value correction}Value is adjusted the fuel injection quantity of motorcycle when corresponding operating mode area operation, the operating point of described motor is that mean engine is in the operation point of a certain rotating speed and load, described operating mode zone is that mean engine is worked in a certain rotating speed and load range, and described engine load refers to the aperture of engine air throttle.

Motorcycle engine is measured or calculated to the controlling method of motorcycle engine electric spray system open loop situations air fuel ratio of the present invention in advance at the study correction factor η of a certain operating point of different gear open loop situations _{The learning value correction}Value, comprise, the control motorcycle engine electronic injection control system forces to enter the closed loop learning state when motor enters open loop situations, the control engine gear arrives respectively time top gear in the zero span, the control engine throttle opening makes engine speed be in closed loop state rotating speed CLV ceiling limit value n_clmax near the stable operation mid point between the engine peak speed n max, measures thus the η of the corresponding rotating speed operating point from neutral to inferior top gear _{The learning value correction}Value is again according to the η of neutral to each operating point of time top gear _{The learning value correction}The mean value of value or weighted mean value obtain the η of top gear operating point _{The learning value correction}Value.

Further, the alleged control motorcycle engine electronic injection control system of the controlling method of motorcycle engine electric spray system open loop situations air fuel ratio of the present invention forces to enter the closed loop learning state when motor enters open loop situations, comprise, electric injection system controller ECU cancels the ceiling restriction of rotating speed and the load of original closed loop control setting state, simultaneously, target air-fuel ratio correction factor η _{1/ λ}Value is 1.

The controlling method of motorcycle engine electric spray system open loop situations air fuel ratio of the present invention is according to the η of each operating point _{The learning value correction}Value is divided the operating mode zone, comprises that establishing the means for gear-location of motor-cycle number is N, comprises neutral or zero span, obtains N operating point, i.e. P by mensuration or calculating ₀, P ₁, P ₂... P _N-1The η of operating point _{The learning value correction}Value, the load value that each operating point is corresponding is respectively L ₀, L ₁, L ₂... L _N-1, the mean value of every adjacent two load values is operating mode area limit line, i.e. a L ₀₁=(L ₁+ L ₁)/2, L ₀₂=(L ₁+ L ₂)/2....... tries to achieve N-1 bar operating mode area limit line by that analogy, then, with 0 to L ₀₁Between be divided into operating mode zone, i.e. a G ₀₁G ₀₁To L ₀₂Between be divided into operating mode zone, i.e. a G ₀₂... by that analogy, open loop situations is divided into N operating mode zone.

The controlling method of motorcycle engine electric spray system open loop situations air fuel ratio of the present invention adopts η _{The learning value correction}Value is adjusted the fuel injection quantity of motorcycle when open loop situations is moved, and comprises, with operating point P ₁, P ₁, P ₂... P _Nη _{The learning value correction}Value and operating mode zone G ₀₁, G ₀₂... G _1NCorresponding one by one, the η in this operating mode zone of Automatically invoked when motor enters a certain operating mode area operation of open loop situations _{The learning value correction}Value is revised fuel injection quantity, at this moment, and the total fuel injection quantity Q of motor _AlwaysCalculated by following formula:

Q _Always=Q _{Substantially}* η _{Transient state}* η _{1/ λ}* η _{O2 revises}* η _{The learning value correction}

Wherein:

Q _{Substantially}That motor is at the basic fuel injection amount according to air inflow and chemically correct fuel calculating of this operating point;

η _{Transient state}Being fuel injection quantity transient state correction factor, is that manipulation factor according to the driver causes when engine transient changes the correction to Engine Injection Mass, η when engine steady state is moved _{Transient state}Coefficient is 1;

η _{1/ λ}The target air-fuel ratio correction factor, at closed loop operating mode zone η _{1/ λ}Coefficient is 1, at open loop operating mode zone η _{1/ λ}Coefficient value is 1.1～1.15;

η _{O2 revises}Being the Closed-cycle correction coefficient, is mean engine when operating in the closed loop control state, the correction value of the real-time fuel injection quantity that calculates according to the feedback signal of lambda sensor; η when the closed loop state _{O2 revises}Coefficient changes η when open loop situations near 1 _{O2 revises}Coefficient is 1;

η _{The learning value correction}Being fuel injection quantity study correction factor, is that the current motor of expression and electric injection system are in a certain operating mode zone and the motor of the state of demarcation and the correction value of the difference between the electric injection system.

The beneficial effect of the controlling method of motorcycle engine electric spray system open loop situations air fuel ratio of the present invention is fuel injection quantity can be adjusted to when motorcycle engine enters the open loop situations operation near the setting value, make motor remain at better working state, strengthen electric spray control system to the adaptive capacity of the change of state that occurs in the performance scattered error that produces in the motorcycle production process and the using process, satisfied better power character, the Economy requirement of batch product motorcycle.

Description of drawings

Accompanying drawing 1 is the operating mode schematic representation with motorcycle engine operation of 6 gears (comprising neutral or zero span).Be further described below in conjunction with the controlling method of the drawings and specific embodiments to motorcycle engine electric spray system open loop situations air fuel ratio of the present invention.

Embodiment

Accompanying drawing 1 is the operating mode schematic representation with motorcycle engine operation of 6 gears (comprising neutral or zero span), and among the figure, abscissa is engine speed, and y coordinate is engine load.As seen from the figure, the tetragonal operating mode zone that is made of n_idle, n_cl_max, L0, L_cl_max is the closed loop state of so-called motor.At the closed loop state, lambda sensor can be adjusted fuel injection quantity by ECU, makes engine operation near air fuel ratio remains on chemically correct fuel, with the discharging that reduces pollutant and the transformation efficiency that guarantees triple-effect catalytic unit.Be open loop situations to maximum speed n_max and the formed zone of maximum load L5 beyond this quadrilateral.When motor operated in open loop situations, lambda sensor can't be adjusted fuel injection quantity by ECU, and therefore, motor can not guarantee that it is operated in preferable states.Usually, motor is in normal mutually conversion between closed loop control state or open loop situations in service.

There is not regulation mechanism for solving prior art motorcycle engine closed loop control electric injection system open loop situations fuel injection quantity, can not be with the performance scattered error that occurs in the production process and the change of state after using and the problem of Self-adjustment air fuel ratio, the present invention proposes a kind of controlling method of motorcycle engine electric spray system open loop situations air fuel ratio.Motorcycle engine is measured or calculated to the controlling method of motorcycle engine electric spray system open loop situations air fuel ratio of the present invention in advance at the study correction factor η of a certain operating point of different gear open loop situations _{The learning value correction}Value, according to the η of each operating point _{The learning value correction}Value is divided the operating mode zone, adopts η _{The learning value correction}Value is adjusted the fuel injection quantity of motorcycle when corresponding operating mode area operation, the operating point of described motor is that mean engine is in the operation point of a certain rotating speed and load, described operating mode zone is that mean engine is worked in a certain rotating speed and load range, and described engine load refers to the aperture of engine air throttle.

Motorcycle engine is measured or calculated to the controlling method of motorcycle engine electric spray system open loop situations air fuel ratio of the present invention in advance at the study correction factor η of a certain operating point of different gear open loop situations _{The learning value correction}Value, comprise, the control motorcycle engine electronic injection control system forces to enter the closed loop learning state when motor enters open loop situations, the control engine gear arrives respectively time top gear in the zero span, the control engine throttle opening makes engine speed be in closed loop state rotating speed CLV ceiling limit value n_cl_max near the stable operation mid point between the engine peak speed n_max, measures thus the η of the corresponding rotating speed operating point from neutral to inferior top gear _{The learning value correction}Value is again according to the η of neutral to each operating point of time top gear _{The learning value correction}The mean value of value or weighted mean value obtain the η of top gear operating point _{The learning value correction}Value.In order to make motor also have learning functionality in open loop situations, when needing motorcycle engine electronic injection control system when motor enters open loop situations, to force to enter the closed loop learning state, comprise, electric injection system controller ECU cancels the ceiling restriction of rotating speed and the load of original closed loop control setting state, simultaneously, target air-fuel ratio correction factor η _{1/ λ}Value is 1.

K0, K1, K2, K3, K4, K5 curve represent that respectively motorcycle engine is in neutral, 1 gear, 2 gears, 3 gears, 4 gears, the 5 whens gear curve that the operating point of (except the neutral) process connects into that at the uniform velocity travels on level road in the accompanying drawing 1; P0, P1, P2, P3, P4, P5 point are respectively on K0, K1, K2, K3, K4, the K5 curve, engine speed is in closed loop control rotating speed CLV ceiling limit value n_cl_max near the operating point of the stable operation mid point between the engine peak speed n_max, and, by measuring in advance or calculate the η that has obtained P0, P1, P2, P3, P4, P5 operating point _{The learning value correction}Value.

By figure also as can be known, operating point P0, P1, P2, P3, load value that P4, P5 are corresponding are respectively L ₀, L ₁, L ₂, L ₃, L ₄, L ₅, adopting the mean value of every adjacent two load values is that an operating mode area limit line can be tried to achieve 5 operating mode area limit lines, i.e. L ₀₁=(L ₀+ L ₁)/2, L ₀₂=(L ₁+ L ₂)/2, L ₀₃=(L ₂+ L ₃)/2, L ₀₄=(L ₃+ L ₄)/2, L ₀₅=(L ₄+ L ₅)/2, then, with 0 to L ₀₁Between be divided into operating mode zone, i.e. a G ₀₁L ₀₁To L ₀₂Between be divided into operating mode zone, i.e. a G ₀₂L ₀₂To L ₀₃Between be divided into operating mode zone, i.e. a G ₀₃L ₀₃To L ₀₄Between be divided into operating mode zone, i.e. a G ₀₄L ₀₄To L ₀₅Between be divided into operating mode zone, i.e. a G ₀₅L ₀₅More than be operating mode zone, i.e. a G ₀₆η with operating point P0, P1, P2, P3, P4 and P5 _{The learning value correction}Value and operating mode zone G ₀₁, G ₀₂, G ₀₃, G ₀₄, G ₀₅And G ₀₆Corresponding one by one, i.e. operating mode zone G ₀₁η _{The learning value correction}Value is the η of operating point P0 _{The learning value correction}Value, operating mode zone G ₀₂η _{The learning value correction}Value is the η of operating point P1 _{The learning value correction}Value, by that analogy.

The controlling method of motorcycle engine electric spray system open loop situations air fuel ratio of the present invention adopts η _{The learning value correction}Value is adjusted the fuel injection quantity of motorcycle when open loop situations is moved, and comprises, with the η of operating point P0, P1, P2, P3, P4 and P5 _{The learning value correction}Value and operating mode zone G ₀₁, G ₀₂, G ₀₃, G ₀₄, G ₀₅And G ₀₆Corresponding one by one, i.e. operating mode zone G ₀₁η _{The learning value correction}Value is the η of operating point P0 _{The learning value correction}Value, operating mode zone G ₀₂η _{The learning value correction}Value is the η of operating point P1 _{The learning value correction}Value, by that analogy; The η in this operating mode zone of Automatically invoked when motor enters a certain operating mode area operation of open loop situations _{The learning value correction}Fuel injection quantity is revised, than the time, the total fuel injection quantity Q of motor _AlwaysCalculated by following formula:

Q _Always=Q _{Substantially}* η _{Transient state}* η _{1/ λ}* η _{O2 revises}* η _{The learning value correction}

Wherein:

Q _{Substantially}That motor is at the basic fuel injection amount according to air inflow and chemically correct fuel calculating of this operating point;

η _{Transient state}Being fuel injection quantity transient state correction factor, is that manipulation factor according to the driver causes when engine transient changes the correction to Engine Injection Mass, η when engine steady state is moved _{Transient state}Coefficient is 1;

η _{1/ λ}The target air-fuel ratio correction factor, at closed loop operating mode zone η _{1/ λ}Coefficient is 1, at open loop operating mode zone η _{1/ λ}Coefficient value is 1.1～1.15;

η _{O2 revises}Being the Closed-cycle correction coefficient, is mean engine when operating in the closed loop control state, the correction value of the real-time fuel injection quantity that calculates according to the feedback signal of lambda sensor; η when the closed loop state _{O2 revises}Coefficient changes η when open loop situations near 1 _{O2 revises}Coefficient is 1;

η _{The learning value correction}Being fuel injection quantity study correction factor, is that the current motor of expression and electric injection system are in a certain operating mode zone and the motor of the state of demarcation and the correction value of the difference between the electric injection system.

For example, enter G when motorcycle engine ₀₃During the operating mode zone, the η of engine electric spray control system meeting Automatically invoked P2 operating point _{The learning value correction}Fuel injection quantity is revised; When motorcycle engine enters again G ₀₁During the operating mode zone, the η of engine electric spray control system meeting Automatically invoked P0 operating point _{The learning value correction}Fuel injection quantity is revised.

Claims (4)

1. the controlling method of a motorcycle engine electric spray system open loop situations air fuel ratio is characterized in that: measure in advance or calculate motorcycle engine at the study correction factor η of a certain operating point of different gear open loop situations _{The learning value correction}Value, according to the η of each operating point _{The learning value correction}Value is divided the operating mode zone, adopts η _{The learning value correction}Value is adjusted the fuel injection quantity of motorcycle when corresponding operating mode area operation, the operating point of described motor is that mean engine is in the operation point of a certain rotating speed and load, described operating mode zone is that mean engine is worked in a certain rotating speed and load range, and described engine load refers to the aperture of engine air throttle; Described in advance mensuration or calculating motorcycle engine are at the study correction factor η of a certain operating point of different gear open loop situations _{The learning value correction}Value, comprise, the control motorcycle engine electronic injection control system forces to enter the closed loop learning state when motor enters open loop situations, the control engine gear arrives respectively time top gear in the zero span, the control engine throttle opening makes engine speed be in closed loop state rotating speed CLV ceiling limit value n_cl_max near the stable operation mid point between the engine peak speed n_max, measures thus the η of the corresponding rotating speed operating point from neutral to inferior top gear _{The learning value correction}Value is again according to the η of neutral to each operating point of time top gear _{The learning value correction}The mean value of value or weighted mean value obtain the η of top gear operating point _{The learning value correction}Value.

2. the controlling method of described motorcycle engine electric spray system open loop situations air fuel ratio according to claim 1, it is characterized in that: the control motorcycle engine electronic injection control system forces to enter the closed loop learning state when motor enters open loop situations, comprise, electric injection system controller ECU cancels the ceiling restriction of rotating speed and the load of original closed loop control setting state, simultaneously, target air-fuel ratio correction factor η _{1/ λ}Value is 1.

3. the controlling method of described motorcycle engine electric spray system open loop situations air fuel ratio according to claim 1 is characterized in that: according to the η of each operating point _{The learning value correction}Value is divided the operating mode zone, comprises that establishing the means for gear-location of motor-cycle number is N, comprises neutral or zero span, obtains N operating point, i.e. P by mensuration or calculating ₀, P ₁, P ₂... P _N-1The η of operating point _{The learning value correction}Value, the load value that each operating point is corresponding is respectively L ₀, L ₁, L ₂... L _N-1, the mean value of every adjacent two load values is operating mode area limit line, i.e. a L ₀₁=(L ₀+ L ₁)/2, L ₀₂=(L ₁+ L ₂)/2....... tries to achieve N-1 bar operating mode area limit line by that analogy, then, with 0 to L ₀₁Between be divided into operating mode zone, i.e. a G ₀₁L ₀₁To L ₀₂Between be divided into operating mode zone, i.e. a G ₀₂... by that analogy, open loop situations is divided into N operating mode zone.

4. the controlling method of described motorcycle engine electric spray system open loop situations air fuel ratio according to claim 1 is characterized in that: adopt η _{The learning value correction}Value is adjusted the fuel injection quantity of motorcycle when open loop situations is moved, and comprises, with operating point P ₀, P ₁, P ₂... P _{N- 1}η _{The learning value correction}Value and operating mode zone G ₀₁, G ₀₂... G _0NCorresponding one by one, the η in this operating mode zone of Automatically invoked when motor enters a certain operating mode area operation of open loop situations _{The learning value correction}Value is revised fuel injection quantity, at this moment, and the total fuel injection quantity Q of motor _AlwaysCalculated by following formula:

Q _Always=Q _{Substantially}* η _{Transient state}* η _{1/ λ}* η _{O2 revises}* η _{The learning value correction}

Wherein:

Q _{Substantially}That motor is at the basic fuel injection amount according to air inflow and chemically correct fuel calculating of this operating point;

η _{Transient state}Being fuel injection quantity transient state correction factor, is that manipulation factor according to the driver causes when engine transient changes the correction to Engine Injection Mass, η when engine steady state is moved _{Transient state}Coefficient is 1;

η _{1/ λ}The target air-fuel ratio correction factor, at closed loop operating mode zone η _{1/ λ}Coefficient is 1, at open loop operating mode zone η _{1/ λ}Coefficient value is 1.1～1.15;

η _{O2 revises}Being the Closed-cycle correction coefficient, is mean engine when operating in the closed loop control state, the correction value of the real-time fuel injection quantity that calculates according to the feedback signal of lambda sensor; η when the closed loop state _{O2 revises}Coefficient changes η when open loop situations near 1 _{O2 revises}Coefficient is 1;

η _{The learning value correction}Being fuel injection quantity study correction factor, is that the current motor of expression and electric injection system are in a certain operating mode zone and the motor of the state of demarcation and the correction value of the difference between the electric injection system.

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