CN110501100A - A kind of motor torque detection method based on ignition discharge ionization signal - Google Patents
A kind of motor torque detection method based on ignition discharge ionization signal Download PDFInfo
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- CN110501100A CN110501100A CN201910896631.9A CN201910896631A CN110501100A CN 110501100 A CN110501100 A CN 110501100A CN 201910896631 A CN201910896631 A CN 201910896631A CN 110501100 A CN110501100 A CN 110501100A
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- operating condition
- motor torque
- electric discharge
- discharge ionization
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
Abstract
The invention discloses a kind of motor torque detection methods based on ignition discharge ionization signal, including operate normally engine, read the engine speed under current operating condition；Determine the electric discharge ionization duration of each burn cycle；Determine the electric discharge ionization average duration under current operating condition；Calculate the motor torque under current operating condition；And it is exported the motor torque under current operating condition as motor torque detected value.Motor torque can be stablized using the present invention, accurate detection, while reduce cost.
Description
Technical field
The present invention relates to engine detection fields, and in particular to a kind of motor torque based on ignition discharge ionization signal
Detection method.
Background technique
The operating condition of vehicle operating condition and engine is closely related, dynamic property, economy and the emission performance of vehicle
Directly influenced by engine operation condition, at the same engine operating condition information be also transmission control main input parameter it
One.In usual development process, after engine completes calibration on rack, carries vehicle and be merely able to directly survey its revolving speed
Amount, but the reality output torque of engine can be only calculated by the torque model of control unit, the difference with true value
It is different directly to be influenced by the stated accuracy of torque model.But under vehicle actual operating mode, because there are a large amount of transient conditions,
And as mileage increases, engine condition changes, and the error of torque calculation value and true value has increase, to influence
Speed changer works normally, and causes vehicle performance abnormal.Traditional power automobile is because of power assembly only by engine and speed changer structure
At relatively large for the serious forgiveness of engine torque value judgement.But it for instantly fast-developing hybrid vehicle, moves
Power assembly needs engine, motor to cooperate with output torque to speed changer, this make control unit need to calculate in advance engine with
The power output demand percentage of motor, and target torque is issued to engine and motor respectively.Therefore, in hybrid vehicle
In, motor torque judges that precision not only affects transmission duty, can also impact to motor and cell operating status.By
Increase in coverage, the serious forgiveness of motor torque judgement declines to a great extent, and just the demand higher precision on vehicle is started for this
Machine Torque test.
Currently, engine output torque can also pass through torque sensor other than the torque model of control unit of engine
Measurement is measured based on modes such as engine cylinder inner gauge calculations.But torque sensor can not be installed easily on vehicle；And cylinder pressure
Sensor higher cost, it is easy to damage, it is also not susceptible to the batch application on vehicle.
CN103603731A discloses a kind of engine torque estimation method based on ionic current, uses ionic current
The second peak value of signal (i.e. combustion peak) and the indication torque association analysis based on cylinder pressure sensor, thus estimating engine torque
Method.This method has the following problems: (1) in most cases, engine in-cylinder combustion (for chemical reaction) generates
Ion current signal circular wave it is big, the fit correlation of combustion peak and torque is unstable, estimates to influence final torque
Count result；(2) it needs using cylinder pressure sensor, higher cost.
Summary of the invention
The object of the present invention is to provide a kind of motor torque detection methods based on ignition discharge ionization signal, to hair
Motivation torque stablize, is accurately detected, while reducing cost.
Motor torque detection method of the present invention based on ignition discharge ionization signal, comprising:
Step 1: operating normally engine, the engine speed under current operating condition is read；
Step 2: acquiring under current operating condition ion current signal in the cylinder of each burn cycle, and handled, is put with igniting
The electric moment is starting point, extracts the electric discharge ionization duration of each burn cycle；
Step 3: carrying out mean value calculation to the electric discharge ionization duration of the continuous burning circulation of preset quantity, and roll more
Newly, the electric discharge ionization average duration under current operating condition is obtained；
Step 4: the engine speed and electric discharge ionization average duration are substituted into motor torque tables of data, adopt
The motor torque under current operating condition is obtained with interpolation calculation；Wherein, the motor torque tables of data is to demarcate
The engine speed that arrives, the mapping table of electric discharge ionization average duration and motor torque；
Step 5: being exported the motor torque under current operating condition as motor torque detected value.
Preferably, the motor torque tables of data is demarcated as follows obtains:
The first step runs engine according to some operating condition in universal characteristic operating condition, acquires the work
Engine speed, motor torque under condition and ion current signal in the cylinder of each burn cycle, then execute second step；
Second step, the ignition discharge moment for judging ion current signal in the cylinder of each burn cycle under the operating condition with from ignition coil
On the time of ignition that measures it is whether completely corresponding, if it is, executing third step, otherwise terminate this calibration；
Third step judges whether the voltage value of ion current signal in the cylinder of each burn cycle under the operating condition is attained by sampling system
Otherwise unified test amount voltage max executes the 4th step if it is, executing the 5th step；
4th step, the dividing ratios for adjusting ionic current detection circuit in cylinder, then return and execute the first step；
5th step runs engine according to the remaining operating condition in universal characteristic operating condition, acquires remaining work
Then engine speed, motor torque under condition and ion current signal in the cylinder of each burn cycle execute the 6th step；
6th step handles ion current signal in the cylinder of each burn cycle under each operating condition, is with the ignition discharge moment
Starting point extracts the electric discharge ionization duration of each burn cycle under each operating condition, then executes the 7th step；
The electric discharge ionization duration of burn cycle each under same operating is carried out mean value calculation by the 7th step, obtains the operating condition
Under electric discharge ionize average duration, then execute the 8th step；
8th step repeats the 7th step, until all operating conditions in Engine Universal Characteristics operating condition have been surveyed, obtains under each operating condition
Electric discharge ionize average duration, then execute the 9th step；
9th step, the engine speed by under each operating condition, motor torque, electric discharge ionization average duration are corresponding, go forward side by side
Row matrixization processing, obtains the motor torque tables of data.
Preferably, in the step of calibration obtains motor torque tables of data, engine speed range at least covers 1000
For r/min to rated power revolving speed, engine torque range at least covers idling operation torque to external characteristics operating condition torque, Ge Gegong
Burn cycle number >=50 under condition.
Preferably, the electric discharge ionization duration is that the voltage value of ion current signal in cylinder reaches sampling system measurement
Voltage max and the time maintained.
Preferably, the electric discharge ionization duration obtains in the following way:
Determine crank angle corresponding when the voltage value of ion current signal in cylinder reaches sampling system measurement voltage max
α1Corresponding crankshaft turns when reducing since sampling system measures voltage max with the voltage value of ion current signal in cylinder
Angle α2；
By α2With α1Subtract each other, obtain crank angle variable quantity △ α, crank angle variable quantity △ α is converted into the time using revolving speed,
Using the time as the electric discharge ionization duration (crank angle variable quantity △ α is divided by with revolving speed, and is converted, is obtained
To time be the electric discharge ionization duration).
The present invention has the effect that
(1) sensor compared with the method based on torque sensor and cylinder pressure sensor measurement motor torque, in the present invention
For product spark plug, it is easier to be installed on vehicle, application cost is lower.
(2) with based on the second peak value of ion current signal (i.e. combustion peak) carry out motor torque estimation method phase
Than the present invention is made based on ion current signal in the cylinder that the ionization of ignition discharge stage generates with the electric discharge ionization duration
For reference variable, and the ionization duration of discharging is influenced by aeration quantity in the cylinder under different operating conditions, predominantly physical action,
Compared with the chemical action of burning, circular wave rate is lower, and motor torque detection stability, accuracy are higher；And the present invention
It does not need by cylinder pressure sensor, cost is lower.
(3) present invention can be not only used for offline motor torque detection, it can also be used to which engine carries the online torque inspection of vehicle
It surveys.
(4) Torque test form of the present invention, easy to operate, the control parameter with present engine control unit
Setting mode of tabling look-up is similar, can quickly apply in the product, reduce additional customized development amount, application efficiency is higher.
Detailed description of the invention
Fig. 1 is the overhaul flow chart of the present embodiment.
Fig. 2 is the demarcation flow figure of motor torque tables of data in the present embodiment.
Fig. 3 is ion current signal schematic diagram in the cylinder of engine employed in the present embodiment.
Fig. 4 is the contour relationship that engine speed-electric discharge ionizes average duration-motor torque in the present embodiment
Schematic diagram.
Specific embodiment
Before carrying out motor torque detection, need advanced rower fixed, to obtain motor torque tables of data, engine turns
Square tables of data is the mapping table of engine speed obtained by calibrating, electric discharge ionization average duration and motor torque.
As shown in Figure 2 and Figure 3, motor torque tables of data demarcates obtain as follows:
The first step runs engine according to some operating condition in universal characteristic operating condition, acquires the work
In the cylinder of engine speed, motor torque and each burn cycle (value in the present embodiment is 50 burn cycles) under condition
Then ion current signal executes second step；
Second step, judge in the cylinder of lower 50 burn cycles of the operating condition ignition discharge moment of ion current signal with from ignition lead
Whether the time of ignition measured on circle is completely corresponding, if it is, executing third step, otherwise terminates this calibration；
Third step judges whether the voltage value of ion current signal in the cylinder of lower 50 burn cycles of the operating condition is attained by sampling
Systematic survey voltage max (value is 5V in the present embodiment), if it is, executing the 5th step, otherwise executes the 4th step；
4th step, the dividing ratios for adjusting ionic current detection circuit in cylinder, then return and execute the first step, until under the operating condition
The voltage value of ion current signal is attained by 5V in the cylinder of 50 burn cycles；
5th step runs engine according to the remaining operating condition in universal characteristic operating condition, acquires remaining work
Then engine speed, motor torque under condition and ion current signal in the cylinder of 50 burn cycles execute the 6th step；
6th step, 50 burn cycles lower to each operating condition cylinder in ion current signal handle, with the ignition discharge moment
For starting point, the electric discharge ionization duration of lower 50 burn cycles of each operating condition is extracted, the 7th step is then executed；Wherein, it discharges
The ionization duration is the time that the voltage value of ion current signal in cylinder reaches 5V and maintains, and is obtained in the following way: first
First, crank angle α corresponding when the voltage value of ion current signal in cylinder reaches 5V is determined1(i.e. the ignition discharge moment, institute was right
The crank angle α answered1) and cylinder in the voltage value of ion current signal crank angle α corresponding when reducing since 5V2；Its
It is secondary, by α2With α1Subtract each other, obtain crank angle variable quantity △ α, crank angle variable quantity △ α is converted into the time using revolving speed, it will
The time as electric discharge ionization the duration (crank angle variable quantity △ α is divided by with revolving speed, and is converted, obtain when
Between be electric discharge ionization the duration)；
The electric discharge ionization duration of lower 50 burn cycles of same operating is carried out mean value calculation by the 7th step, obtains the work
Electric discharge under condition ionizes average duration, then executes the 8th step；
8th step repeats the 7th step, until all operating conditions in Engine Universal Characteristics operating condition have been surveyed, obtains under each operating condition
Electric discharge ionize average duration, then execute the 9th step；
9th step, the engine speed by under each operating condition, motor torque, electric discharge ionization average duration are corresponding, go forward side by side
Row matrixization processing, obtains motor torque tables of data.Wherein, X variable is engine speed, and Y variable is that electric discharge ionization is average
Duration, Z variable are motor torque.Some type shown in Fig. 4 can be obtained using the data in motor torque tables of data
Number the corresponding three-dimensional system of coordinate contour map of engine, motor torque variable gradient and engine speed, electric discharge ionization are flat
There is obvious monotone variation relationship in the equal duration.
Motor torque detection method based on ignition discharge ionization signal as shown in Figure 1, comprising:
Step 1: operating normally engine, engine speed (hair under current operating condition is read from control unit of engine
Motivation revolving speed is also possible to engine speed sensor revolving speed measured directly).
Step 2: determining that the electric discharge of each burn cycle ionizes the duration: acquiring each burn cycle under current operating condition
Cylinder in ion current signal, and handled, using the ignition discharge moment as starting point, the electric discharge ionization for extracting each burn cycle is held
The continuous time.The electric discharge ionization duration is the time that the voltage value of ion current signal in cylinder reaches 5V and maintains, and is obtained
Mode is identical as the electric discharge ionization acquisition modes of duration described in aforementioned 6th step.
Step 3: determining that the electric discharge under current operating condition ionizes average duration: to the continuous burning of preset quantity
The electric discharge of circulation (value is 15 continuous burning circulations in the present embodiment) ionizes duration progress mean value calculation, and rolls
It updates, obtains the electric discharge ionization average duration under current operating condition.
Step 4: calculating the motor torque under current operating condition: aforementioned engine speed and aforementioned electric discharge are ionized
Average duration substitutes into aforementioned motor torque tables of data, is obtained under current operating condition using arest neighbors interpolation calculation
Motor torque.
Step 5: being exported the motor torque under current operating condition as motor torque detected value.
Claims (5)
1. a kind of motor torque detection method based on ignition discharge ionization signal characterized by comprising
Step 1: operating normally engine, the engine speed under current operating condition is read；
Step 2: acquiring under current operating condition ion current signal in the cylinder of each burn cycle, and handled, is put with igniting
The electric moment is starting point, extracts the electric discharge ionization duration of each burn cycle；
Step 3: carrying out mean value calculation to the electric discharge ionization duration of the continuous burning circulation of preset quantity, and roll more
Newly, the electric discharge ionization average duration under current operating condition is obtained；
Step 4: the engine speed and electric discharge ionization average duration are substituted into motor torque tables of data, adopt
The motor torque under current operating condition is obtained with interpolation calculation；Wherein, the motor torque tables of data is to demarcate
The engine speed that arrives, the mapping table of electric discharge ionization average duration and motor torque；
Step 5: being exported the motor torque under current operating condition as motor torque detected value.
2. the motor torque detection method according to claim 1 based on ignition signal, which is characterized in that described to start
Machine torque data table is demarcated as follows to be obtained:
The first step runs engine according to some operating condition in universal characteristic operating condition, acquires the work
Engine speed, motor torque under condition and ion current signal in the cylinder of each burn cycle, then execute second step；
Second step, the ignition discharge moment for judging ion current signal in the cylinder of each burn cycle under the operating condition with from ignition coil
On the time of ignition that measures it is whether completely corresponding, if it is, executing third step, otherwise terminate this calibration；
Third step judges whether the voltage value of ion current signal in the cylinder of each burn cycle under the operating condition is attained by sampling system
Otherwise unified test amount voltage max executes the 4th step if it is, executing the 5th step；
4th step, the dividing ratios for adjusting ionic current detection circuit in cylinder, then return and execute the first step；
5th step runs engine according to the remaining operating condition in universal characteristic operating condition, acquires remaining work
Then engine speed, motor torque under condition and ion current signal in the cylinder of each burn cycle execute the 6th step；
6th step handles ion current signal in the cylinder of each burn cycle under each operating condition, is with the ignition discharge moment
Starting point extracts the electric discharge ionization duration of each burn cycle under each operating condition, then executes the 7th step；
The electric discharge ionization duration of burn cycle each under same operating is carried out mean value calculation by the 7th step, obtains the operating condition
Under electric discharge ionize average duration, then execute the 8th step；
8th step repeats the 7th step, until all operating conditions in Engine Universal Characteristics operating condition have been surveyed, obtains under each operating condition
Electric discharge ionize average duration, then execute the 9th step；
9th step, the engine speed by under each operating condition, motor torque, electric discharge ionization average duration are corresponding, go forward side by side
Row matrixization processing, obtains the motor torque tables of data.
3. the motor torque detection method according to claim 2 based on ignition discharge ionization signal, it is characterised in that:
In the step of calibration obtains motor torque tables of data, engine speed range at least covers 1000 r/min to rated power
Revolving speed, the burn cycle that engine torque range at least covers idling operation torque to external characteristics operating condition torque, under each operating condition
Number >=50.
4. the motor torque detection method according to claim 1 or 2 or 3 based on ignition discharge ionization signal, special
Sign is: the electric discharge ionization duration is that the voltage value of ion current signal in cylinder reaches sampling system measurement voltage maximum
The time for being worth and maintaining.
5. the motor torque detection method according to claim 4 based on ignition discharge ionization signal, which is characterized in that
The electric discharge ionization duration obtains in the following way:
Determine crank angle α corresponding when the voltage value of ion current signal in cylinder reaches sampling system measurement voltage max1
Corresponding crank angle when reducing since sampling system measures voltage max with the voltage value of ion current signal in cylinder
α2；
By α2With α1Subtract each other, obtain crank angle variable quantity △ α, crank angle variable quantity △ α is converted into the time using revolving speed,
The duration is ionized using the time as the electric discharge.
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Cited By (1)
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| CN114942098A (en) * | 2022-04-29 | 2022-08-26 | 重庆长安汽车股份有限公司 | Method for measuring maximum wheel side power of automatic transmission automobile |
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