CN104747288A - Engine indicating torque estimating method and engine indicating torque circulating circuit - Google Patents
Engine indicating torque estimating method and engine indicating torque circulating circuit Download PDFInfo
- Publication number
- CN104747288A CN104747288A CN201310732386.0A CN201310732386A CN104747288A CN 104747288 A CN104747288 A CN 104747288A CN 201310732386 A CN201310732386 A CN 201310732386A CN 104747288 A CN104747288 A CN 104747288A
- Authority
- CN
- China
- Prior art keywords
- mrow
- engine
- multiplier
- mover
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 51
- 230000001133 acceleration Effects 0.000 claims abstract description 34
- 238000002347 injection Methods 0.000 claims abstract description 15
- 239000007924 injection Substances 0.000 claims abstract description 15
- 238000004364 calculation method Methods 0.000 claims description 23
- 239000000446 fuel Substances 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000002485 combustion reaction Methods 0.000 description 6
- 238000003745 diagnosis Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000007906 compression Methods 0.000 description 2
- 230000002000 scavenging effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Landscapes
- Control Of Electric Motors In General (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses an engine indicating torque estimating method. The method comprises the steps of calculating the instantaneous rotation speed of an engine according to a signal of a crankshaft position sensor; collecting time slices of each tooth of the crankshaft position sensor, recoding the time slices during an acting process and storing a time slice array; utilizing the currently stored time slice array to calculate the current rotation speed acceleration; according to the current fuel-injection quantity Q of the engine, the current rotation speed acceleration and the current instantaneous rotation speed of the engine, calculating and outputting the engine indicating torque TInd. The invention discloses an engine indicating torque calculating circuit. According to the invention, the engine indicating torque can be calculated and output by utilizing the crankshaft position sensor and introducing the concept of rotation speed acceleration based on tooth time slices. Therefore, the indicating torque of the engine can be precisely estimated in real time.
Description
Technical Field
The present invention relates to engine technologies, and in particular, to an engine indicated torque (combustion indication) estimation method and an engine indicated torque calculation circuit.
Background
The real-time estimation of the indicated torque of the engine has very important significance on the aspects of closed-loop control of a traditional engine power assembly, online diagnosis of the engine and the like. At present, various algorithms have been proposed for online estimation of indicated torque of an engine at home and abroad, and the algorithms mainly comprise a cylinder pressure estimation method and a crankshaft rotation speed fluctuation estimation method. However, both of these algorithms have their limitations: with the cylinder pressure estimation method, it is difficult to directly mount the cylinder pressure sensor on the engine to perform control or diagnosis tasks due to the high cost and poor durability of the cylinder pressure sensor and the limitation of the installation space of the engine; a crankshaft rotation speed fluctuation estimation method is adopted, the cylinder pressure and the indicated torque are estimated by utilizing the crankshaft position, the used crankshaft position sensor is low in price, simple to install and good in stability, but in the working process of an engine, the instantaneous rotation speed regularly fluctuates and faces to the complexity of a model, the calculation capability of an Engine Control Unit (ECU) is considered, the online real-time estimation is not suitable, and the transient error is brought.
Disclosure of Invention
The invention aims to solve the technical problem that the indicated torque of an engine can be accurately estimated in real time.
In order to solve the above technical problem, the present invention provides an engine indicated torque estimation method, comprising the steps of:
calculating the instantaneous rotating speed of the engine according to the signal of the crankshaft position sensor;
acquiring time slices of each tooth of the crankshaft position sensor according to signals of the crankshaft position sensor, recording n time slices in the working process, taking m time slices as storage data, and storing a time slice array with the length of f, wherein f = n/m;
thirdly, calculating the current rotating speed and acceleration by using the currently stored time slice arrayThe specific algorithm is as follows:
wherein,is the current instantaneous speed of the engine,for the current rotational speed acceleration, Tf-1]X-1For the last element of the time slice array of the last work process, Ti]The method comprises the steps that the ith element is an ith element of a time slice array in the current working process, Ci is an ith fitting coefficient, i is an integer which is greater than or equal to 0 and less than or equal to f-1, and Ctrans is a unit conversion constant;
fourthly, according to the fuel injection quantity Q of the current engine and the current rotating speed accelerationCurrent instantaneous speed of engineCalculating and outputting indicated engine torque TInd:
f (Q) is a load factor function taking the oil injection quantity Q of the current engine as a variable,to be based on the current instantaneous speed of the engineIs a function of the variable speed factor and Cm is a coefficient.
Preferably, in the second step, the crankshaft position sensor adopts a crankshaft position signal disc with 58 teeth plus 2 missing teeth to collect crankshaft position signals of the four-stroke engine, the number of time slices in the working process is 30, each time slice with 5 teeth is used as storage data T, and a time slice array with the length of 6 is stored;
in the third step, the current rotating speed and acceleration are calculated by using the currently stored time slice arrayThe specific algorithm is as follows:
in order to solve the technical problem, the engine indicated torque calculation circuit provided by the invention comprises a rotating speed acceleration calculation module, a small taking module, a load factor calculation module, a rotating speed factor calculation module, a first multiplier, a second multiplier, a third multiplier, a fourth multiplier, an adder, a first upper limit limiting unit, a first lower limit limiting unit, a second upper limit limiting unit and a third upper limit limiting unit;
the small-taking module outputs a smaller value of the two inputs;
the first upper and lower limit limiting unit, the second upper and lower limit limiting unit and the third upper and lower limit limiting unit output a lower limit value when the input is less than the lower limit, output an upper limit value when the input is greater than the upper limit, and output an input value when the input is between the upper limit and the lower limit;
the first multiplier, the second multiplier, the third multiplier and the fourth multiplier output results obtained by multiplying input values of all input ends;
the adder outputs the result of adding the input values of the input ends;
the load factor calculation module is used for calculating the current engine load according to the fuel injection quantity of the current engine through a calibrated fuel injection quantity/load curve and outputting the current engine load to the second input end of the fourth multiplier;
the rotating speed factor calculating module is used for calculating and outputting the current basic torque of the engine through a calibrated rotating speed/torque curve according to the current instantaneous rotating speed of the engine and outputting the current basic torque to the second input end of the adder;
the rotating speed acceleration calculating module is used for calculating the current rotating speed acceleration by using the currently stored time slice array and outputting the current rotating speed acceleration to the first input end of the first multiplier, and the specific algorithm of the current rotating speed acceleration is as follows:
wherein,for the current rotational speed acceleration, the rotational speed acceleration,is the current instantaneous speed of the engine, Tf-1]X-1For the last element of the time slice array of the last work process, Ti]The method comprises the steps that the ith element is an ith element of a time slice array in the current working process, Ci is an ith fitting coefficient, i is an integer which is greater than or equal to 0 and less than or equal to f-1, and Ctrans is a unit conversion constant;
the small-taking module is used for inputting the current instantaneous rotating speed of the engine at a first input end, inputting a set rotating speed at a second input end and outputting a signal to the second input end of the first multiplier and the second input end of the second multiplier;
the output end of the first multiplier is connected with the input end of the first upper and lower limit limiting unit;
the output end of the first upper and lower limit limiting unit is connected with the first input end of the second multiplier;
the output end of the second multiplier is connected with the input end of the second upper and lower limit limiting unit;
the output end of the second upper and lower limit limiting unit is connected with the first input end of the third multiplier;
the second input end of the third multiplier inputs a coefficient, and the output end of the third multiplier is connected with the first input end of the fourth multiplier;
the output end of the fourth multiplier is connected with the first input end of the adder;
the output end of the adder is connected with the input end of the third upper and lower limit limiting unit;
and the output end of the third upper and lower limit limiting unit is used for outputting the indicated torque of the engine.
The engine indicated torque estimation method and the engine indicated torque calculation circuit utilize the crankshaft position sensor, introduce a rotating speed acceleration concept based on the tooth time slice, calculate and output the engine indicated torque (combustion indication), have simple implementation circuit structure, can accurately estimate the indicated torque of the engine in real time, reflect the combustion condition of the current cycle in real time, provide good basis for the next correction, and can be applied to the closed-loop control and the online diagnosis of the engine.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the present invention are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of one embodiment of an indicated torque estimation method of an engine of the present invention;
FIG. 2 is a schematic diagram of the time slice acquisition, recording and calculation of the indicated torque estimation method of the engine according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of an embodiment of an engine indicated torque calculation circuit of the present invention.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
An engine indicated torque estimation method, as shown in FIG. 1, comprising the steps of:
calculating the instantaneous rotating speed of the engine according to the signal of the crankshaft position sensor;
whether the two-stroke engine or the four-stroke engine is adopted, one working cycle can be completed only through four working processes of air intake (scavenging), compression, combustion expansion (doing work) and exhaust. In contrast, in a four-stroke engine, the piston reciprocates twice for every two revolutions (720 degrees) of the crankshaft, and the engine completes one working cycle, i.e., one working cycle for every four strokes. In a two-stroke engine, the piston reciprocates once per rotation (360 degrees) of the crankshaft, and the engine completes one cycle, i.e., one cycle per two strokes. The two-stroke engine and the four-stroke engine only open and close the intake valve and the exhaust valve or the intake valve, the exhaust valve and the scavenging port once per working cycle, but the opening and closing time periods are different.
From the signal of the crankshaft position sensor, the instantaneous rotational speed of the engine can be calculated. During the working process of the engine, the instantaneous rotating speed has regular fluctuation, when the power application process is terminated, the instantaneous rotating speed reaches the highest point, and when the compression process is terminated, the instantaneous rotating speed reaches the lowest point.
Acquiring time slices of each tooth of the crankshaft position sensor through an enhanced timing unit (eTPU) according to signals of the crankshaft position sensor, recording n time slices in the working process, taking m time slices as storage data, storing a time slice array with the length of f, wherein f = n/m, and n, m and f are positive integers;
thirdly, calculating the current rotating speed and acceleration by using the currently stored time slice arrayThe specific algorithm is as follows:
wherein,is the current instantaneous speed of the engine,for the current rotational speed acceleration, Tf-1]X-1For the last element of the time slice array of the last work process, Ti]The method comprises the steps that the ith element is an ith element of a time slice array in the current working process, Ci is an ith fitting coefficient, i is an integer which is greater than or equal to 0 and less than or equal to f-1, and Ctrans is a unit conversion constant;
fourthly, according to the fuel injection quantity Q of the current engine and the current rotating speed accelerationCurrent instantaneous speed of engineCalculating and outputting indicated engine torque TInd:
f (Q) is a load factor function taking the oil injection quantity Q of the current engine as a variable,to be based on the current instantaneous speed of the engineIs a function of the variable speed factor and Cm is a coefficient.
The method for estimating the indicated torque of the engine utilizes the crankshaft position sensor, introduces the concept of rotating speed acceleration based on the tooth time slice, calculates and outputs the indicated torque (combustion indication) of the engine, can accurately estimate the indicated torque of the engine in real time, reflects the combustion condition of the current cycle in real time, provides good basis for the next correction, and can be applied to the closed-loop control and the online diagnosis of the engine.
Assuming the crankshaft as a rigid shaft, the torque balance equation for the engine is:
T in formula (1)IndTo indicate torque, TFricTo friction torque, TLoadJ (theta) is a rotational variable, theta is a crank angle,in order to be the rotational speed,is the rotational speed acceleration.
The formula for calculating the indicated torque of the engine can be obtained from the formula (1):
the current fuel injection quantity Q of the engine can reflect the current load, f (Q) is a load factor function taking the current fuel injection quantity Q of the engine as a variable,to be based on the current instantaneous speed of the engineIs a function of the variable speed factor and Cm is a coefficient.
Example two
The time slice acquisition and recording need to select the working process of the engine, and the indicated torque calculation needs to be completed in the current working process and the next working process is completed before. In the second step of the method for estimating indicated torque of the engine according to the first embodiment, the crankshaft position sensor acquires crankshaft position signals of the four-stroke engine by using a crankshaft position signal disc with 58 teeth plus 2 missing teeth, 30 time slices in the power application process are provided, each time slice with 5 teeth is used as storage data T, a time slice array with the length of 6 is stored, and the specific acquisition and recording time is shown in fig. 2. In the third step, the current rotating speed and acceleration are calculated by using the currently stored time slice arrayThe specific algorithm is as follows:
EXAMPLE III
An engine indicated torque calculation circuit for implementing the engine indicated torque estimation method according to the first embodiment, as shown in fig. 3, includes a rotational speed acceleration calculation module, a small-taking module, a load factor calculation module, a rotational speed factor calculation module, a first multiplier, a second multiplier, a third multiplier, a fourth multiplier, an adder, a first upper and lower limit limiting unit, a second upper and lower limit limiting unit, and a third upper and lower limit limiting unit;
the small-taking module outputs a smaller value of the two inputs;
the first upper and lower limit limiting unit, the second upper and lower limit limiting unit and the third upper and lower limit limiting unit output a lower limit value when the input is less than the lower limit, output an upper limit value when the input is greater than the upper limit, and output an input value when the input is between the upper limit and the lower limit;
the first multiplier, the second multiplier, the third multiplier and the fourth multiplier output results obtained by multiplying input values of all input ends;
the adder outputs the result of adding the input values of the input ends;
the load factor calculation module is used for calculating and outputting the current engine load according to the fuel injection quantity Q of the current engine through a calibrated fuel injection quantity/load curve and outputting the current engine load to the second input end of the fourth multiplier;
the rotating speed factor calculating module is used for calculating the current instantaneous rotating speed of the engineCalculating and outputting the current basic torque of the engine through a calibrated rotating speed/torque curve, and outputting the current basic torque of the engine to a second input end of the adder;
the rotating speed acceleration calculating module is used for calculating the current rotating speed acceleration by using the currently stored time slice arrayThe current rotating speed and acceleration are output to a first input end of a first multiplierThe specific algorithm is as follows:
wherein,for the current rotational speed acceleration, the rotational speed acceleration,is the current instantaneous speed of the engine, Tf-1]X-1For the last element of the time slice array of the last work process, Ti]The method comprises the steps that the ith element is an ith element of a time slice array in the current working process, Ci is an ith fitting coefficient, i is an integer which is greater than or equal to 0 and less than or equal to f-1, and Ctrans is a unit conversion constant;
the small fetching partModule, the first input end inputs the current instantaneous speed of the engineThe second input end inputs the set rotating speed, and the output end is connected with the second input end of the first multiplier and the second input end of the second multiplier;
the output end of the first multiplier is connected with the input end of the first upper and lower limit limiting unit;
the output end of the first upper and lower limit limiting unit is connected with the first input end of the second multiplier;
the output end of the second multiplier is connected with the input end of the second upper and lower limit limiting unit;
the output end of the second upper and lower limit limiting unit is connected with the first input end of the third multiplier;
the second input end of the third multiplier inputs a coefficient Cm, and the output end of the third multiplier is connected with the first input end of the fourth multiplier;
the output end of the fourth multiplier is connected with the first input end of the adder;
the output end of the adder is connected with the input end of the third upper and lower limit limiting unit;
and the output end of the third upper and lower limit limiting unit is used for outputting the indicated torque of the engine.
The third engine indication torque calculation circuit of the embodiment has a simple structure.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (3)
1. An engine indicated torque estimation method, comprising the steps of:
calculating the instantaneous rotating speed of the engine according to the signal of the crankshaft position sensor;
acquiring time slices of each tooth of the crankshaft position sensor according to signals of the crankshaft position sensor, recording n time slices in the working process, taking m time slices as storage data, and storing a time slice array with the length of f, wherein f = n/m;
thirdly, calculating by using the currently stored time slice arrayCurrent rotational speed accelerationThe specific algorithm is as follows:
wherein,is the current instantaneous speed of the engine,for the current rotational speed acceleration, Tf-1]X-1To make for the last oneThe last element of the time slice array of the work process, Ti]The method comprises the steps that the ith element is an ith element of a time slice array in the current working process, Ci is an ith fitting coefficient, i is an integer which is greater than or equal to 0 and less than or equal to f-1, and Ctrans is a unit conversion constant;
fourthly, according to the fuel injection quantity Q of the current engine and the current rotating speed accelerationCurrent instantaneous speed of engineCalculating and outputting indicated engine torque TInd:
f (Q) is a load factor function taking the oil injection quantity Q of the current engine as a variable,to be based on the current instantaneous speed of the engineIs a function of the variable speed factor and Cm is a coefficient.
2. The engine indicated torque estimation method according to claim 1,
in the second step, the crankshaft position sensor adopts a crankshaft position signal disc with 58 teeth plus 2 missing teeth to collect crankshaft position signals of the four-stroke engine, 30 time slices are used in the working process, each time slice with 5 teeth is used as storage data T, and a time slice array with the length of 6 is stored;
in the third step, the current rotating speed and acceleration are calculated by using the currently stored time slice arrayThe specific algorithm is as follows:
3. an engine indicated torque calculation circuit is characterized by comprising a rotating speed acceleration calculation module, a small acquisition module, a load factor calculation module, a rotating speed factor calculation module, a first multiplier, a second multiplier, a third multiplier, a fourth multiplier, an adder, a first upper limit and lower limit limiting unit, a second upper limit and lower limit limiting unit and a third upper limit and lower limit limiting unit;
the small-taking module outputs a smaller value of the two inputs;
the first upper and lower limit limiting unit, the second upper and lower limit limiting unit and the third upper and lower limit limiting unit output a lower limit value when the input is less than the lower limit, output an upper limit value when the input is greater than the upper limit, and output an input value when the input is between the upper limit and the lower limit;
the first multiplier, the second multiplier, the third multiplier and the fourth multiplier output results obtained by multiplying input values of all input ends;
the adder outputs the result of adding the input values of the input ends;
the load factor calculation module is used for calculating the current engine load according to the fuel injection quantity of the current engine through a calibrated fuel injection quantity/load curve and outputting the current engine load to the second input end of the fourth multiplier;
the rotating speed factor calculating module is used for calculating and outputting the current basic torque of the engine through a calibrated rotating speed/torque curve according to the current instantaneous rotating speed of the engine and outputting the current basic torque to the second input end of the adder;
the rotating speed acceleration calculating module is used for calculating the current rotating speed acceleration by using the currently stored time slice array and outputting the current rotating speed acceleration to the first input end of the first multiplier, and the specific algorithm of the current rotating speed acceleration is as follows:
wherein,for the current rotational speed acceleration, the rotational speed acceleration,is the current instantaneous speed of the engine, Tf-1]X-1For the last element of the time slice array of the last work process, Ti]The method comprises the steps that the ith element is an ith element of a time slice array in the current working process, Ci is an ith fitting coefficient, i is an integer which is greater than or equal to 0 and less than or equal to f-1, and Ctrans is a unit conversion constant;
the small-taking module is used for inputting the current instantaneous rotating speed of the engine at a first input end, inputting a set rotating speed at a second input end and outputting a signal to the second input end of the first multiplier and the second input end of the second multiplier;
the output end of the first multiplier is connected with the input end of the first upper and lower limit limiting unit;
the output end of the first upper and lower limit limiting unit is connected with the first input end of the second multiplier;
the output end of the second multiplier is connected with the input end of the second upper and lower limit limiting unit;
the output end of the second upper and lower limit limiting unit is connected with the first input end of the third multiplier;
the second input end of the third multiplier inputs a coefficient, and the output end of the third multiplier is connected with the first input end of the fourth multiplier;
the output end of the fourth multiplier is connected with the first input end of the adder;
the output end of the adder is connected with the input end of the third upper and lower limit limiting unit;
and the output end of the third upper and lower limit limiting unit is used for outputting the indicated torque of the engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310732386.0A CN104747288B (en) | 2013-12-26 | 2013-12-26 | Engine indication torque evaluation method and engine indication torque counting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310732386.0A CN104747288B (en) | 2013-12-26 | 2013-12-26 | Engine indication torque evaluation method and engine indication torque counting circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104747288A true CN104747288A (en) | 2015-07-01 |
| CN104747288B CN104747288B (en) | 2018-05-04 |
Family
ID=53587458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310732386.0A Expired - Fee Related CN104747288B (en) | 2013-12-26 | 2013-12-26 | Engine indication torque evaluation method and engine indication torque counting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104747288B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106647288A (en) * | 2017-02-23 | 2017-05-10 | 重庆邮电大学 | Method for estimating indicating torque of engine based on nonsingular terminal sliding mode observer |
| CN112761788A (en) * | 2021-01-13 | 2021-05-07 | 北京理工大学 | Diesel engine cylinder nonuniformity online detection method based on instantaneous rotation speed |
| WO2023045524A1 (en) * | 2021-09-23 | 2023-03-30 | 宁波吉利罗佑发动机零部件有限公司 | Method and apparatus for predicting torque of engine, and computer storage medium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101074634A (en) * | 2006-05-15 | 2007-11-21 | 陈柏全 | Method for estimating engine crank corner and rotation speed |
| US20120004821A1 (en) * | 2009-03-06 | 2012-01-05 | Toyota Jidosha Kabushiki Kaisha | Torque estimating system for internal combustion engine |
| CN102518521A (en) * | 2011-12-27 | 2012-06-27 | 大连理工大学 | Torque estimation method for vehicle engine |
| CN102828845A (en) * | 2012-09-17 | 2012-12-19 | 潍柴动力股份有限公司 | Rotation speed regulation method, rotation speed regulation device and rotation speed regulation system |
-
2013
- 2013-12-26 CN CN201310732386.0A patent/CN104747288B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101074634A (en) * | 2006-05-15 | 2007-11-21 | 陈柏全 | Method for estimating engine crank corner and rotation speed |
| US20120004821A1 (en) * | 2009-03-06 | 2012-01-05 | Toyota Jidosha Kabushiki Kaisha | Torque estimating system for internal combustion engine |
| CN102518521A (en) * | 2011-12-27 | 2012-06-27 | 大连理工大学 | Torque estimation method for vehicle engine |
| CN102828845A (en) * | 2012-09-17 | 2012-12-19 | 潍柴动力股份有限公司 | Rotation speed regulation method, rotation speed regulation device and rotation speed regulation system |
Non-Patent Citations (1)
| Title |
|---|
| 李琳，张永祥: ""基于瞬时转速Armax模型的柴油机指示扭矩估计方法研究"", 《振动与冲击》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106647288A (en) * | 2017-02-23 | 2017-05-10 | 重庆邮电大学 | Method for estimating indicating torque of engine based on nonsingular terminal sliding mode observer |
| CN106647288B (en) * | 2017-02-23 | 2019-05-31 | 重庆邮电大学 | Engine indication torque estimation method based on non-singular terminal sliding mode observer |
| CN112761788A (en) * | 2021-01-13 | 2021-05-07 | 北京理工大学 | Diesel engine cylinder nonuniformity online detection method based on instantaneous rotation speed |
| CN112761788B (en) * | 2021-01-13 | 2021-11-19 | 北京理工大学 | Diesel engine cylinder nonuniformity online detection method based on instantaneous rotation speed |
| WO2023045524A1 (en) * | 2021-09-23 | 2023-03-30 | 宁波吉利罗佑发动机零部件有限公司 | Method and apparatus for predicting torque of engine, and computer storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104747288B (en) | 2018-05-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101581257B (en) | Angular velocity/angular acceleration calculator, torque estimator, and combustion state estimator | |
| US7946162B2 (en) | Method for estimating the oxygen concentration in internal combustion engines | |
| US7937996B2 (en) | Turbo speed sensor diagnostic for turbocharged engines | |
| US20160003180A1 (en) | System for estimating exhaust manifold temperature | |
| WO2002071308A1 (en) | Engine control using torque estimation | |
| GB2489821A (en) | Estimating fuel consumption of a vehicle | |
| CN102261995A (en) | Engine misfire detection systems and methods using discrete fourier transform approximation | |
| US20130239669A1 (en) | Estimation device for cylinder intake air amount in an internal combustion engine | |
| CN104747288B (en) | Engine indication torque evaluation method and engine indication torque counting circuit | |
| CN110542562B (en) | Engine torque measuring method, engine torque measuring device, engine torque control device, and storage medium | |
| CN102278223A (en) | Apparatus and method for estimating stopped engine crank angle | |
| JP4788640B2 (en) | In-cylinder pressure estimation method and cylinder pressure estimation apparatus for internal combustion engine | |
| JP6254633B2 (en) | Internal combustion engine control device | |
| JP5420489B2 (en) | EGR gas flow rate estimation device for internal combustion engine | |
| KR101792177B1 (en) | Method for estimating a torque generated by an internal combustion engine | |
| CN104179573A (en) | Estimation method for combustion state of sub-cylinder of internal combustion engine | |
| Chen et al. | Estimation of engine rotational dynamics using Kalman filter based on a kinematic model | |
| CN110778434A (en) | Method and device for determining oil injection angle of diesel engine in single camshaft mode | |
| EP2539567B1 (en) | Exhaust pressure estimation in a vehicle | |
| CN105649755B (en) | A kind of method for determining Turbocharged Gasoline Engine scavenging ratio | |
| CN114061962B (en) | Engine state estimation device, engine state estimation method, and storage medium | |
| CN110344960A (en) | A kind of engine speed evaluation method and system | |
| Wang et al. | Cylinder by cylinder indicated torque and combustion feature estimation based on engine instantaneous speed and one cylinder pressure through error similarity analysis | |
| Yoneya et al. | Combustion torque estimation from mass-produced crank angle sensor | |
| Karnik et al. | Scavenging in a turbocharged gasoline engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180504 |