CN109655184A - A kind of test method of engine drag torque - Google Patents
A kind of test method of engine drag torque Download PDFInfo
- Publication number
- CN109655184A CN109655184A CN201811591701.1A CN201811591701A CN109655184A CN 109655184 A CN109655184 A CN 109655184A CN 201811591701 A CN201811591701 A CN 201811591701A CN 109655184 A CN109655184 A CN 109655184A
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- torque
- engine
- acquisition device
- speed
- cylinder pressure
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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
- G01L3/02—Rotary-transmission dynamometers
- G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
- G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Testing Of Engines (AREA)
Abstract
本发明提出一种发动机阻力力矩的测试方法，属于发动机控制领域。该方法首先在发动机气缸中安装气缸压力传感器，在发动机和恒速设备之间的连接轴上安装转矩采集装置和转角采集装置；切断发动机燃油供给系统，使用恒速设备倒拖发动机转动，并记录转矩信号实际测量值、发动机曲轴角度、缸压信号和转速；从静止到发动机最大转速区间上，对转速做N组平均分割，对分割后的转速进行扫描实验，得到转矩理论值关于发动机曲轴角度、缸压信号和转速的一个离散数值表；然后计算由气体压缩产生的阻力转矩；最终得到由摩擦和阻尼产生的阻力转矩。本发明通过精准测量散点扭矩值并建立模型，能够精确计算出扭矩值，为后期控制电机补偿扭矩波动提供可靠的依据。The invention provides a test method for engine resistance torque, which belongs to the field of engine control. The method first installs a cylinder pressure sensor in the engine cylinder, installs a torque acquisition device and a rotation angle acquisition device on the connecting shaft between the engine and the constant speed equipment; cuts off the engine fuel supply system, uses the constant speed equipment to reverse the engine rotation, and Record the actual measured value of the torque signal, the crankshaft angle of the engine, the cylinder pressure signal and the speed; from the standstill to the maximum speed of the engine, the speed is divided into N groups on average, and the divided speed is scanned and tested, and the theoretical torque value is obtained. A discrete numerical table of engine crankshaft angle, cylinder pressure signal and rotational speed; then calculates the resistance torque due to gas compression; finally obtains the resistance torque due to friction and damping. The invention can accurately calculate the torque value by accurately measuring the scattered torque value and establishing a model, and provide a reliable basis for controlling the motor to compensate the torque fluctuation in the later stage.
Description
Technical field
The invention belongs to field of engine control, a kind of test method of engine drag torque especially set out.
Background technique
Automobile engine can generate vibration at work.Engine vibration influences to experience by bus, and causes engine vibration
The reason of be torque output into cyclic swing, to control entire torque ripple it is necessary to detecting the rule entirely fluctuated and foundation
Corresponding model.
In motor torque modeling process, can be related to three aspect, one be power generation, combustion process generate
Torque, one is crank connecting rod power, and one is resistance and damping.
Power is can be calculated by distributive value, the control parameters such as air inflow, crank connecting rod power
It is then that can be come out according to the geometric dimension and quality of engine, inertia calculation with crankshaft dynamic.But resistance and damping,
Since the rubbing surface of engine is numerous, it is difficult to accurately calculate.
Torque is to be obtained by computational reasoning, but resistance therein and damping are difficult to accurately calculate in the prior art, because
For in-cylinder combustion situation is unstable, the accuracy of dividing cylinder inhomogeneities to will affect calculating.
Summary of the invention
The purpose of the present invention is the shortcomings to overcome prior art, propose a kind of test side of engine drag torque
Method.The present invention can accurately calculate torque value by accurately measuring scatterplot torque value and establish corresponding model, be the later period how
It controls motor compensating torque ripple and reliable foundation is provided.
The present invention proposes a kind of test method of engine drag torque, which comprises the following steps:
1) cylinder pressure sensors are installed in the cylinder of engine, in the connecting shaft between engine and constant speed equipment
Torque acquisition device and corner acquisition device are installed respectively；The cylinder pressure sensors are used to acquire the cylinder pressure of engine；Institute
The angular signal of crankshaft of the corner acquisition device for acquiring engine is stated, and obtains the reality of the engine using this signal
When revolving speed；The torque acquisition device includes being set in connecting shaft and the torque rotating acquisition part being oppositely arranged and torque are fixed
Receiving element, the torque rotating acquisition part are rotated with connecting shaft, and the torque fixed reception part is fixed；Wherein, described turn
It is provided with changing sensor on square rotating acquisition part, is converted into torque telecommunications for detecting the torque of connecting shaft, and by the torque
Number output；The torque fixed reception part includes fixing piece circuit board, and the torque rotating acquisition part includes revolving part circuit board,
There is the processing for receiving and processing the torque electric signal on the fixing piece circuit board or the revolving part circuit board
Unit；
2) fuel oil supply system for cutting off engine using constant speed equipment towing astern engine rotation, and records torque acquisition
The engine crank angle θ on dtc signal actual measured value F, corner acquisition device on deviceCAWith rotational speed omega and cylinder
Cylinder on pressure sensor presses signal P；
3) N group is done to rotational speed omega and is averagely divided on maximum engine speed section from static, to the revolving speed after segmentation into
Row scanning experiment, obtains about M=F1(θCA, ω, P) a discrete values table；Wherein M is the hair measured by torque acquisition device
Motivation drag overall torque value；
4) drag torque generated by gas compression is calculated, expression formula is as follows:
Mp=F2(P、θCA)=Ft·r
Wherein, r is throw of crankshaft, and Ft is gas compression power perpendicular to the component on big end radial direction；
5) drag torque by rubbing and damping generation is calculated, expression formula is as follows:
Mf=F1(θCA、ω、P)-F2(P、θCA)。
The features of the present invention and beneficial effect are: the present invention is by accurately measuring scatterplot torque value and establishing corresponding mould
Type, the fluctuation for control torque output provide more accurate reference data.
The present invention provides feedforward for active vibration damping, provides accurate drag measurement, reaction hair for research engine start shutdown
Kinetic parameter variation of the motivation in starting is shut down.
The present invention can control for motor of engine in the future and provide accurate feedback, can be with more precise control engine oil spout
Amount, ignition timing improve engine and control precision, fuel economy, combustion stability.
Detailed description of the invention
Fig. 1 is motor torque sensor unit structural schematic diagram in the present invention.
Specific embodiment
The test method of a kind of engine drag torque proposed by the present invention, in the following with reference to the drawings and specific embodiments into one
Detailed description are as follows for step.
A kind of test method of engine drag torque proposed by the present invention, comprising the following steps:
1) cylinder pressure sensors are installed in the cylinder of engine, in the connecting shaft between engine and constant speed equipment
Torque acquisition device and corner acquisition device are installed respectively；The cylinder pressure sensors are used to acquire the cylinder pressure of engine；Institute
The angular signal of crankshaft of the corner acquisition device for acquiring engine is stated, and obtains the reality of the engine using this signal
When revolving speed；The torque acquisition device includes being set in connecting shaft and the torque rotating acquisition part being oppositely arranged and torque are fixed
Receiving element, the torque rotating acquisition part are rotated with connecting shaft, and the torque fixed reception part is fixed；Wherein, described turn
It is provided with changing sensor on square rotating acquisition part, is converted into torque telecommunications for detecting the torque of connecting shaft, and by the torque
Number output；The torque fixed reception part includes fixing piece circuit board, and the torque rotating acquisition part includes revolving part circuit board,
There is the processing for receiving and processing the torque electric signal on the fixing piece circuit board or the revolving part circuit board
Unit.
Motor torque sensor unit is as shown in Figure 1 in the present invention, wherein torque acquisition device, corner acquisition device
Data acquisition equipment is sent to the signal of cylinder pressure sensors acquisition.
2) fuel oil supply system for cutting off engine using constant speed equipment towing astern engine rotation, and records torque acquisition
The engine crank angle θ on dtc signal actual measured value F, corner acquisition device on deviceCAWith rotational speed omega and cylinder
Cylinder on pressure sensor presses signal P；3) N group is done to rotational speed omega and is averagely divided on maximum engine speed section from static,
Experiment is scanned to the revolving speed after segmentation, is obtained about dtc signal theoretical value M=F1(θCA, ω, P) discrete values
Table；Wherein M is the engine drag overall torque value measured by torque acquisition device；
4) drag torque generated by gas compression is calculated, expression formula is as follows:
Mp=F2(P、θCA)=Ft·r
Wherein, r is throw of crankshaft；Ft is gas compression power perpendicular to the component on big end radial direction；
5) drag torque by rubbing and damping generation is calculated, expression formula is as follows:
Mf=F1(θCA、ω、P)-F2(P、θCA)。
So far, in the full range of speeds, the drag torque by rubbing and damping generation just obtains engine, be one from
Dissipate numerical tabular.This is with single-cylinder engine for example, the engine of other cylinder numbers can lead to according to specific engine parameter
Crank connecting rod power is crossed similarly to calculate.
Claims (1)
1. a kind of test method of engine drag torque, which comprises the following steps:
1) cylinder pressure sensors are installed in the cylinder of engine, in the connecting shaft between engine and constant speed equipment respectively
Torque acquisition device and corner acquisition device are installed；The cylinder pressure sensors are used to acquire the cylinder pressure of engine；Described turn
Angle acquisition device is used to acquire the angular signal of the crankshaft of engine, and obtains turning in real time for the engine using this signal
Speed；The torque acquisition device includes the torque rotating acquisition part and torque fixed reception for being set in connecting shaft and being oppositely arranged
Part, the torque rotating acquisition part are rotated with connecting shaft, and the torque fixed reception part is fixed；Wherein, the torque rotation
Turn to be provided with changing sensor on acquisition part, for detecting the torque of connecting shaft, and it is defeated by the torque to convert torque electric signal
Out；The torque fixed reception part includes fixing piece circuit board, and the torque rotating acquisition part includes revolving part circuit board, described
There is the processing unit for receiving and processing the torque electric signal on fixing piece circuit board or the revolving part circuit board；
2) fuel oil supply system for cutting off engine, using constant speed equipment towing astern engine rotation, and records torque acquisition device
On dtc signal actual measured value F, the engine crank angle θ on corner acquisition deviceCAWith rotational speed omega and cylinder pressure
Cylinder on sensor presses signal P；
3) from static on maximum engine speed section, N group is done to rotational speed omega and is averagely divided, the revolving speed after segmentation is swept
Experiment is retouched, is obtained about M=F1(θCA, ω, P) a discrete values table；Wherein M is the engine measured by torque acquisition device
Drag overall torque value；
4) drag torque generated by gas compression is calculated, expression formula is as follows:
Mp=F2(P、θCA)=Ft·r
Wherein, r is throw of crankshaft, and Ft is gas compression power perpendicular to the component on big end radial direction；
5) drag torque by rubbing and damping generation is calculated, expression formula is as follows:
Mf=F1(θCA、ω、P)-F2(P、θCA)。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811591701.1A CN109655184A (en) | 2018-12-25 | 2018-12-25 | A kind of test method of engine drag torque |
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| CN201811591701.1A CN109655184A (en) | 2018-12-25 | 2018-12-25 | A kind of test method of engine drag torque |
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| CN109655184A true CN109655184A (en) | 2019-04-19 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111396203A (en) * | 2020-03-26 | 2020-07-10 | 扬州翊翔航空科技有限公司 | Auxiliary starting device of micro hybrid system for unmanned aerial vehicle and control method |
| CN114993541A (en) * | 2022-05-27 | 2022-09-02 | 中国第一汽车股份有限公司 | Method and system for testing starting static friction torque of 48V system |
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2018
- 2018-12-25 CN CN201811591701.1A patent/CN109655184A/en active Pending
Patent Citations (7)
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| RU2428672C2 (en) * | 2009-05-26 | 2011-09-10 | Федеральное государственное образовательное учреждение высшего профессионального образования Новосибирский государственный аграрный университет | Method of determining technical state of internal combustion engines and expert system for realising said method |
| CN105121241A (en) * | 2013-04-16 | 2015-12-02 | 丰田自动车株式会社 | Vehicle control device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111396203A (en) * | 2020-03-26 | 2020-07-10 | 扬州翊翔航空科技有限公司 | Auxiliary starting device of micro hybrid system for unmanned aerial vehicle and control method |
| CN114993541A (en) * | 2022-05-27 | 2022-09-02 | 中国第一汽车股份有限公司 | Method and system for testing starting static friction torque of 48V system |
| CN114993541B (en) * | 2022-05-27 | 2023-09-22 | 中国第一汽车股份有限公司 | Method and system for testing starting static friction torque of 48V system |
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Application publication date: 20190419 |