CN113532731A - Output torque calibration method for range extender system - Google Patents
Output torque calibration method for range extender system Download PDFInfo
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- CN113532731A CN113532731A CN202110705035.5A CN202110705035A CN113532731A CN 113532731 A CN113532731 A CN 113532731A CN 202110705035 A CN202110705035 A CN 202110705035A CN 113532731 A CN113532731 A CN 113532731A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
- G01L25/003—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency for measuring torque
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/62—Hybrid vehicles
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Abstract
A method for checking output torque of a range extender system belongs to the technical field of calibration of range extender racks. The torque control method realizes the accurate control of the output torque of the range extender, the calculated torque of the engine and the power generation torque, improves the torque control accuracy of the range extender, and is beneficial to improving the operation efficiency of the range extender system. S1, completing basic performance calibration of a range extender rack; s2, making a torque check grid area of the range extender system; s3, controlling the range extender to reach the target rotating speed of the range extender until the position of a rotating speed coordinate point of the engine load table; s4, enabling the load rate of the engine to reach the load rate axis position of the load rate table; s5, enabling the torque generation electric torque of the range extender to be approximately equal to the target torque of the range extender; s6, enabling the feedback torque value of the engine to be basically consistent with the target torque value; and S7, repeating the torque verification steps of the range extender to complete the torque verification of all working condition points in the range extender verification grid area. The method is beneficial to improving the accuracy of the energy consumption calibration process of the range extender.
Description
Technical Field
The invention belongs to the technical field of calibration of a range extender rack, and particularly relates to a method for calibrating output torque of a range extender system.
Background
The extended range electric vehicle is one of new energy electric vehicles, has excellent driving performance of the electric vehicle, eliminates the problem of anxiety of the endurance mileage of the electric vehicle, and is paid more and more attention at present. The connection mode that the range extender engine is directly connected with the range extender motor has the advantages of low cost and compact structure, but after the crankshaft of the range extender engine is added with the rotor of the range extender motor, the rotational inertia and the resisting moment of the range extender engine are changed, so that the torque model of the range extender engine generates deviation, and the accuracy of torque control during the operation of the range extender is influenced, and therefore the torque control precision of the range extender system needs to be corrected.
Disclosure of Invention
The invention aims to provide a method for checking the output torque of a range extender system, which realizes the accurate control of the output torque of the range extender, the calculated torque of an engine and the generated torque, improves the torque control accuracy of the range extender and is beneficial to improving the operation efficiency of the range extender system.
The technical scheme adopted by the invention is as follows: a method for verifying output torque of a range extender system comprises the following steps:
s1, after confirming that the range extender has no problem, correcting the torque of the range extender;
s2, making a torque check grid area of the range extender system;
s3, controlling the range extender to reach the target rotating speed of the range extender until the position of a rotating speed coordinate point of an output torque calibration table of the engine range extender;
s4, adjusting the target torque of the range extender to enable the load rate of the engine to reach the load rate axis position of the output torque calibration table of the range extender;
s5, increasing or reducing the output torque of the engine by adjusting the intersection point calibration quantity of the rotating speed and the load rate in the output torque calibration table of the range extender of the engine, so that the power generation torque of the range extender is approximately equal to the target torque of the range extender;
s6, keeping the rotating speed of the range extender unchanged, adjusting the target power of the range extender to enable the intake pressure value of the engine to be consistent with the intake pressure shaft value in the torque calculation table, and adjusting the intersection point calibration quantity of the intake pressure and the rotating speed to enable the calculated torque value of the engine to be basically consistent with the target torque value;
and S7, repeating the torque verification steps of the range extender to complete the torque verification of all working condition points in the range extender torque verification grid area.
The invention has the beneficial effects that:
1. aiming at the range extender with the engine crankshaft of the range extender directly connected with the generator rotor, the target torque of the range extender is taken as a reference, the output torque (power generation torque) of the range extender is taken as a measurement scale, and consistency check of the target torque of the range extender, the power generation torque (output torque of the range extender) and the calculated torque of the engine is realized by adjusting the output torque of the engine and a method for calculating the output torque of the engine, so that the accuracy of energy consumption calibration of the range extender is improved, and reliable basic data which can be used for reference is provided for state confirmation of the range extender.
2. The target torque of the range extender is taken as a reference, the calculated torque value of the engine is verified to the target torque value of the range extender, the target torque of the range extender, the output torque of the range extender and the calculated torque of the engine are unified, and the torque control precision of the range extender in the operation process is improved.
3. From the angle of fault detection, the calculated value of the engine torque is calculated by engine parameters, the calculated value of the generator torque is calculated by motor parameters, and if the calculated torque of the generator or the calculated torque of the engine has larger deviation with the target torque, a fault source can be accurately positioned, and a monitoring means of the working state of the range extender is added.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a diagram of the range extender operating region
Detailed Description
For a better understanding of the objects, structure and function of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings 1-2.
The method comprises the unified calibration of three torques of the range extender target torque, the range extender output torque and the engine calculated torque. The invention takes the target torque as the reference, and the output torque of the engine, the calculated torque of the engine and the target torque of the range extender are consistent under the target rotating speed, thereby realizing the accurate operation of the range extender. The calculated torque of the engine and the calculated torque of the generator (power generation torque) are calculated by respective operation parameters, and when the torques deviate, the abnormal operation of the range extender can be found in time, the operation efficiency of the range extender is improved, and fault detection and consistency check means of the range extender are added.
The crankshaft of the range extender engine is directly connected with the rotor of the generator, the output torque of the engine is the same as that of the generator, and the output torque characteristic of the engine and the output torque characteristic of the generator have inherent difference. The output torque of the engine generally rises to the peak torque first and then slightly falls along with the increase of the rotating speed of the engine; the torque of the generator can reach the peak torque at a low rotating speed, and the output torque of the generator can rapidly drop along with the flux weakening control of the generator after the torque reaches a rated working point. The present patent therefore sets forth a torque-intersect rotational speed concept Ninter (hereinafter Ninter refers to torque-intersect rotational speed).
S1: after confirming that the range extender has no problem, starting torque correction of the range extender;
and (5) confirming that the range extender has no fault and can be started and generate power normally.
S2: confirming a torque check grid area of the range extender system;
s21: confirming the operating range of the external characteristic of the range extender
The working area of the range extender of the present invention is shown in fig. 2.
The torque testing external characteristic region of the range extender is required to be within the operation working region of the range extender, generally, the torque of the generator is larger than the torque of the engine before the rotating speed corresponding to the intersection point of the maximum torque of the engine and the maximum torque of the generator (hereinafter referred to as torque intersection rotating speed Ninter), and the torque of the engine is larger than the torque of the generator after the torque intersection rotating speed; the range extender rotating speed working range is determined by the engine and the generator together, and is also an outer characteristic coincidence region of the engine and the generator.
The minimum rotating speed of the range extender is the minimum calibrated rotating speed of the engine, and the upper limit of the rotating speed of the range extender is determined by the highest torque-output rotating speed of the generator.
When the actual operation rotating speed N of the range extender is less than the Ninter, the torque upper limit Tmax of the range extender is equal to the special engine torque upper limit T _ ENG _ MAX of the range extender; and when the actual operating speed N of the range extender is greater than the Ninter, the torque upper limit Tmax of the range extender is the torque upper limit T _ G _ MAX of the generator.
S22: determining an output torque check point of the range extender;
the table 1 is a range extender output torque check table which is read by connecting the upper computer software of the engine control unit with the engine control unit, and the table determines the output torque check point of the range extender.
In table 1, the horizontal axis represents the rotation speed, the vertical axis represents the engine load rate, and the actual output torque of the engine, that is, the output torque of the range extender, can be changed while the rotation speed of the engine is maintained unchanged by changing the calibration quantity of the intersection point of the current rotation speed and the engine load rate.
TABLE 1 Range extender output Torque calibration chart (Engine load rate table)
S23: identifying a range extender-engine calculated torque point;
table 2 is a range extender-engine calculated torque calibration table. The table is obtained by real-time reading after the software of the upper computer of the engine control unit is connected with the engine control unit, and the table determines the calibration point of the calculated torque of the range extender-engine.
In table 2, intake pressure is shown on the horizontal axis and rotational speed is shown on the vertical axis, and the calculated torque value of the range extender-engine can be corrected by changing the calibration amount of the intersection of the rotational speed and the intake pressure.
TABLE 2 Endurator-Engine calculated Torque calibration Table
And finishing the confirmation of the torque verification grid area of the range extender system.
S3: and controlling the range extender to reach the target rotating speed of the range extender, and outputting the rotating speed coordinate point position in a torque calibration table (table 1) of the range extender.
S4: and adjusting the target torque of the range extender to enable the load rate of the engine to reach the load rate axis position of the output torque calibration table of the range extender.
The actual requested torque (target torque) is resolved by equation (1):
target power (kW) ═ target speed (rpm) × target torque (N · m)/9550(1)
The target torque value obtained in the formula (1) is sent to the engine control unit, and the output of the target torque is executed by the engine.
S5: and adjusting the target power of the range extender, further adjusting the target torque of the engine, and enabling the load factor value of the engine control unit to be close to the position of a load factor axis corresponding to the output torque calibration table of the range extender.
The output torque of the engine is improved or reduced by adjusting the intersection point calibration quantity of the rotating speed and the load rate in the engine load rate table (table 1), so that the generating torque is approximately equal to the target torque of the range extender.
The calibration quantity of the intersection point of the rotating speed and the load rate in the table 1 is increased or reduced in an upper computer of the engine control unit, so that the output torque value of the range extender is equal to the target torque of the range extender, or the deviation of the output torque value of the range extender and the target torque is within the range of 3 N.m;
s6: keeping the rotating speed of the range extender unchanged, adjusting the target power of the range extender to make the air inlet pressure value of the engine consistent with the air inlet pressure axis value in the table 2, and adjusting the intersection point calibration quantity of the air inlet pressure and the rotating speed to make the calculated torque value of the engine basically consistent with the target torque value.
And increasing or decreasing the standard quantity of the intersection point of the air inlet pressure and the rotating speed in the table 2 to make the calculated torque value of the engine consistent with the target torque value of the range extender or make the deviation of the calculated torque value of the engine and the target torque value of the range extender within the range of 3 N.m.
S7: and repeating the steps from S3 to S6 to complete the torque verification step of the range extender, and completing all verification work of all the output torque verification points of the range extender and the calculated torque points of the range extender-engine in the working area of the range extender.
It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (5)
1. A method for verifying output torque of a range extender system is characterized by comprising the following steps: the method comprises the following steps:
s1, starting torque correction of the range extender after confirming that the range extender has no problem;
s2, confirming a torque check grid area of the range extender system;
s3, controlling the range extender to reach the target rotating speed of the range extender until the position of a rotating speed coordinate point of the engine load table;
s4, adjusting the target torque of the range extender to enable the load rate of the engine to reach the load rate axis position of the load rate table;
s5, increasing or reducing the output torque of the engine by adjusting the intersection point calibration quantity of the rotating speed and the load rate in the engine load rate table, so that the power generation torque of the range extender is approximately equal to the target torque of the range extender;
s6, keeping the rotating speed of the range extender unchanged, adjusting the target power of the range extender to enable the intake pressure value of the engine to be consistent with the intake pressure shaft value in the torque calculation table, and adjusting the intersection point calibration quantity of the intake pressure and the rotating speed to enable the calculated torque value of the engine to be basically consistent with the target torque value;
and S7, repeating the torque verification steps of the range extender to complete the torque verification of all working condition points in the range extender torque verification grid area.
2. The method of claim 1, wherein the method comprises: the specific steps of S2 formulating the range extender system torque check grid area are as follows:
s21, confirming an external characteristic working interval of the range extender;
s22, determining an output torque check point of the range extender;
the output torque check point of the range extender is obtained by reading after the software of the upper computer of the engine control unit is connected with the engine control unit.
S23, confirming a range extender-engine calculation torque point;
the range extender-engine calculated torque point is obtained by reading after the software of the upper computer of the engine control unit is connected with the engine control unit.
3. The method of claim 1, wherein the method comprises: in said S4; the actual requested torque is resolved by equation (1):
and (3) transmitting a target torque value obtained from the formula (1) at the current range extender rotating speed to an engine control unit, and executing the current target torque value by the engine, wherein the target power (kW) is the target rotating speed (rpm) and the target torque (N.m)/9550 (1).
4. The method of claim 1, wherein the method comprises: in S5, the range extender target torque is adjusted to adjust the target torque of the engine, the load rate value of the engine reaches the position of the longitudinal axis of the load rate table, then the intersection point calibration quantity of the load rate and the rotating speed is adjusted, and the calibration quantity is increased or decreased to make the output torque of the engine reach the target torque or deviate from the target torque within 3 Nm.
5. The method of claim 1, wherein the method comprises: in S7, after the current trial torque verification is completed, the target power regulation load rate is continuously increased to reach the second axis position of the torque verification table, and S3-S6 are repeated to complete the torque verification work of all grid points in the range extender working area.
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Cited By (1)
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