CN114942098B - Method for measuring maximum wheel power of automatic transmission automobile - Google Patents
Method for measuring maximum wheel power of automatic transmission automobile Download PDFInfo
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- CN114942098B CN114942098B CN202210468787.9A CN202210468787A CN114942098B CN 114942098 B CN114942098 B CN 114942098B CN 202210468787 A CN202210468787 A CN 202210468787A CN 114942098 B CN114942098 B CN 114942098B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/13—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the tractive or propulsive power of vehicles
- G01L5/136—Force sensors associated with a vehicle traction coupling
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0061—Force sensors associated with industrial machines or actuators
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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
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
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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
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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
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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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
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/84—Data processing systems or methods, management, administration
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- General Physics & Mathematics (AREA)
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- Analytical Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Control Of Transmission Device (AREA)
Abstract
The invention discloses a method for measuring the maximum wheel power of an automatic transmission automobile, which comprises the following steps: setting a test environment temperature and a relative humidity; after the rotating hub is preheated, the test vehicle is arranged on a rotating hub test bed to carry out vehicle heating until the water temperature of the engine is higher than the preset temperature; the vehicle is put into a D gear; setting an initial vehicle speed V of a required rotating hub 0 And the required rotating hub adjusts the vehicle speed V 1 The method comprises the steps of carrying out a first treatment on the surface of the Setting the initial vehicle speed of the rotating hub to V 0 Until the test vehicle is stabilized at the vehicle speed; stepping the accelerator of the test vehicle to the bottom in a preset time, and stabilizing the accelerator until the speed reaches V 1 Vehicle OBD data are synchronously acquired, the vehicle OBD data comprise hub power, and the maximum wheel edge power P of the test vehicle is determined through a power curve of hub test i I=1, 2, i, n, repeatedly executing the step n times; calculating the maximum wheel power output by the test vehicle
The formula is:
the method for measuring the maximum rim power of the automatic transmission automobile realizes the measurement of the maximum rim power of the automatic transmission automobile.
Description
Technical Field
The invention relates to the technical field of whole vehicle testing, in particular to a method for measuring maximum wheel power of an automatic transmission automobile.
Background
The automobile wheel side power characteristic refers to the power transmitted from the engine output power to the wheels through a certain gear of the transmission system when the opening degree of the throttle valve of the engine is fixed. The maximum rim power is one of the important indexes for evaluating the dynamic performance of an automobile, and the efficiency of a transmission system of the power system can be evaluated through the maximum rim power.
Currently, automobile dynamic development is basically developed around hundred kilometers of acceleration time, maximum climbing gradient of the automobile and highest speed of the automobile; the maximum rim power test evaluation method is lacking. In the product development process, in order to determine the performance index of the maximum rim power of the vehicle, the maximum rim power level of the vehicle often needs to be researched and tested. And to test the maximum rim power, the speed ratio information of the vehicle and the fixed gear are required to be known. For example, chinese patent document CN102809458A discloses a method for detecting a predetermined wheel rim power, and proposes a method for changing the existing full-load constant-speed control unsafe detection with a large overload amount into a partial-load constant-force control safe detection without overload, wherein the method is realized by knowing information such as a transmission ratio, a main reduction ratio, a tire radius and the like of each gear of a vehicle, and the method does not propose a method for determining the maximum wheel rim power of the vehicle and evaluating the efficiency of the transmission system. However, for an automatic transmission test vehicle, the speed ratio information is unknown, and the gear cannot be locked, so that the maximum wheel power level of the vehicle cannot be effectively known.
Disclosure of Invention
The invention aims to provide a method for measuring the maximum rim power of an automatic transmission automobile, which can realize the measurement of the maximum rim power of the automatic transmission automobile.
In order to achieve the above purpose, the present invention provides a method for measuring maximum rim power of an automatic transmission automobile, comprising the steps of:
setting a test environment temperature and a relative humidity;
after the rotating hub is preheated, the test vehicle is arranged on a rotating hub test bed to carry out vehicle heating until the water temperature of the engine is higher than the preset temperature;
the vehicle is put into a D gear;
setting an initial vehicle speed V of a required rotating hub 0 And the required rotating hub adjusts the vehicle speed V 1 ；
Setting the initial vehicle speed of the rotating hub to V 0 Until the test vehicle is stabilized at the vehicle speed; stepping the accelerator of the test vehicle to the bottom in a preset time, and stabilizing the accelerator until the speed reaches V 1 Vehicle OBD data are synchronously acquired, the vehicle OBD data comprise hub power, and the maximum wheel edge power P of the test vehicle is determined through a power curve of hub test i I=1, 2, i, n, repeatedly executing the step n times;
calculating the maximum wheel power output by the test vehicle
The formula is: />
Further, the required hub initial vehicle speed V is determined 0 The method specifically comprises the following steps:
(S1) setting the hub to a constant speed mode, and setting an initial value of an initial vehicle speed of the hub to a first vehicle speed;
(S2) stepping the accelerator to the bottom in a preset time, and stabilizing the accelerator until the speed of the test vehicle reaches the set hub initial speed;
(S3) judging whether the engine speed n changes, if so, turning to an execution step (S4); otherwise, the initial speed of the hub at the moment is taken as the required initial speed of the hub to be V 0 Ending the flow;
(S4) adjusting the initial speed of the rotating hub by a first preset increment, and turning to the execution of the step (S2).
Further, the value range of the first vehicle speed is [50km/h,80km/h ].
Further, the first preset increment is 5km/h.
Further, the determined required hub adjusts the vehicle speed V 1 The method specifically comprises the following steps:
(D1) The rotating hub is set to a constant speed mode, and the initial rotation is performedThe hub speed is set as the required hub initial speed V 0 Until the speed of the test vehicle stabilizes at V 0 ；
(D2) Setting the speed of the hub adjustment as a second speed;
(D3) Stepping the accelerator to the bottom in a preset time, and stabilizing the accelerator until the speed of the test vehicle reaches a set hub-rotating speed;
(D4) Acquiring the engine speed n, and judging whether n is greater than the engine speed n corresponding to the maximum net power e The method comprises the steps of carrying out a first treatment on the surface of the If yes, the hub adjustment vehicle speed at the moment is taken as the required adjustment vehicle speed V 1 Ending the flow; otherwise, the speed of the rotating hub is adjusted by a second preset increment, and the step (D3) is executed; wherein, the maximum net power corresponds to the engine speed n e And determining according to the public information of the test vehicle.
Further, the value range of the second vehicle speed is [100km/h,130km/h ].
Further, the second preset increment is 10km/h.
Further, the preset time is 1 second.
Further, the value range of the ambient temperature is [21 ℃,25 ℃).
Further, the relative humidity is in the range of [45% RH,55% RH ].
Compared with the prior art, the invention has the following advantages:
the method for measuring the maximum rim power of the automatic gear automobile solves the problem that the maximum rim power cannot be measured due to the fact that the gear information of the automobile is lost and the gear cannot be locked, and effectively obtains the maximum rim power level of the automobile.
Drawings
FIG. 1 is a flow chart of a method for measuring maximum rim power of an automatic transmission vehicle according to the present invention;
FIG. 2 is a schematic diagram of the present invention for determining an initial vehicle speed V0;
FIG. 3 is a schematic diagram of the present invention for determining an initial vehicle speed V0;
FIG. 4 is a schematic diagram of the present invention for determining an initial vehicle speed V1;
FIG. 5 is a schematic diagram of the present invention for determining an initial vehicle speed V1;
FIG. 6 is a schematic diagram of the present invention for measuring maximum rim power;
FIG. 7 is a schematic diagram of a maximum rim power measurement system for an automatic transmission vehicle according to the present invention.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings.
Referring to fig. 1 to 7, the embodiment discloses a method for measuring maximum wheel power of an automatic transmission automobile, which comprises the following steps:
setting a test environment temperature and a relative humidity;
after the rotating hub is preheated, the test vehicle is arranged on a rotating hub test bed to carry out vehicle heating until the water temperature of the engine is higher than the preset temperature; in this embodiment, the preset temperature is 90 ℃, which is determined according to practical situations.
The vehicle is put into a D gear;
setting an initial vehicle speed V of a required rotating hub 0 And the required rotating hub adjusts the vehicle speed V 1 ；
Setting the initial vehicle speed of the rotating hub to V 0 Until the test vehicle is stabilized at the vehicle speed; stepping the accelerator of the test vehicle to the bottom in a preset time, and stabilizing the accelerator until the speed reaches V 1 Vehicle OBD data are synchronously acquired, the vehicle OBD data comprise hub power, and the maximum wheel edge power P of the test vehicle is determined through a power curve of hub test i I=1, 2, i, n, repeatedly executing the step n times; n=4, and in some embodiments, other values may be used, which are not limited herein.
Calculating the maximum wheel power output by the test vehicle
The formula is: />
Calculating the vehicle power transmission efficiency eta by using the maximum wheel side power:
wherein P is e Is the maximum net power of the engine.
In this embodiment, the vehicle OBD data also includes vehicle speed, engine speed, water temperature, and oil temperature.
Referring to fig. 2 and 3, the required hub initial vehicle speed V is determined 0 The method specifically comprises the following steps:
(S1) setting the hub to a constant speed mode, and setting an initial value of an initial vehicle speed of the hub to a first vehicle speed;
(S2) stepping the accelerator to the bottom in a preset time, and stabilizing the accelerator until the speed of the test vehicle reaches the set hub initial speed;
(S3) judging whether the engine speed n changes, if so, turning to an execution step (S4); otherwise, the initial speed of the hub at the moment is taken as the required initial speed of the hub to be V 0 Ending the flow;
(S4) adjusting the initial speed of the rotating hub by a first preset increment, and turning to the execution of the step (S2).
In the present embodiment, the range of the first vehicle speed is [50km/h,80km/h ]. Optionally, the first vehicle speed is 50km/h.
In this embodiment, the first preset increment is 5km/h.
Referring to fig. 4 and 5, the determination demand hub adjustment vehicle speed V 1 The method specifically comprises the following steps:
(D1) The hub is set in a constant speed mode, and the initial hub speed is set as the required hub initial speed V 0 Until the speed of the test vehicle stabilizes at V 0 ；
(D2) Setting the speed of the hub adjustment as a second speed;
(D3) Stepping the accelerator to the bottom in a preset time, and stabilizing the accelerator until the speed of the test vehicle reaches a set hub-rotating speed;
(D4) Acquiring the engine speed n, and judging whether n is greater than the engine speed n corresponding to the maximum net power e The method comprises the steps of carrying out a first treatment on the surface of the If yes, the hub is adjusted to be the sameSpeed as required of the vehicle 1 Ending the flow; otherwise, the speed of the rotating hub is adjusted by a second preset increment, and the step (D3) is executed; wherein, the maximum net power corresponds to the engine speed n e And determining according to the public information of the test vehicle.
In the present embodiment, the range of the second vehicle speed is [100km/h,130km/h ]. Optionally, the first vehicle speed is 100km/h.
In this embodiment, the second preset increment is 10km/h.
In this embodiment, the preset time is 1 second.
In this embodiment, the value range of the ambient temperature is [21 ℃,25 ℃).
In this example, the relative humidity is in the range of [45% RH,55% RH ].
The method for measuring the maximum rim power of the automatic gear automobile solves the problem that the maximum rim power cannot be measured due to the fact that the gear information of the automobile is lost and the gear cannot be locked, and effectively obtains the maximum rim power level of the automobile.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (8)
1. The method for measuring the maximum wheel power of the automatic transmission automobile is characterized by comprising the following steps of:
setting a test environment temperature and a relative humidity;
after the rotating hub is preheated, the test vehicle is arranged on a rotating hub test bed to carry out vehicle heating until the water temperature of the engine is higher than the preset temperature;
the vehicle is put into a D gear;
determining a required hub initial vehicle speed V 0 And the required rotating hub adjusts the vehicle speed V 1 ；
Setting the initial speed of the rotating hub to V0 until the test vehicle is stabilized at the speed; stepping the accelerator of the test vehicle to the bottom in a preset time, stabilizing the accelerator until the vehicle speed reaches V1, synchronously collecting vehicle 0BD data, wherein the vehicle 0BD data comprises hub power, determining the maximum hub power Pi of the test vehicle through a power curve tested by the hub, wherein i=1, 2, …, i, … and n, and repeatedly executing the step n times;
calculating the maximum wheel power output by the test vehicle
The formula is: />
The initial vehicle speed V of the required rotating hub is determined 0 The method specifically comprises the following steps:
(S1) setting the hub to a constant speed mode, and setting an initial value of an initial vehicle speed of the hub to a first vehicle speed;
(S2) stepping the accelerator to the bottom in a preset time, and stabilizing the accelerator until the speed of the test vehicle reaches the set hub initial speed;
(S3) judging whether the engine speed n changes, if so, turning to an execution step (S4); otherwise, the initial speed of the hub at the moment is taken as the required initial speed of the hub to be V 0 Ending the flow;
(S4) adjusting the initial speed of the rotating hub by a first preset increment, and turning to an execution step (S2);
the method specifically comprises the following steps of:
(D1) The hub is set in a constant speed mode, and the initial hub speed is set as the required hub initial speed V 0 Until the speed of the test vehicle stabilizes at V 0 ；
(D2) Setting the speed of the hub adjustment as a second speed;
(D3) Stepping the accelerator to the bottom in a preset time, and stabilizing the accelerator until the speed of the test vehicle reaches a set hub-rotating speed;
(D4) Acquiring an engine rotating speed n, and judging whether n is larger than an engine rotating speed ne corresponding to the maximum net power; if yes, taking the hub adjustment vehicle speed at the moment as a required adjustment vehicle speed V1, and ending the flow; otherwise, the speed of the rotating hub is adjusted by a second preset increment, and the step (D3) is executed; the engine speed ne corresponding to the maximum net power is determined according to the public information of the test vehicle.
2. The method for measuring the maximum rim power of an automatic transmission automobile according to claim 1, wherein the method comprises the following steps: the value range of the first vehicle speed is [50km/h,80km/h ].
3. The method for measuring the maximum rim power of the automatic transmission automobile according to claim 2, wherein the method comprises the following steps: the first preset increment is 5km/h.
4. A method for measuring maximum rim power of an automatic transmission vehicle according to any one of claims 1 to 3, characterized by: the value range of the second vehicle speed is [100km/h,130km/h ].
5. The method for measuring the maximum rim power of the automatic transmission automobile according to claim 4, wherein the method comprises the following steps: the second preset increment is 10km/h.
6. The automatic transmission vehicle maximum rim power measurement method according to claim 1 or 2 or 3 or 5: the method is characterized in that: the preset time is 1 second.
7. The method for measuring the maximum rim power of an automatic transmission automobile according to claim 1, wherein the method comprises the following steps: the value range of the ambient temperature is [21 ℃,25 ℃).
8. The method for measuring the maximum rim power of an automatic transmission automobile according to claim 1, wherein the method comprises the following steps: the relative humidity is in the range of 45% RH and 55% RH.
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| CN202210468787.9A CN114942098B (en) | 2022-04-29 | 2022-04-29 | Method for measuring maximum wheel power of automatic transmission automobile |
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| CN115453152B (en) * | 2022-09-30 | 2024-06-14 | 东风汽车集团股份有限公司 | Method, device and equipment for detecting automobile speedometer and readable storage medium |
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