CN113378359A - Method and device for evaluating oil consumption of engine and transmission efficiency of whole vehicle - Google Patents
Method and device for evaluating oil consumption of engine and transmission efficiency of whole vehicle Download PDFInfo
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Abstract
The invention discloses a method and a device for evaluating the oil consumption of an engine and the transmission efficiency of a whole vehicle, wherein the method comprises the following steps: acquiring universal characteristic data of an engine of a prototype, a plurality of running state data of a vehicle to be evaluated when the vehicle runs on a whole vehicle rotating hub and whole vehicle transmission efficiency test data; each operating state data includes: working condition data under corresponding engine working conditions and real-time oil consumption corresponding to the working condition data; the whole vehicle transmission efficiency test data comprises: the system comprises a hub inertia, a hub resistance coefficient, a real-time vehicle speed, a real-time acceleration and an engine real-time power; evaluating the fuel consumption of the vehicle engine to be evaluated under each engine working condition according to the universal characteristic data and the real-time fuel consumption of the engine; and calculating the transmission efficiency of the whole vehicle according to the inertia of the rotating hub, the resistance coefficient of the rotating hub, the real-time speed, the real-time acceleration and the real-time power of the engine. By implementing the method and the device, the accuracy of oil consumption evaluation can be improved, and the transmission efficiency of the whole vehicle can be evaluated.
Description
Technical Field
The invention relates to the technical field of vehicle performance detection, in particular to a method and a device for evaluating the oil consumption of an engine and the transmission efficiency of a whole vehicle.
Background
In vehicle development, a host factory generally needs to test and evaluate the oil consumption and transmission efficiency of a vehicle, but in the prior art, when the oil consumption of the vehicle is evaluated, the good and bad conditions of the oil consumption of the vehicle are evaluated based on the average oil consumption of the vehicle after the vehicle runs for a certain section of mileage displayed on a vehicle instrument, and by adopting the method, only one rough evaluation can be carried out on the overall oil consumption of the vehicle, and the good and bad conditions of the oil consumption of a vehicle engine in real time under different working conditions cannot be known. For the evaluation of the vehicle transmission efficiency, the transmission efficiency of the single transmission wheel and the single driving wheel can only be tested independently, and the transmission efficiency of the whole vehicle in the whole process from an engine to a wheel end (transmission route: engine-transmission-driving shaft/bridge-hub-wheel end) cannot be tested uniformly.
Disclosure of Invention
The embodiment of the invention provides an evaluation method for the fuel consumption of an engine and the transmission efficiency of a whole vehicle, which can evaluate the real-time fuel consumption of the engine of the vehicle under different working conditions, improve the precision of fuel consumption evaluation and carry out integral evaluation on the transmission efficiency of the whole vehicle of the vehicle.
An embodiment of the invention provides a method for evaluating the oil consumption of an engine and the transmission efficiency of a whole vehicle, which comprises the following steps:
acquiring universal characteristic data of an engine of a prototype, a plurality of running state data of a vehicle to be evaluated when the vehicle runs on a whole vehicle rotating hub and a plurality of whole vehicle transmission efficiency test data; wherein each of the operation state data includes: working condition data under corresponding engine working conditions and real-time oil consumption corresponding to the working condition data; each whole vehicle transmission efficiency test data comprises: the system comprises a hub inertia, a hub resistance coefficient, a real-time vehicle speed, a real-time acceleration and an engine real-time power;
according to the universal characteristic data of the engine and the real-time oil consumption, evaluating the oil consumption of the vehicle engine to be evaluated under each engine working condition;
calculating the acceleration power of the vehicle to be evaluated on the whole vehicle hub according to the hub inertia, the real-time acceleration and the real-time vehicle speed; calculating the running resistance power of the vehicle to be evaluated on the whole vehicle hub according to the hub resistance coefficient and the real-time vehicle speed; and calculating the whole vehicle transmission efficiency of the vehicle to be evaluated according to the real-time power of the engine, the acceleration power and the running resistance power.
Further, according to the universal characteristic data of the engine and the real-time oil consumption, the fuel consumption quality of the vehicle engine to be evaluated under each engine working condition is evaluated, and the method specifically comprises the following steps:
comparing the real-time oil consumption under each engine working condition with the standard oil consumption under the same engine working condition in the universal characteristic data of the engine; the working condition data under the same engine working condition are the same and comprise real-time rotating speed and real-time torque;
obtaining the fuel consumption evaluation result of the vehicle engine to be evaluated under each engine working condition according to the comparison result of each real-time fuel consumption and the corresponding standard fuel consumption; when the real-time oil consumption is lower than that of the standard oil, the oil consumption good and bad evaluation result is good, and when the real-time oil consumption is higher than that of the standard oil, the oil consumption good and bad evaluation result is bad.
Further, the method also comprises the following steps: generating an engine universal characteristic curve graph according to the engine universal characteristic data;
and according to the working condition data in each running state data, identifying the real-time oil consumption of each running state data in the engine universal characteristic curve graph, and generating a relational graph of the real-time oil consumption and the universal characteristic curve graph of the vehicle engine to be evaluated.
Further, calculating the acceleration power of the vehicle to be evaluated on the whole vehicle hub according to the hub inertia, the real-time acceleration and the real-time vehicle speed specifically comprises:
calculating the acceleration power of the vehicle to be evaluated on the whole vehicle hub by the following formula:
P2＝(M*a*V)/3600；
wherein M is the hub inertia; a is the real-time acceleration; and V is the real-time vehicle speed.
Further, calculating the running resistance power of the vehicle to be evaluated on the whole vehicle hub according to the hub resistance coefficient and the real-time vehicle speed specifically comprises:
calculating the running resistance power of the vehicle to be evaluated on the whole vehicle hub by the following formula:
P3＝[(A+B*V+C*V2)*V]/3600；
wherein A, B and C are the resistance coefficients of the rotating hub.
Further, calculating the overall transmission efficiency of the vehicle to be evaluated according to the real-time power of the engine, the acceleration power and the running resistance power, and specifically comprises:
calculating the whole vehicle transmission efficiency of the vehicle to be evaluated through the following formula:
η＝(P2+P3)/P1；
wherein, P1Real-time power is provided to the engine.
On the basis of the above method item embodiments, the present invention correspondingly provides apparatus item embodiments;
the invention provides an evaluation device for the oil consumption quality of an engine and the transmission efficiency of a whole vehicle, which comprises a data acquisition module, a real-time oil consumption evaluation module and a whole vehicle transmission efficiency evaluation module;
the data acquisition module is used for acquiring universal characteristic data of an engine of the prototype, a plurality of running state data of a vehicle to be evaluated when the vehicle runs on a whole vehicle rotating hub and a plurality of whole vehicle transmission efficiency test data; wherein each of the operation state data includes: working condition data under corresponding engine working conditions and real-time oil consumption corresponding to the working condition data; each whole vehicle transmission efficiency test data comprises: the system comprises a hub inertia, a hub resistance coefficient, a real-time vehicle speed, a real-time acceleration and an engine real-time power;
the real-time oil consumption evaluation module is used for evaluating the oil consumption quality of the vehicle engine to be evaluated under each engine working condition according to the universal characteristic data of the engine and the real-time oil consumption;
the whole vehicle transmission efficiency evaluation module is used for calculating the acceleration power of the vehicle to be evaluated on the whole vehicle hub according to the rotating hub inertia, the real-time acceleration and the real-time vehicle speed; calculating the running resistance power of the vehicle to be evaluated on the whole vehicle hub according to the hub resistance coefficient and the real-time vehicle speed; and calculating the whole vehicle transmission efficiency of the vehicle to be evaluated under each whole vehicle transmission efficiency test data according to the real-time power of the engine, the acceleration power and the running resistance power.
The embodiment of the invention has the following beneficial effects:
the invention provides a method and a device for evaluating the oil consumption of an engine and the transmission efficiency of a whole vehicle. And on the other hand, the whole vehicle power transmission power of the vehicle to be evaluated when the vehicle runs on the rotating hub is calculated based on the rotating hub inertia, the rotating hub resistance coefficient, the real-time vehicle speed, the real-time acceleration and the real-time engine power of the vehicle to be evaluated when the vehicle runs on the whole vehicle hub.
Drawings
Fig. 1 is a schematic flow chart of a method for evaluating fuel consumption of an engine and transmission efficiency of a finished vehicle according to an embodiment of the present invention.
Fig. 2 is a graph showing all the characteristics of the prototype according to an embodiment of the present invention.
FIG. 3 is a graph of the relationship between the engine and the universal characteristic curve of the vehicle to be evaluated according to one embodiment of the present invention.
Fig. 4 is a schematic structural diagram of an apparatus for evaluating fuel consumption of an engine and transmission efficiency of a whole vehicle according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
As shown in fig. 1, an embodiment of the present invention provides a method for evaluating the oil consumption of an engine and the transmission efficiency of a whole vehicle, including:
s101, acquiring universal characteristic data of an engine of a prototype, a plurality of running state data of a vehicle to be evaluated when the vehicle runs on a whole vehicle rotating hub and whole vehicle transmission efficiency test data; wherein each of the operation state data includes: working condition data under corresponding engine working conditions and real-time oil consumption corresponding to the working condition data; the whole vehicle transmission efficiency test data comprises: hub inertia, hub drag coefficient, real-time vehicle speed, real-time acceleration, and engine real-time power.
Step S102: and evaluating the fuel consumption of the vehicle engine to be evaluated under each engine working condition according to the universal characteristic data of the engine and the real-time fuel consumption.
Step S103: calculating the acceleration power of the vehicle to be evaluated on the whole vehicle hub according to the hub inertia, the real-time acceleration and the real-time vehicle speed; calculating the running resistance power of the vehicle to be evaluated on the whole vehicle hub according to the hub resistance coefficient and the real-time vehicle speed; and calculating the whole vehicle transmission efficiency of the vehicle to be evaluated according to the real-time power of the engine, the acceleration power and the running resistance power.
For step S101: the universal characteristic data of the engine records the oil consumption of the engine under various engine working conditions (engine rotating speed and engine torque), the universal characteristic data of the engine of a prototype is firstly obtained, and the oil consumption in the universal characteristic data of the engine is used as the standard for subsequent evaluation of oil consumption; in addition, data acquisition is carried out when the vehicle to be evaluated runs on the whole vehicle rotating hub, and a plurality of running state data and a plurality of whole vehicle transmission efficiency test data are obtained;
exemplary partial operating condition data collected by the present invention are shown in table 1 below:
TABLE 1
As shown in table 1, each operating state data includes operating condition data (real-time rotation speed and real-time torque in the table) of the engine under various operating conditions, and real-time oil consumption; preferably, the real-time oil consumption CAN be converted into CO by designing a Fuel consumption variable on the CAN of the whole vehicle2The relationship with the fuel consumption is obtained;
the following table 2 shows part of the collected transmission efficiency test data of the whole vehicle according to the exemplary embodiment of the present invention:
TABLE 2
Before the evaluation of the invention is started, a vehicle road sliding resistance curve is input into a hub dynamometer, the vehicle is loaded and slid according to the hub inertia corresponding to the vehicle preparation quality to be evaluated, finally the vehicle road resistance curve is converted into the resistance curve of the hub, the hub inertia corresponding to the vehicle preparation quality to be evaluated of a hub resistance coefficient can be obtained according to the resistance curve of the hub, and the hub inertia can be obtained by inquiring the GB 18352.6-2016 light automobile pollutant emission limit value and the measurement method (the sixth stage in China) according to the vehicle preparation quality.
For step S102: in a preferred embodiment, the evaluating, according to the universal characteristic data of the engine and the real-time oil consumption, the fuel consumption of the vehicle engine to be evaluated under each engine working condition specifically includes:
comparing the real-time oil consumption under each engine working condition with the standard oil consumption under the same engine working condition in the universal characteristic data of the engine; the working condition data under the same engine working condition are the same and comprise real-time rotating speed and real-time torque;
obtaining the fuel consumption evaluation result of the vehicle engine to be evaluated under each engine working condition according to the comparison result of each real-time fuel consumption and the corresponding standard fuel consumption; when the real-time oil consumption is lower than that of the standard oil, the oil consumption good and bad evaluation result is good, and when the real-time oil consumption is higher than that of the standard oil, the oil consumption good and bad evaluation result is bad.
Taking the first piece of operating state data shown in table 1 as an example: the real-time rotating speed of the current vehicle engine to be evaluated is 754.46rpm, the real-time torque is 4.98NM, and under the working condition of the engine, the corresponding real-time oil consumption of the vehicle engine to be evaluated is 1393.39 g/kWh; then, when the engine rotation speed is 754.46rpm and the engine torque is 4.98NM, the oil consumption of the prototype is assumed to be A; comparing 1393.39g/kWh with A, if 1393.39g/kWh is not less than A, indicating that the oil consumption of the vehicle engine to be evaluated is greater than that of the original machine under the same engine working condition, at the moment, marking the evaluation result of the oil consumption of the vehicle engine to be evaluated as poor under the engine working condition, if 1393.39g/kWh is not greater than A, indicating that the oil consumption of the vehicle engine to be evaluated is less than that of the original machine under the same engine working condition, at the moment, marking the evaluation result of the oil consumption of the vehicle engine to be evaluated as good under the engine working condition, and so on, comparing the real-time oil consumption in each piece of running state data with the oil consumption in the engine universal characteristic data, and obtaining the good oil consumption condition of the vehicle engine to be evaluated under various engine working conditions. Compared with the prior art, the embodiment of the invention can evaluate the instantaneous oil consumption of the engine under various working conditions, the granularity of oil consumption evaluation is smaller, the precision is higher, and the accuracy of oil consumption evaluation is further improved.
For step S103, in a preferred embodiment, the calculating the acceleration power of the vehicle to be evaluated on the entire vehicle hub according to the hub inertia, the real-time acceleration and the real-time vehicle speed specifically includes: calculating the acceleration power of the vehicle to be evaluated on the whole vehicle hub by the following formula:
P2＝(M*a*V)/3600；
wherein M is the hub inertia; a is the real-time acceleration; and V is the real-time vehicle speed.
The method for calculating the running resistance power of the vehicle to be evaluated on the whole vehicle hub according to the hub resistance coefficient and the real-time vehicle speed specifically comprises the following steps:
calculating the running resistance power of the vehicle to be evaluated on the whole vehicle hub by the following formula:
P3＝[(A+B*V+C*V2)*V]/3600；
wherein A, B and C are the resistance coefficients of the rotating hub.
Calculating the whole vehicle transmission efficiency of the vehicle to be evaluated according to the real-time power of the engine, the acceleration power and the running resistance power, and specifically comprising the following steps of:
calculating the whole vehicle transmission efficiency of the vehicle to be evaluated through the following formula:
η＝(P2+P3)/P1；
wherein, P1Real-time work for the engineAnd (4) rate.
The whole vehicle transmission efficiency corresponding to each whole vehicle transmission efficiency test data shown in table 2 is calculated according to the method and is shown in table 3:
TABLE 3
According to the transmission efficiency obtained by the method, the whole vehicle transmission efficiency of the vehicle to be evaluated is evaluated. Compared with the prior art, the transmission efficiency obtained by the method comprehensively considers all resistances on the transmission chains such as the engine, the speed changer, the transmission shaft, the hub and the like, is the whole vehicle transmission efficiency in the whole process from the engine to the wheel end, and solves the problem that the whole vehicle transmission efficiency in the whole process from the engine to the wheel end cannot be uniformly tested in the prior art.
In a preferred embodiment, the method for evaluating fuel consumption of an engine and transmission efficiency of a vehicle further includes: generating an engine universal characteristic curve graph according to the engine universal characteristic data;
and according to the working condition data in each running state data, identifying the real-time oil consumption of each running state data in the engine universal characteristic curve graph, and generating a relational graph of the real-time oil consumption and the universal characteristic curve graph of the vehicle engine to be evaluated.
Through the embodiment, a user can visually see the advantages and disadvantages of the oil consumption of the vehicle engine to be evaluated under various engine working conditions through the schematic diagram. Specifically, the engine universal characteristic diagram is shown in fig. 2, and the relationship diagram generated after the real-time fuel consumption of each piece of the operation state data is identified in the engine universal characteristic diagram is shown in fig. 3.
On the basis of the above method item embodiments, the present invention correspondingly provides apparatus item embodiments;
as shown in fig. 4, an embodiment of the present invention provides an apparatus for evaluating the oil consumption of an engine and the transmission efficiency of a whole vehicle, including a data acquisition module, a real-time oil consumption evaluation module, and a whole vehicle transmission efficiency evaluation module;
the data acquisition module is used for acquiring universal characteristic data of an engine of the prototype, a plurality of running state data of a vehicle to be evaluated when the vehicle runs on a whole vehicle rotating hub and a plurality of whole vehicle transmission efficiency test data; wherein each of the operation state data includes: working condition data under corresponding engine working conditions and real-time oil consumption corresponding to the working condition data; each whole vehicle transmission efficiency test data comprises: the system comprises a hub inertia, a hub resistance coefficient, a real-time vehicle speed, a real-time acceleration and an engine real-time power;
the real-time oil consumption evaluation module is used for evaluating the oil consumption quality of the vehicle engine to be evaluated under each engine working condition according to the universal characteristic data of the engine and the real-time oil consumption;
the whole vehicle transmission efficiency evaluation module is used for calculating the acceleration power of the vehicle to be evaluated on the whole vehicle hub according to the rotating hub inertia, the real-time acceleration and the real-time vehicle speed; calculating the running resistance power of the vehicle to be evaluated on the whole vehicle hub according to the hub resistance coefficient and the real-time vehicle speed; and calculating the whole vehicle transmission efficiency of the vehicle to be evaluated under each whole vehicle transmission efficiency test data according to the real-time power of the engine, the acceleration power and the running resistance power.
It should be noted that the above-mentioned apparatus embodiment corresponds to the method embodiment of the present invention, and it can implement the method for evaluating the oil consumption of the engine and the transmission efficiency of the whole vehicle described in any one of the above-mentioned method embodiments of the present invention; furthermore, the above-described device embodiments are merely illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (7)
1. A method for evaluating the oil consumption of an engine and the transmission efficiency of a whole vehicle is characterized by comprising the following steps:
acquiring universal characteristic data of an engine of a prototype, a plurality of running state data of a vehicle to be evaluated when the vehicle runs on a whole vehicle rotating hub and whole vehicle transmission efficiency test data; wherein each of the operation state data includes: working condition data under corresponding engine working conditions and real-time oil consumption corresponding to the working condition data; the whole vehicle transmission efficiency test data comprises: the system comprises a hub inertia, a hub resistance coefficient, a real-time vehicle speed, a real-time acceleration and an engine real-time power;
according to the universal characteristic data of the engine and the real-time oil consumption, evaluating the oil consumption of the vehicle engine to be evaluated under each engine working condition;
calculating the acceleration power of the vehicle to be evaluated on the whole vehicle hub according to the hub inertia, the real-time acceleration and the real-time vehicle speed; calculating the running resistance power of the vehicle to be evaluated on the whole vehicle hub according to the hub resistance coefficient and the real-time vehicle speed; and calculating the whole vehicle transmission efficiency of the vehicle to be evaluated according to the real-time power of the engine, the acceleration power and the running resistance power.
2. The method for evaluating the fuel consumption of the engine and the transmission efficiency of the vehicle as claimed in claim 1, wherein the evaluating the fuel consumption of the vehicle engine to be evaluated under each engine working condition according to the universal characteristic data of the engine and the real-time fuel consumption specifically comprises:
comparing the real-time oil consumption under each engine working condition with the standard oil consumption under the same engine working condition in the universal characteristic data of the engine; the working condition data under the same engine working condition are the same and comprise real-time rotating speed and real-time torque;
obtaining the fuel consumption evaluation result of the vehicle engine to be evaluated under each engine working condition according to the comparison result of each real-time fuel consumption and the corresponding standard fuel consumption; when the real-time oil consumption is lower than that of the standard oil, the oil consumption good and bad evaluation result is good, and when the real-time oil consumption is higher than that of the standard oil, the oil consumption good and bad evaluation result is bad.
3. The method of claim 2, further comprising:
generating an engine universal characteristic curve graph according to the engine universal characteristic data;
and according to the working condition data in each running state data, identifying the real-time oil consumption of each running state data in the engine universal characteristic curve graph, and generating a relational graph of the real-time oil consumption and the universal characteristic curve graph of the vehicle engine to be evaluated.
4. The method for evaluating the fuel consumption of the engine and the transmission efficiency of the vehicle as claimed in claim 1, wherein the step of calculating the acceleration power of the vehicle to be evaluated on the whole vehicle hub according to the inertia of the rotating hub, the real-time acceleration and the real-time vehicle speed specifically comprises the steps of:
calculating the acceleration power of the vehicle to be evaluated on the whole vehicle hub by the following formula:
P2＝(M*a*V)/3600；
wherein M is the hub inertia; a is the real-time acceleration; and V is the real-time vehicle speed.
5. The method for evaluating the oil consumption of the engine and the transmission efficiency of the vehicle according to claim 3, wherein the step of calculating the running resistance power of the vehicle to be evaluated on the whole vehicle hub according to the rotating hub resistance coefficient and the real-time vehicle speed specifically comprises the following steps:
calculating the running resistance power of the vehicle to be evaluated on the whole vehicle hub by the following formula:
P3＝[(A+B*V+C*V2)*V]/3600；
wherein A, B and C are the resistance coefficients of the rotating hub.
6. The method for evaluating the fuel consumption of the engine and the transmission efficiency of the vehicle according to claim 4, wherein the calculating the transmission efficiency of the vehicle to be evaluated according to the real-time power of the engine, the acceleration power and the driving resistance power specifically comprises:
calculating the whole vehicle transmission efficiency of the vehicle to be evaluated through the following formula:
η＝(P2+P3)/P1；
wherein, P1Real-time power is provided to the engine.
7. An evaluation device for the advantages and disadvantages of engine oil consumption and the transmission efficiency of a whole vehicle is characterized by comprising a data acquisition module, a real-time oil consumption evaluation module and a whole vehicle transmission efficiency evaluation module;
the data acquisition module is used for acquiring universal characteristic data of an engine of the prototype, a plurality of running state data of a vehicle to be evaluated when the vehicle runs on a whole vehicle rotating hub and a plurality of whole vehicle transmission efficiency test data; wherein each of the operation state data includes: working condition data under corresponding engine working conditions and real-time oil consumption corresponding to the working condition data; each whole vehicle transmission efficiency test data comprises: the system comprises a hub inertia, a hub resistance coefficient, a real-time vehicle speed, a real-time acceleration and an engine real-time power;
the real-time oil consumption evaluation module is used for evaluating the oil consumption quality of the vehicle engine to be evaluated under each engine working condition according to the universal characteristic data of the engine and the real-time oil consumption;
the whole vehicle transmission efficiency evaluation module is used for calculating the acceleration power of the vehicle to be evaluated on the whole vehicle hub according to the rotating hub inertia, the real-time acceleration and the real-time vehicle speed; calculating the running resistance power of the vehicle to be evaluated on the whole vehicle hub according to the hub resistance coefficient and the real-time vehicle speed; and calculating the whole vehicle transmission efficiency of the vehicle to be evaluated under each whole vehicle transmission efficiency test data according to the real-time power of the engine, the acceleration power and the running resistance power.
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