CN-121980773-A - Method and system for calculating fuel consumption of hybrid electric vehicle based on transient correction coefficient

CN121980773ACN 121980773 ACN121980773 ACN 121980773ACN-121980773-A

Abstract

The invention relates to the technical field of simulation analysis of new energy automobiles, in particular to a method and a system for calculating fuel consumption of a hybrid electric vehicle based on a transient correction coefficient, which fundamentally solve the problem of insufficient precision caused by neglecting dynamic response characteristics of an engine in traditional fuel consumption simulation by introducing the transient correction coefficient based on the power change rate of the engine, and by adopting the method, the working condition of the engine is not simply regarded as series connection of a series of steady-state points, but the fuel consumption characteristics in the power change process are dynamically captured, and the steady-state fuel consumption rate is dynamically corrected in real time, so that the fuel consumption calculated by simulation can more truly reflect the fuel consumption level of the vehicle under actual transient working conditions such as acceleration, deceleration and the like, the accuracy and the reliability of simulation results are obviously improved, and more accurate data support is provided for optimizing design and performance evaluation of the hybrid electric vehicle.

Inventors

ZHANG ZHEN
ZHANG RUIDONG
LUO GUANGTAO
LIU QIANG
KONG PAN

Assignees

西安法士特汽车传动有限公司

Dates

Publication Date: 20260505
Application Date: 20251231

Claims (10)

1. The method for calculating the fuel consumption of the hybrid electric vehicle based on the transient correction coefficient is characterized by comprising the following steps of: constructing a steady-state fuel consumption rate database through bench test; in the simulation process, acquiring the instantaneous rotating speed and the instantaneous torque of the engine at each moment in real time; Calculating the power change rate of the engine according to the instantaneous rotating speed and the instantaneous torque of the engine at adjacent moments; constructing a transient correction coefficient at the current moment based on the engine power change rate; Obtaining a current steady-state fuel consumption rate according to the rotating speed and torque of the engine at the current moment and a steady-state fuel consumption rate database; Obtaining a corrected transient fuel consumption rate according to the current steady-state fuel consumption rate and the transient correction coefficient at the current moment; And (5) accumulating the time of the corrected transient fuel consumption rate, thereby obtaining the final fuel consumption.
2. The transient correction coefficient-based fuel consumption calculation method for a hybrid vehicle model according to claim 1, characterized in that the engine power change rate The method comprises the following steps: Wherein, the The instantaneous engine speed at time t, The instantaneous torque of the engine at the time t, The data acquisition period is a simulation process.
3. The method for calculating the fuel consumption of the hybrid vehicle model based on the transient correction coefficient according to claim 2, wherein the transient correction coefficient at the current time is: where a is the load change rate influence coefficient and a is a non-negative number.
4. The method for calculating the fuel consumption of the hybrid vehicle model based on the transient modification coefficient according to claim 3, wherein the determination of the load change rate influence coefficient a includes the steps of: designing a transient test working condition; through bench test, the actual rotation speed of the engine at each moment i is synchronously acquired at high frequency Actual torque of engine Instantaneous fuel consumption measured by high-precision fuel consumption meter ; According to the collected actual rotation speed of the engine And the actual torque of the engine Obtaining the steady-state fuel consumption rate at the corresponding moment through a steady-state fuel consumption rate database ; According to steady-state fuel consumption rate at corresponding time Calculating to obtain steady-state reference fuel consumption at corresponding moment : Wherein, the Engine power at time i; based on instantaneous fuel consumption at the same moment And steady state reference fuel consumption Obtaining transient correction coefficients at corresponding moments : According to the actual rotation speed at adjacent moments And the actual torque of the engine Calculating the power change rate of the ith moment of the engine : Wherein, the The data acquisition period is the actual test process; At a corresponding power change rate at each time As an independent variable to And solving an optimal load change rate influence coefficient a by a linear regression algorithm as a dependent variable.
5. The method for calculating fuel consumption of a hybrid vehicle based on transient modification factors as defined in claim 4, wherein the modified transient fuel consumption rate 。
6. A hybrid electric vehicle type oil consumption calculation system based on a transient correction coefficient is characterized by comprising: the steady-state fuel consumption rate building module is used for building a steady-state fuel consumption rate database through bench test; the simulation data acquisition module is used for acquiring the instantaneous rotating speed and the instantaneous torque of the engine at each moment in real time in the simulation process; The power change rate calculation module is used for calculating the power change rate of the engine according to the instantaneous rotating speed and the instantaneous torque of the engine at adjacent moments; The transient correction coefficient calculation module is used for constructing a transient correction coefficient at the current moment based on the engine power change rate; the steady-state fuel consumption rate determining module is used for obtaining the current steady-state fuel consumption rate according to the rotating speed and the torque of the engine at the current moment and the steady-state fuel consumption rate database; The transient fuel consumption rate correction module is used for obtaining corrected transient fuel consumption rate according to the current steady-state fuel consumption rate and the transient correction coefficient at the current moment; and the oil consumption calculation module is used for carrying out time accumulation on the corrected transient fuel consumption rate to obtain the final oil consumption.
7. The transient correction factor-based hybrid vehicle model fuel consumption calculation system of claim 6, wherein the engine power change rate The method comprises the following steps: Wherein, the The instantaneous engine speed at time t, The instantaneous torque of the engine at the time t, The data acquisition period is a simulation process.
8. The transient modification factor-based hybrid vehicle model fuel consumption calculation system according to claim 7, wherein the modified transient fuel consumption rate The method comprises the following steps: The transient correction coefficient at the current moment is as follows: where a is the load change rate influence coefficient and a is a non-negative number.
9. The transient correction coefficient-based hybrid vehicle model fuel consumption calculation system according to claim 8, wherein the determination of the load change rate influence coefficient a is obtained by an experimental system including: the test working condition design module is used for designing transient test working conditions; The test data acquisition module is used for synchronously acquiring the actual rotation speed of the engine at each moment i at high frequency through bench test Actual torque of engine Instantaneous fuel consumption measured by high-precision fuel consumption meter ; A steady-state fuel consumption rate acquisition module for acquiring the actual rotation speed of the engine And the actual torque of the engine Obtaining the steady-state fuel consumption rate at the corresponding moment through a steady-state fuel consumption rate database ; A steady-state reference fuel consumption calculation module for calculating a steady-state fuel consumption rate according to the corresponding time Calculating to obtain steady-state reference fuel consumption at corresponding moment : Wherein, the Engine power at time i; a transient correction coefficient acquisition module for acquiring the instantaneous fuel consumption according to the same moment And steady state reference fuel consumption Obtaining transient correction coefficients at corresponding moments : A power change rate acquisition module for acquiring the actual rotation speed at adjacent time And the actual torque of the engine Calculating the power change rate of the ith moment of the engine : Wherein, the The data acquisition period is the actual test process; A load change rate influence coefficient calculation module for calculating a corresponding power change rate at each moment As an independent variable to And solving an optimal load change rate influence coefficient a by a linear regression algorithm as a dependent variable.
10. A computer-readable storage medium having a computer program stored thereon, wherein the program when executed by a processor implements the transient correction factor-based fuel consumption calculation method for a hybrid vehicle model according to any one of claims 1 to 5.

Description

Method and system for calculating fuel consumption of hybrid electric vehicle based on transient correction coefficient Technical Field The invention relates to the technical field of simulation analysis of new energy automobiles, in particular to a method and a system for calculating fuel consumption of a hybrid electric vehicle based on transient correction coefficients. Background In the research and development process of the hybrid power transmission system, dynamic performance and economical efficiency simulation are core links, wherein the accuracy degree of oil consumption calculation has instructive significance to the development of products to a certain extent. The main stream oil consumption calculation method in the industry at present comprises the steps of obtaining fuel consumption rate data (unit: g/kWh) under a steady-state working condition through an engine bench test, carrying out real-time table lookup on the steady-state fuel consumption rate corresponding to an engine at each moment in a simulation process to obtain an instantaneous fuel consumption rate (unit: g/h), and finally carrying out time accumulation on the variable to obtain the oil consumption. However, the method has the obvious disadvantage that the hybrid system is always in a transient working condition (such as acceleration and abrupt load change) in the actual running of the automobile, and the fuel consumption rate does not reach a steady state value instantaneously at the moment, but has dynamic response delay, such as the response of a fuel injection system, the change of the concentration of the mixed gas in a combustion chamber and the like, and the transient fuel consumption rate can be higher or lower than the steady state value under the same working condition. The existing method directly adopts steady-state fuel consumption rate calculation, transient response characteristics are not considered, so that errors exist in fuel consumption calculation, and actual requirements cannot be met. Disclosure of Invention The invention aims to provide a method and a system for calculating fuel consumption of a hybrid electric vehicle based on a transient correction coefficient, and solves the problems that the existing fuel consumption calculation method ignores transient response of an engine and results in low calculation accuracy. The invention solves the technical problems as follows: a method for calculating fuel consumption of a hybrid vehicle based on transient correction coefficients comprises the following steps: constructing a steady-state fuel consumption rate database through bench test; in the simulation process, acquiring the instantaneous rotating speed and the instantaneous torque of the engine at each moment in real time; Calculating the power change rate of the engine according to the instantaneous rotating speed and the instantaneous torque of the engine at adjacent moments; constructing a transient correction coefficient at the current moment based on the engine power change rate; Obtaining a current steady-state fuel consumption rate according to the rotating speed and torque of the engine at the current moment and a steady-state fuel consumption rate database; Obtaining a corrected transient fuel consumption rate according to the current steady-state fuel consumption rate and the transient correction coefficient at the current moment; And (5) accumulating the time of the corrected transient fuel consumption rate, thereby obtaining the final fuel consumption. Further defined, the engine power rate of changeThe method comprises the following steps: Wherein, the The instantaneous engine speed at time t,The instantaneous torque of the engine at the time t,The data acquisition period is a simulation process. Further defined, the transient correction coefficient at the current time is: where a is the load change rate influence coefficient and a is a non-negative number. Further defined, the determination of the load change rate influence coefficient a comprises the steps of: designing a transient test working condition; through bench test, the actual rotation speed of the engine at each moment i is synchronously acquired at high frequency Actual torque of engineInstantaneous fuel consumption measured by high-precision fuel consumption meter; According to the collected actual rotation speed of the engineAnd the actual torque of the engineObtaining the steady-state fuel consumption rate at the corresponding moment through a steady-state fuel consumption rate database; According to steady-state fuel consumption rate at corresponding timeCalculating to obtain steady-state reference fuel consumption at corresponding moment: Wherein, the Engine power at time i; based on instantaneous fuel consumption at the same moment And steady state reference fuel consumptionObtaining transient correction coefficients at corresponding moments: According to the actual rotation speed at adjacent momentsAnd the actual torque