Vehicle calibration method and system

Abstract

The invention discloses a vehicle calibration method and system. The method comprises the steps: inputting a shifting strategy mapping table and an accelerator pedal curve mapping table into a vehiclesimulation model; selecting a plurality of accelerator fixed values from the accelerator pedal curve mapping table, and carrying out the fixed acceleration simulation according to the plurality of accelerator fixed values through a simulation model; selecting a vehicle speed and a corresponding acceleration from a simulation result, and drawing a fixed acceleration waterfall plot according to theselected vehicle speed and the corresponding acceleration; and optimizing a torque in an accelerator pedal curve under the corresponding accelerator value and a shifting point in the shifting strategy mapping table according to the acceleration waterfall plot. According to the invention, the method can achieve the fixed acceleration simulation through the model, can achieve the quick and efficient searching of the most ideal shifting point, improves the efficiency, reduces the independence on a real-vehicle test, saves the development cost of a vehicle, and reduces the test risks.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a vehicle calibration method and system. Background technique [0002] Calibration of the engine accelerator pedal curve and gear shift strategy The focus of the calibration of automatic transmission vehicles, one of the main calibration methods is to set the acceleration of the accelerator pedal. The accelerator pedal curve of the engine controls the torque of the engine at different speeds under different accelerators. The torque emitted by the engine is the power source of the entire vehicle transmission chain, and the shift strategy of the automatic transmission controls the gear position and hydraulic torque under different accelerators and vehicle speeds. Gearbox opening and closing or slipping, different gears and the opening and closing of the hydraulic torque converter affect the transmission ratio, torque transmission ratio and efficiency of the gearbox. The formul...

AI Technical Summary

Problems solved by technology

[0003] In related technologies, the matching relationship between the engine accelerator pedal curve and the automatic transmission shift strategy is obtained through real vehicle testing. However, real vehicle testing is risky and has high requirements for vehicles, data acquisition systems and data accuracy

There are the following disadvantages: there must be a prototype vehicle, but the state of the prototype vehicle will also affect the calibration results

It is necessary to rely on personal experience to find the ideal vehicle speed through a test-by-test method. The workload is large, the efficiency is low, and the cost is high.

Experimental error has a great influence on the analysis of comparative results

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