Online fuel-saving method based on gear torque limitation

The invention provides an online fuel-saving method based on gear torque limiting, and relates to the technical field of engine control, and the online fuel-saving method comprises the following steps: S1, inputting a vehicle number; s2, calculating an accumulated mileage; s3, data with poor data quality is removed; s4, generating a working condition distribution diagram; s5, fitting an optimal specific fuel consumption curve; s6, fitting a moving optimal specific fuel consumption curve; s7, generating data; and S8, the user vehicle is remotely upgraded by the OTA. On-line automatic working condition distribution analysis is carried out on engine operation data through a big data intelligent analysis platform algorithm, and optimal personalized calibration parameters are set for a current driver in combination with working condition analysis conditions of drivers of the same model as a platform, so that the optimal limiting torque most suitable for the current driver is output under each gear and rotating spe