Driving torque optimization control method of pure electric vehicle

Abstract

A driving torque optimization control method of a pure electric vehicle comprises the steps of obtaining the energy consumption condition of high-voltage accessories of a whole vehicle system, and obtaining the current sum Iacc of the high-voltage accessories; obtaining the maximum output current Ibatt_max and the current battery total voltage Vbatt of the battery system under the current workingcondition, removing the high-voltage accessory current from the maximum output current of the battery, and considering the battery efficiency eta batt to obtain the current battery maximum output power Pbatt_max; obtaining the current motor rotating speed nrec and the opening degree theta thr of a driving pedal, and obtaining the current required torque Treq through calculation according to the current battery maximum output power Pbatt_max; obtaining efficiency MAP data of a driving motor, introducing the current motor rotating speed nrec and the calculated required torque Treq into the efficiency MAP data, and obtaining the current motor efficiency eta motor; considering the motor efficiency eta motor, and calculating the current required power Pmotorreq of the motor; and for the motor efficiency MAP data, solving the torque of the highest motor efficiency at different rotating speeds, and fitting the optimal efficiency point in the motor efficiency MAP graph into an optimal efficiency curve.

Description

Technical field: [0001] The invention relates to a driving torque optimization control method of a pure electric vehicle, which belongs to the technical field of torque control of new energy vehicles. Background technique: [0002] A pure electric vehicle is a new type of vehicle that uses a power battery as the sole energy source and an on-board motor as the sole drive. Compared with traditional fuel vehicles and hybrid vehicles, pure electric vehicles have a more streamlined chassis structure, more impressive energy efficiency and cleaner energy sources. support. The torque control of electric vehicles is one of the cores of its control system, which is directly related to the reasonable distribution of power battery energy and the driver's driving experience. [0003] At present, the torque control in engineering applications is mostly based on the discharge capacity of the battery, combined with the opening of the drive pedal to calculate the current demand torque, wit...

AI Technical Summary

Problems solved by technology

[0003] At present, torque control in engineering applications is mostly based on the discharge capacity of the battery, combined with the opening of the drive pedal to calculate the current demand torque, without fully considering the impact of motor efficiency on the load at the battery end

In fact, when the electric vehicle is in the rapid acceleration or climbing condition with low-speed and high-torque output, the efficiency of the motor is relatively low. If it continues to request torque exceeding the output capacity of the battery, it will inevitably lead to overcurrent of the power battery and cause irreversible damage, and even lead to safety accidents

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