Whole vehicle mass estimation method and torque control method and device

Abstract

The invention provides a whole vehicle mass estimation method and a torque control method and device, which belong to the technical field of vehicle control. The whole vehicle mass estimation method comprises the steps that when a vehicle is in a neutral gear, a first acceleration is acquired; when the vehicle is in the gear, a second acceleration and a corresponding driving torque are obtained; avector sum of the first acceleration and the second acceleration is taken as an actual acceleration, and a longitudinal kinetic equation of the whole vehicle is constructed; and iterative computationis carried out on the longitudinal kinetic equation of the whole vehicle by using a recursive least square method, and the mass of the whole vehicle is obtained through estimation. When the method isused for estimating the mass of the whole vehicle, the influence of factors such as rolling resistance, air resistance, acceleration resistance and ramp resistance on the estimation of the mass of the whole vehicle is fully considered, the consideration is comprehensive, and the estimated mass of the whole vehicle is more accurate.

Description

Technical field [0001] The invention relates to a vehicle quality estimation method, a torque control method and a device, and belongs to the technical field of vehicle control. Background technique [0002] In recent years, in response to the increasingly severe environmental pollution and energy crisis, major automobile manufacturers have begun to develop new energy vehicles with high energy efficiency and low emissions. Pure electric vehicles, as a kind of new energy vehicles, are driven by electric motors, eliminating the engine. At the same time, the characteristics of the electric motors allow the electric motors to be controlled to operate as engines, that is, during the driving of the vehicle, the electric motor can issue a driving torque to drive the vehicle to accelerate; During the braking process, braking deceleration can be achieved through the motor reverse drag torque. [0003] Although pure electric vehicles can use the motor to drive and brake to control the speed...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for estimating the mass of a vehicle to solve the problem of inaccurate estimation results caused by ignoring relevant items in the process of estimating the mass of a vehicle in the existing estimating method of vehicle mass; the present invention also provides a torque control The method is used to solve the problem that when the torque output is adjusted according to the vehicle mass estimated by the existing vehicle mass estimation method, the torque output does not meet the actual demand due to the inaccurate estimation of the vehicle mass, which affects the comfort and reliability of the vehicle The present invention also provides a torque control device, which is used to solve the problem that when the torque output is adjusted according to the vehicle mass estimated by the existing vehicle mass estimation method, the torque output does not conform to the reality due to the inaccurate estimation of the vehicle mass Demand, issues affecting the comfort and reliability of the vehicle

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