Method for estimating automobile quality and road grade by taking parameter coupling relationship into consideration

Abstract

The invention discloses a method for estimating the automobile quality and road grade by taking a parameter coupling relationship into consideration. The method comprises the steps that firstly, automobile state data and automobile inherent parameters are obtained, and an acceleration a at the time of k and a speed changer transmission ratio i<g> is calculated; secondly, an automobile qualitymodel and a road grade model are established; thirdly, a least square quality estimation model and a Kalman filter grade estimation model are constructed based on the automobile quality model and theroad grade model correspondingly; and fourthly, combined estimation of the automobile quality and the road grade is conducted through nested cyclic iteration. According to the method, real-time road grade information and the automobile load situation are provided for an automobile intelligent system, the important basis is provided for automatic driving assisting decision, environment-friendly driving and automatic speed changer gear-shifting control, and thus safe, economical and comfortable driving is realized.

Description

technical field [0001] The invention belongs to the field of intelligent transportation, and in particular relates to a method for estimating vehicle quality and road gradient considering parameter coupling relationship. Background technique [0002] Real-time estimation of vehicle dynamics model parameters is the basis of vehicle control, and vehicle mass and road gradient are important parameters in vehicle dynamics model. Accurate and real-time estimation of vehicle mass and road gradient can effectively improve vehicle dynamics and economy. On-line adjustment of the shift control strategy according to the vehicle quality can not only make the vehicle run more smoothly during the automatic shift process, but also obtain a more economical shift control strategy. Based on information such as road gradient, speed and acceleration, the vehicle power coefficient can be calculated, thereby estimating the engine power required to overcome air resistance and rolling resistance, t...

AI Technical Summary

Problems solved by technology

Although there are many methods in this regard, a common difficulty lies in the decoupling of the vehicle's own parameters (weight, etc.) and external resistance (slope) changes. In addition, the time-varying nature of the road also increases the complexity of the estimation process

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