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Method for estimating indicating torque of engine based on nonsingular terminal sliding mode observer

A non-singular terminal and sliding mode observer technology, which is applied in the direction of instruments, adaptive control, control/regulation systems, etc., can solve the problems of the convergence time to be improved, and achieve the effect of improving accuracy

Active Publication Date: 2017-05-10
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

The input estimation problem is transformed into a control tracking problem; literature [12] uses a sliding mode observer to estimate the dynamic torque, that is, the difference between the indicated torque and the load torque, which can avoid the acquisition of the load torque, and use the sliding mode observer The estimation robustness of is better, but the convergence time needs to be improved

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  • Method for estimating indicating torque of engine based on nonsingular terminal sliding mode observer
  • Method for estimating indicating torque of engine based on nonsingular terminal sliding mode observer
  • Method for estimating indicating torque of engine based on nonsingular terminal sliding mode observer

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with accompanying drawing.

[0035] The indicated torque estimation method based on the non-singular terminal sliding mode observer of the present invention, by changing the estimated value of the indicated torque Estimated value of forced crankshaft angular velocity Track the actual changing measurement ω. In the sliding mode process, the estimation error of the angular velocity of the crankshaft Gradually shrink to ensure the convergence of the system. Using Lyapunov stability theorem combined with sliding mode control to select the appropriate injection signal, system chattering is avoided and steady-state error is eliminated.

[0036] see figure 2 , an engine indicated torque estimation method based on a non-singular terminal sliding mode observer, including the following steps:

[0037] Obtain the real-time changing crankshaft angle θ of the engine, as well as the instantaneous engine spe...

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Abstract

The invention discloses a method for estimating an indicating torque of an engine based on a nonsingular terminal sliding mode observer. The method comprises the following steps of: establishing an accurate nonlinear engine crankshaft dynamical model; performing real-time measurement on crankshaft angle and engine speed, taking as an observer input and performing differential operation; and utilizing the nonsingular terminal sliding mode observer to change an estimating value of the indicating torque, thereby causing the estimating value of the crankshaft angular velocity gradually approach to the constantly changing practical measurement value. According to the method disclosed by the invention, the nonsingular terminal sliding mode observer is utilized to online estimate the indicating torque of the engine, has excellent robustness to the modeling error and the parameter perturbation, is short in convergence time and is high in estimating precision. According to the method disclosed by the invention, the estimating precision of the indicating torque is guaranteed.

Description

technical field [0001] The invention belongs to a method for estimating indicated torque of an automobile engine, in particular to an estimating method for indicated torque of an engine based on a non-singular terminal sliding mode observer (NTSMO). Background technique [0002] Indicated torque is an important parameter of engine power performance. Real-time and reliable acquisition of indicated torque can not only correctly evaluate engine performance, monitor faults in real time, but also implement relevant strategies for optimal control of the engine and transmission. In the case of changes in speed and load, it can effectively improve the fuel economy, driving comfort and car safety of the car. In addition, since the indicated torque of the engine cannot be obtained directly, the indicated torque can be calculated by installing the cylinder pressure sensor to obtain the cylinder pressure, but this method is limited in practical application. Therefore, how to indirectly...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 郑太雄周铜林杨斌杨新琴
Owner CHONGQING UNIV OF POSTS & TELECOMM
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