Parameter setting method for PID adjustment of torque of engine discharging test

A parameter setting and engine technology, applied in the direction of electric controllers, controllers with specific characteristics, etc., can solve problems such as increasing test costs, and achieve the effects of effective adjustment methods, good test repeatability, and increased system stability.

Inactive Publication Date: 2019-01-15
XIANGYANG DAAN AUTOMOBILE TEST CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Repeated cold WHTC cycle and hot WHTC cycle test will undoubtedly increase the test cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] The present invention will be further described in two parts by the following examples.

[0011] In the first part, the basic principle of PID control is described.

[0012] PID: proportional (proportion), integral (integration), differential (differentiation) controller (proportional-integral-differential controller) is a common feedback loop component in industrial control applications, consisting of proportional unit P, integral unit I and The differential unit D is composed. The relationship between its input e (t) and output u (t) is:

[0013] u(t)=kp[e(t)+1 / TI∫e(t)dt+TD*de(t) / dt]

[0014] In the formula, the upper and lower limits of the integral are 0 and t respectively, so its transfer function is:

[0015] G(s)=U(s) / E(s)=kp[1+1 / (TI*s)+TD*s]

[0016] Among them, kp is the proportional coefficient; TI is the integral time constant; TD is the differential time constant.

[0017] The output of proportional control is proportional to the input error signal. Wh...

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Abstract

The invention relates to a parameter setting method for PID adjustment of a torque of an engine discharging test. According to the parameter setting method, parameters of a proportion unit P, an integral unit I and an accelerator speed D are set; the proportion unit P is set to be 0.10-0.30, the system response can be accelerated with increase, the static difference is reduced, relatively large overshot and oscillation can be generated if the proportion unit P is excessively large, and the stability becomes worse; in the integral unit I, the instantaneous experiment integral I is set to be 10-30, the overshoot and the oscillation can be reduced by increasing the integral, and the stability is improved; and the steady-state experiment integral I is set to be 2-10, the response speed is improved by shortening the integral time, the static difference elimination time is shortened, the oscillation can be improved when the steady-state experiment integral I is excessively small, and the system stability becomes poor. The accelerator change speed needs to conform to the experiment requirement, the accelerator changing speed is set to be 50-100% during instantaneous experiment, and the accelerator changing speed is set to be 10-20% during steady-state experiment. The parameter setting method has the advantages of parameter setting reasonableness, adjustment method effectiveness, goodexperiment repeatability and high detection efficiency.

Description

technical field [0001] The invention relates to an automobile engine bench test technology, in particular to a parameter setting method for engine emission test torque PID adjustment. Background technique [0002] In order to adapt to the upgrade of vehicle pollutant emission standards, the WHTC (World Harmonized Transient Cycle) cycle and WHSC (World Harmonized Steady Cycle) test were introduced into the national six-stage emission regulations for heavy-duty diesel engines. The WHTC cycle is a transient cycle condition, and the WHSC The cycle is a steady state cycle condition. When the two test cycles are running, there are high requirements for the rapid response of the engine speed and torque. After the test is completed, a regression analysis between the reference value and the actual value of the speed, torque, and power is required. The regression analysis must meet the corresponding limit requirements. . At the same time, a complete WHTC cycle includes a cold WHTC c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B11/42
CPCG05B11/42
Inventor 程建康张斌肖红军郑巍刘小舫汪侃刘尧武朴世文刘金宽刘纯
Owner XIANGYANG DAAN AUTOMOBILE TEST CENT
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