Engine Test Apparatus Torque Feedback Control
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Solution Overview
Problem
Conventional engine test apparatuses experience significant deviations between target and actual rotational frequencies, especially under transient conditions, requiring time-consuming and labor-intensive optimization of PI control conditions to enhance accuracy.
Innovation Solution
An engine test apparatus that includes a dynamometer, a torque meter, and a control device which computes a correction torque command value by subtracting the measured torque value from the torque command value, using rotational frequency feedback to apply feedback control, thereby reducing errors and improving test accuracy without requiring inertia values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional feedback control is used to control the dynamometer, then the system is simple to operate, but the deviation between target and actual rotational frequency becomes large under transient conditions
Solution Approach 1:
The patent applies feedback control by using the torque meter measurement to compute a correction value that is fed back to the dynamometer control. The control device computes a torque command value based on rotational frequency feedback and subtracts the measured torque from it to generate a correction torque command value, which is then applied to the dynamometer. This feedback mechanism reduces the deviation between target and actual rotational frequency while maintaining system simplicity.
2Measurement precision
If PI control conditions are optimized through repeated trials and errors, then test accuracy improves, but the time and effort required for setup increases significantly
Solution Approach 1:
The system performs self-adjustment by automatically computing the correction torque command value based on real-time torque measurements from the torque meter. The control device uses the measured torque value to self-correct the torque command without requiring manual optimization of PI control parameters through repeated trials and errors. This self-service mechanism eliminates time-consuming setup procedures while maintaining high test accuracy.
3Measurement precision
If the dynamometer is controlled using only rotational frequency feedback, then the control system remains simple, but it cannot sufficiently improve accuracy under transient conditions
Solution Approach 1:
The patent merges rotational frequency feedback control with torque measurement feedback. The control device combines the torque command value (based on rotational frequency feedback) with the measured torque value from the torque meter to generate a correction torque command value. This merging of two feedback sources (rotational frequency and torque) improves transient condition accuracy while maintaining operational simplicity through automated computation.
Data Source
AI summary
To provide an engine test apparatus and method, which can easily enhance the test accuracy.The engine test apparatus 10 of the present invention includes: a dynamometer 14, which applies torque to an output shaft of an engine 12 via a shaft member 32; a torque meter 36, which is disposed on the shaft member 32 and measures torque; and a control device 20, which computes a torque command value using a rotational frequency feedback value in order to apply feedback control based on a rotational frequency to the dynamometer 14. The control device 20 subtracts a value measured by the torque meter 14 from the torque command value to find a correction torque command value and controls the dynamometer 14 using the correction torque command value.