Automatic tester for valve lift and timing phase of engine

Abstract

The invention provides an automatic tester for valve lift and timing phase of an engine, consisting of a laser displacement sensor, a photoelectric encoder, a digital signal processor and a display computer, as shown in Figure 1. A newly-designed local raster area of the photoelectric encoder triggers a pulse signal to realize the work timing sequence for time-share data collecting and data processing for the digital signal processor. The integrated laser displacement sensor directly outputs voltage quantity, so that a signal converting circuit of the tester is reduced. The single-channel analog to digital converter (ADC) 200K acquisition accuracy and the instruction execution speed 400 billion instructions / S MIPS (million instructions per second) of the digital signal processor can realize the high-speed acquisition of the valve lift and the complex data process. A double-data communication mode of asynchronous serial communication interface (SCI) and high speed data transmission universal serial bus (USB) is used in a multi-parameter transmission monitor mode and a single-parameter multi-data transmission test mode respectively. After the laser displacement sensor and digital signal processor-based automatic tester for valve lift and timing phase is used, the automatic test and the data process of the valve lift and the timing phase can be completed.

Description

1. Technical field [0001] The invention relates to an engine valve displacement test device, in particular to an automatic tester for valve lift and valve timing, belonging to the technical field of engine test technology and engine test. 2. Background technology [0002] The valve lift is one of the important indicators that affect the intake air volume of the engine. The valve timing directly determines the dynamic performance of the engine. The valve lift and valve timing tests are all statically measured before the engine starts. During the operation of the engine, due to the difference in mechanical wear and lubrication quality, there are differences in the actual working state of the valve compared with the static state, resulting in changes in the valve lift and valve timing. With the improvement of engine performance requirements and control accuracy, dynamic measurement of valve lift and valve timing, monitoring of engine air intake and intake and exhaust timing are...

AI Technical Summary

Problems solved by technology

[0004] Although the current electronic control valve device of the engine realizes the control of the valve movement, this control is an open-loop control, which cannot be corrected by measuring the valve displacement in real time. It is the main means of gas volume, and it is also one of the means for the engine to maintain performance indicators in different environments. The adaptive control of valve lift has higher requirements for real-time measurement of valve lift, and automatic testing of valve lift and valve timing is essential.

[0005] Conventional valve lift and valve timing automatic tester is composed of piezoelectric displacement sensor, acquisition card and computer, including valve lift, valve timing data collection and data off-line analysis, this tester has many accessories and is relatively small Large, it is difficult to meet the dynamic requirements of the engine in terms of system volume and configuration

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