Rotating speed simulation device based on phase of vehicle engine

Abstract

The invention discloses a rotating speed simulation device based on a phase of a vehicle engine. The rotating speed simulation device comprises a bracket, a crankshaft signal acquisition mechanism, a cam shaft signal acquisition mechanism and a transmission mechanism, wherein the bracket comprises an upper-layer plate and a lower-layer plate; the crankshaft signal acquisition mechanism comprises a simulation crankshaft, a crankshaft signal disk and a crankshaft rotating speed sensor; the crankshaft signal disk is mounted at the upper end of the simulation crankshaft; the cam shaft signal acquisition mechanism comprises a simulation cam shaft, a cam shaft signal disk and a cam shaft rotating speed sensor; the cam shaft signal disk is mounted at the upper end of the simulation cam shaft; the simulation crankshaft and the simulation cam shaft are vertically arranged between the upper-layer plate and the lower-layer plate side by side; the transmission mechanism is movably arranged on the lower-layer plate and comprises a driving shaft; the driving shaft is vertically arranged on one side between the upper-layer plate and the lower-layer plate and drives the simulation crankshaft and the simulation cam shaft to rotate through a synchronous belt. The rotating speed simulation device accurately simulates a rotating speed signal of the engine, and is compact in structure, low in cost and convenient to carry.

Description

technical field [0001] The invention relates to the technical field of vehicle engine control testing, in particular to a device capable of simulating engine phase and rotational speed used in testing. Background technique [0002] With the increasing shortage of oil resources and stricter emission regulations, the research and application of engine electronic control technology has been widely valued. The development and testing of engine control unit ECU software and hardware is a key link in the development of engine electronic control technology. It is the basic condition to carry out this work to accurately simulate the engine phase and speed signals. In addition, in the fields of fault simulation, diagnosis and maintenance of the engine electronic control system, it is also necessary to input phase and speed signals to the ECU. Among them, the rotational speed signal is one of the most important parameters reflecting the working condition of the engine, and it is the ...

AI Technical Summary

Problems solved by technology

[0003] In order to conveniently and cost-effectively provide the speed signal required for the development of the controller, technicians usually use a pulse circuit generator to simulate the engine speed signal, but this circuit is difficult to simulate the unique phase relationship between the engine crankshaft and camshaft, and the circuit signal Susceptible to electromagnetic interference, there are certain differences with the waveform of the speed signal output by the real engine sensor

In order to simulate the phase and speed signals of the engine, some technicians use single-chip microcomputer technology to output relevant speed and phase signals at the same time, but these signals are either square wave signals or sine wave signals through simple shaping. These signals generally cannot be compared with The speed signal conditioning circuit of the ECU is compatible, and can only be directly connected to the single-chip port in the ECU, which brings great difficulties to the application, especially not suitable for the test and diagnosis of the product ECU, let alone the field test

There are also technicians who use the servo motor to drive the signal wheel to generate the typical output signal of the crankshaft (such as the signal of 60-2). The ability to have the phase relationship with the camshaft, or have the above-mentioned ability but have the problems of slow speed measurement and huge equipment structure

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