An engine speed signal isolation branch module

By designing an engine speed signal isolation branch module and employing signal isolation and phase inversion processing techniques, the interference problem in engine speed signal testing was solved, achieving effective signal isolation and preventing degradation, thus improving test reliability and efficiency.

CN224286382UActive Publication Date: 2026-05-26HARBIN DONGAN AUTO ENGINE CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
HARBIN DONGAN AUTO ENGINE CO LTD
Filing Date
2025-05-24
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

The signals from existing engine speed and phase sensors are easily interfered with during testing, leading to signal waveform distortion and degradation, which affects the test results, especially when multiple devices are connected at the same time.

Method used

An engine speed signal isolation branch module was designed, including a signal input unit, a signal isolation unit, a signal inversion unit, a signal output unit, and an isolation power supply unit. It adopts a dual-channel digital signal isolation chip and a power isolation module, and achieves signal isolation and inversion processing through multiplexing to prevent reverse power connection. The reliability is improved by connecting capacitors and resistors.

Benefits of technology

It achieves effective signal isolation, prevents interference and degradation, improves test reliability and work efficiency, has error prevention function and does not require an external power supply.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN224286382U_ABST
    Figure CN224286382U_ABST
Patent Text Reader

Abstract

This utility model provides an engine speed signal isolation and branching module, belonging to the field of engine testing technology. This module solves the problems of signal interference and signal degradation when testing engine speed, phase, and other signals. The module's signal input unit connects the sensor signal terminal to the input terminal of the signal isolation unit. The output terminal of the signal isolation unit connects to the input terminals of the signal inverting unit and the signal output unit. The output terminal of the signal inverting unit connects to the input terminal of the signal output unit, and the output terminal of the signal output unit connects to the input terminal of the testing equipment. The isolation power supply unit converts the sensor power supply into an isolated power supply output. This module has the function of isolating and branching the speed sensor output signal, eliminating signal interference, preventing signal degradation, and simultaneously outputting in-phase and in-phase signals. The module uses a multiplexing method internally for high reliability, and adopts a non-destructive connection method to avoid damaging the wiring harness, thus improving work efficiency.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] This utility model belongs to the field of engine testing technology, and in particular relates to an engine speed signal isolation branch module. Background Technology

[0002] The testing of signals such as engine speed and phase sensors is usually done by directly leading them out in parallel from the engine wiring harness to the test equipment. Since there are many signals being tested on-site, the interconnection between various devices inevitably introduces interference due to issues such as grounding potential differences. Sometimes this can cause severe distortion and degradation of the signal waveform, making testing impossible or even affecting the operation of the engine under test. Moreover, the interference is particularly severe when multiple test devices need to be connected at the same time. Therefore, a component that can reduce signal interference is needed to assist in the testing and detection of engine performance. Summary of the Invention

[0003] To address the problems existing in the background technology, this utility model provides an engine speed signal isolation branch module, which solves the problems of signal interference and signal degradation when testing engine speed, phase and other signals.

[0004] The technical solution adopted by this utility model to solve its technical problem is: an engine speed signal isolation branch module, including a signal input unit, a signal isolation unit, a signal inverting unit, a signal output unit, and an isolation power supply unit. The signal input unit is used to connect the sensor signal terminal and the input terminal of the signal isolation unit. The output terminal of the signal isolation unit is connected to the signal inverting unit and the signal output unit. The input terminal of the signal inverting unit is connected to the output terminal of the signal isolation unit. The output terminal of the signal inverting unit is connected to the input terminal of the signal output unit. The output terminal of the signal output unit is connected to the input terminal of the detection device. The input terminal of the isolation power supply unit is connected to the sensor power supply. The output terminal of the isolation power supply unit is connected to the signal isolation unit and the signal inverting unit.

[0005] The signal access unit includes an IN1 connector, an IN2 connector, and a D1 diode. The IN1 connector is the female terminal of the sensor connector, the IN2 connector is the male terminal of the sensor connector, and the D1 diode is a Schottky diode. One end of the D1 diode is connected to the sensor power supply, and the other end of the D1 diode is connected to both the IN1 and IN2 connectors.

[0006] The signal isolation unit includes an IC1 chip and a D2 diode. The IC1 chip is a dual-channel digital signal isolation chip. The signal is input through pins 2 and 3 of the IC1 chip, and the isolated in-phase signal is output through pins 6 and 7 of the IC1 chip. Pin 1 of the IC1 chip is connected to the sensor power supply, pin 8 of the IC1 chip is connected to the isolation power supply, pin 4 of the IC1 chip is connected to GND1 ground, and pin 5 of the IC1 chip is connected to GND2 ground. One end of the D2 diode is connected to pins 2 and 3 of the IC1 chip, and the other end of the D2 diode is connected to GND1 ground.

[0007] The signal inverting unit includes an IC2 chip and a D3LED. The IC2 chip is a dual-channel inverting chip. The signal is input from pins 1 and 3 of the IC2 chip, and the inverted signal is output from pins 4 and 6 of the IC2 chip. Pin 2 of the IC2 chip is connected to GND2 ground, and pin 5 of the IC2 chip is connected to an isolation power supply. One end of the D3LED is connected to pin 6 of the IC2 chip, and the other end of the D3LED is connected to GND2 ground.

[0008] The signal output unit includes an OUT1 connector and an OUT2 connector. Pin 1 of the OUT1 connector is connected to pin 7 of the IC1 chip and pin 1 of the IC2 chip. Pin 1 of the OUT2 connector is connected to pin 6 of the IC1 chip and pin 3 of the IC2 chip.

[0009] The isolated power supply unit includes a P1 module and a D4LED. The P1 module is a 5V to 5V power isolation module. Pin 1 of the P1 module is an input pin connected to the output terminal of the sensor power supply. Pin 6 of the P1 module is an output pin connected to pin 8 of the IC1 chip and pin 5 of the IC2 chip. The P1 module provides isolated power to the IC1 and IC2 chips after isolating and converting the sensor power supply. Pin 2 of the P1 module is connected to GND1 ground, and pin 4 of the P1 module is connected to GND2 ground. One end of the D4LED is connected to pin 1 of the P1 module, and the other end of the D4LED is connected to GND1 ground, which is used to detect the correctness of the power connection.

[0010] The engine speed signal isolation branch module also includes capacitors C1, C2, C3, C4, and C5. Capacitor C1 is connected in parallel between pins 1 and 2 of module P1, capacitor C2 is connected in parallel between pins 4 and 6 of module P1, one end of capacitor C3 is connected to pin 1 of IC1 chip, and the other end is connected to GND1 ground, one end of capacitor C4 is connected to pin 8 of IC1 chip, and the other end is connected to GND2 ground, and one end of capacitor C5 is connected to pin 5 of IC2 chip, and the other end is connected to GND2 ground. All capacitors C1, C2, C3, C4, and C5 are non-polarized capacitors.

[0011] The engine speed signal isolation branch module also includes resistors R1, R2, R3, and R4. Resistor R1 is connected in series between pin 2 of the D1 diode and the IN1 connector and pin 2 of the IN2 connector. Resistor R2 is connected in series between pin 4 of the IC2 chip and GND2. Resistor R3 is connected in series between pin 6 of the IC2 chip and D3LED. Resistor R4 is connected in series between pin 1 of the P1 module and D4LED.

[0012] The beneficial effects of this utility model are:

[0013] 1. This isolation branch module can isolate and branch the output signal of the speed sensor, thereby eliminating signal interference and preventing signal degradation.

[0014] 2. The isolation branch module uses multiplexing internally, which improves reliability;

[0015] 3. This isolation branch module uses a male and female sensor connector to connect the power and signal modules in a non-destructive manner, avoiding damage to the wiring harness and improving work efficiency.

[0016] 4. The power supply of this isolation branch module is directly taken from the power supply of the speed sensor itself, and no additional power supply is required;

[0017] 5. This isolation branch module has reverse power connection protection and correct power connection indication functions, which have error prevention functions and improve reliability;

[0018] 6. This isolation branch module has the function of outputting both in-phase and out-of-phase signals. Attached Figure Description

[0019] In the attached diagram:

[0020] Figure 1 This is a schematic diagram of the circuit connection layout of this utility model; Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0022] An engine speed signal isolation branch module includes a signal input unit, a signal isolation unit, a signal inverting unit, a signal output unit, and an isolation power supply unit. The signal input unit connects the sensor signal terminal to the input terminal of the signal isolation unit. The output terminal of the signal isolation unit connects the signal inverting unit and the signal output unit. The signal isolation unit receives and processes the sensor signal and transmits the processed in-phase signal to the signal inverting unit and the signal output unit. The input terminal of the signal inverting unit is connected to the output terminal of the signal isolation unit, and the output terminal of the signal inverting unit is connected to the input terminal of the signal output unit. The signal inverting unit processes the in-phase signal from the signal isolation unit into an inverted signal and transmits it to the signal output unit. The output terminal of the signal output unit is connected to the input terminal of a detection device. The signal output unit outputs the in-phase signal and the inverted signal to the detection device for detection and processing. The input terminal of the isolation power supply unit is connected to the sensor power supply, and the output terminal of the isolation power supply unit is connected to the signal isolation unit and the signal inverting unit. The isolation power supply unit isolates and converts the sensor power supply output to power the signal isolation unit and the signal inverting unit.

[0023] The signal access unit includes an IN1 connector, an IN2 connector, and a D1 diode. The IN1 connector is the female terminal of the sensor connector, the IN2 connector is the male terminal of the sensor connector, and the D1 diode is a Schottky diode. One end of the D1 diode is connected to the sensor power supply, and the other end of the D1 diode is connected to both the IN1 and IN2 connectors. The two ends of the sensor connector are respectively connected to the IN1 and IN2 connectors to realize the data transmission connection between the sensor and this isolation branch module. The D1 diode is set to provide reverse connection protection for the power supply.

[0024] The IN1 and IN2 connectors are respectively connected to the speed sensor and the original sensor connector. Through male and female adapters, power and signal input to the module are achieved, avoiding damage to the wiring harness and improving work efficiency.

[0025] The signal isolation unit includes an IC1 chip and a D2 diode. The IC1 chip is a dual-channel digital signal isolation chip. The signal is input through pins 2 and 3 of the IC1 chip, and the isolated in-phase signal is output through pins 6 and 7 of the IC1 chip. Pin 1 of the IC1 chip is connected to the sensor power supply, pin 8 of the IC1 chip is connected to the isolation power supply, pin 4 of the IC1 chip is connected to GND1 ground, and pin 5 of the IC1 chip is connected to GND2 ground. One end of the D2 diode is connected to pins 2 and 3 of the IC1 chip, and the other end of the D2 diode is connected to GND1 ground. The D2 diode is a TVS diode, used to protect electronic circuits and prevent surge pulses from damaging components in the circuit.

[0026] The signal inverting unit includes an IC2 chip and a D3LED. The IC2 chip is a dual-channel inverting chip. The signal is input through pins 1 and 3 of the IC2 chip, and the inverted signal is output through pins 4 and 6 of the IC2 chip. Pin 2 of the IC2 chip is connected to GND2 ground, and pin 5 of the IC2 chip is connected to an isolation power supply. One end of the D3LED is connected to pin 6 of the IC2 chip, and the other end of the D3LED is connected to GND2 ground. The D3LED is used for signal indication. When there is a signal output, the D3LED flashes. The D3LED can also be used to determine whether the circuit is working properly during debugging.

[0027] The signal output unit includes an OUT1 connector and an OUT2 connector. Pin 1 of the OUT1 connector is connected to pin 7 of the IC1 chip and pin 1 of the IC2 chip. Pin 1 of the OUT2 connector is connected to pin 6 of the IC1 chip and pin 3 of the IC2 chip. The in-phase signal processed by the IC1 chip and the inverted signal processed by the IC2 chip are transmitted to the detection device through the OUT1 connector and the OUT2 connector.

[0028] The isolated power supply unit includes a P1 module and a D4LED. The P1 module is a 5V to 5V power isolation module. Pin 1 of the P1 module is an input pin connected to the output terminal of the sensor power supply. Pin 6 of the P1 module is an output pin connected to pin 8 of the IC1 chip and pin 5 of the IC2 chip. The P1 module provides isolated power to the IC1 and IC2 chips after isolating and converting the sensor power supply. Pin 2 of the P1 module is connected to GND1 ground, and pin 4 of the P1 module is connected to GND2 ground. One end of the D4LED is connected to pin 1 of the P1 module, and the other end of the D4LED is connected to GND1 ground. It is used to detect the correctness of the power connection. If the isolated power supply unit is connected correctly, the D4LED lights up; if the isolated power supply unit is connected incorrectly, the D4LED remains off.

[0029] The engine speed signal isolation branch module also includes capacitors C1, C2, C3, C4, and C5. Capacitor C1 is connected in parallel between pins 1 and 2 of module P1, capacitor C2 is connected in parallel between pins 4 and 6 of module P1, one end of capacitor C3 is connected to pin 1 of IC1 chip, and the other end is connected to GND1 ground, one end of capacitor C4 is connected to pin 8 of IC1 chip, and the other end is connected to GND2 ground, and one end of capacitor C5 is connected to pin 5 of IC2 chip, and the other end is connected to GND2 ground. All capacitors C1, C2, C3, C4, and C5 are non-polarized capacitors.

[0030] The engine speed signal isolation branch module also includes resistors R1, R2, R3, and R4. Resistor R1 is connected in series between pin 2 of the D1 diode and the IN1 connector and pin 2 of the IN2 connector. Resistor R2 is connected in series between pin 4 of the IC2 chip and GND2. Resistor R3 is connected in series between pin 6 of the IC2 chip and D3LED. Resistor R4 is connected in series between pin 1 of the P1 module and D4LED.

[0031] This isolation branch module uses multiplexing to improve reliability. The specific connection relationship is as follows:

[0032] Pin 3 of the IN1 connector, pin 3 of the IN2 connector, and pin 4 of the IC1 chip are all connected to GND1 ground.

[0033] Pins 2 of the IN1 connector and pins 2 of the IN2 connector are connected together and connected to one end of resistor R1;

[0034] Pin 1 of connector IN1, pin 1 of connector IN2, the positive terminal of diode D1, pin 2 of chip IC1, pin 3 of chip IC1, and the negative terminal of diode D2 are all connected to the other end of resistor R1.

[0035] The positive terminal of diode D2 is connected to ground GND1;

[0036] The negative terminal of diode D1, pin 1 of IC1 chip, one pin of capacitor C1, one end of resistor R1, one pin of capacitor C3, and pin 1 of module P1 are all connected to the sensor power supply (+5V1).

[0037] Pin 2 of module P1, the other pin of capacitor C1, the other pin of capacitor C3, and the negative terminal of LED D4 are connected in parallel to ground GND1.

[0038] The other end of resistor R1 is connected to the positive terminal of LED D4;

[0039] Pin 6 of module P1, one pin of capacitor C2, one pin of capacitor C4, pin 8 of IC1 chip, pin 5 of IC2 chip, and one pin of capacitor C5 are connected in parallel to the isolation power supply (+5V2).

[0040] Pin 4 of module P1, another pin of capacitor C2, another pin of capacitor C4, pin 5 of IC1 chip, pin 2 of IC2 chip, the negative terminal of LED D3, and another pin of capacitor C5 are connected in parallel to GND2 ground.

[0041] Pin 7 of IC1 chip, pin 1 of IC2 chip, and pin 1 of OUT1 connector are connected in parallel.

[0042] Pin 6 of IC1 chip, pin 3 of IC2 chip, and pin 1 of OUT2 connector are connected in parallel.

[0043] Pin 6 of IC2 chip, pin 2 of OUT1 connector, and one end of resistor R3 are connected in parallel.

[0044] The other end of resistor R3 is connected to the positive terminal of LED D3;

[0045] Pin 4 of IC2 chip, pin 2 of OUT2 connector, and one end of resistor R2 are connected in parallel.

[0046] Pin 3 of connector OUT1, pin 3 of connector OUT2, and the other end of resistor R2 are connected in parallel to ground GND2.

[0047] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An engine speed signal isolation branch module, characterized by: It includes a signal input unit, a signal isolation unit, a signal inverting unit, a signal output unit, and an isolation power supply unit. The signal input unit is used to connect the sensor signal terminal to the input terminal of the signal isolation unit. The output terminal of the signal isolation unit is connected to the signal inverting unit and the signal output unit. The input terminal of the signal inverting unit is connected to the output terminal of the signal isolation unit. The output terminal of the signal inverting unit is connected to the input terminal of the signal output unit. The output terminal of the signal output unit is connected to the input terminal of the detection device. The input terminal of the isolation power supply unit is connected to the sensor power supply. The output terminal of the isolation power supply unit is connected to the signal isolation unit and the signal inverting unit.

2. An engine speed signal isolation branch module according to claim 1, characterized in that: The signal access unit includes an IN1 connector, an IN2 connector, and a D1 diode. The IN1 connector is the female terminal of the sensor connector, the IN2 connector is the male terminal of the sensor connector, and the D1 diode is a Schottky diode. One end of the D1 diode is connected to the sensor power supply, and the other end of the D1 diode is connected to both the IN1 and IN2 connectors.

3. An engine speed signal isolation branch module according to claim 2, characterised in that: The signal isolation unit includes an IC1 chip and a D2 diode. The IC1 chip is a dual-channel digital signal isolation chip. The signal is input through pins 2 and 3 of the IC1 chip, and the isolated in-phase signal is output through pins 6 and 7 of the IC1 chip. Pin 1 of the IC1 chip is connected to the sensor power supply, pin 8 of the IC1 chip is connected to the isolation power supply, pin 4 of the IC1 chip is connected to GND1 ground, and pin 5 of the IC1 chip is connected to GND2 ground. One end of the D2 diode is connected to pins 2 and 3 of the IC1 chip, and the other end of the D2 diode is connected to GND1 ground.

4. An engine speed signal isolation branch module according to claim 3, characterised in that: The signal inverting unit includes an IC2 chip and a D3LED. The IC2 chip is a dual-channel inverting chip. The signal is input from pins 1 and 3 of the IC2 chip, and the inverted signal is output from pins 4 and 6 of the IC2 chip. Pin 2 of the IC2 chip is connected to GND2 ground, and pin 5 of the IC2 chip is connected to an isolation power supply. One end of the D3LED is connected to pin 6 of the IC2 chip, and the other end of the D3LED is connected to GND2 ground.

5. An engine speed signal isolation branch module according to claim 4, characterised in that: The signal output unit includes an OUT1 connector and an OUT2 connector. Pin 1 of the OUT1 connector is connected to pin 7 of the IC1 chip and pin 1 of the IC2 chip. Pin 1 of the OUT2 connector is connected to pin 6 of the IC1 chip and pin 3 of the IC2 chip.

6. An engine speed signal isolation branch module according to claim 5, characterised in that: The isolated power supply unit includes a P1 module and a D4LED. The P1 module is a 5V to 5V power isolation module. Pin 1 of the P1 module is an input pin connected to the output terminal of the sensor power supply. Pin 6 of the P1 module is an output pin connected to pin 8 of the IC1 chip and pin 5 of the IC2 chip. The P1 module provides isolated power to the IC1 and IC2 chips after isolating and converting the sensor power supply. Pin 2 of the P1 module is connected to GND1 ground, and pin 4 of the P1 module is connected to GND2 ground. One end of the D4LED is connected to pin 1 of the P1 module, and the other end of the D4LED is connected to GND1 ground, which is used to detect the correctness of the power connection.

7. An engine speed signal isolation branch module according to claim 6, characterised in that: The engine speed signal isolation branch module also includes capacitors C1, C2, C3, C4, and C5. The C1 capacitor is connected in parallel between pins 1 and 2 of the P1 module. The C2 capacitor is connected in parallel between pins 4 and 6 of the P1 module. One end of capacitor C3 is connected to pin 1 of chip IC1, and the other end is connected to ground GND1. One end of capacitor C4 is connected to pin 8 of chip IC1, and the other end is connected to ground GND2. One end of capacitor C5 is connected to pin 5 of chip IC2, and the other end is connected to ground GND2. The capacitors C1, C2, C3, C4, and C5 are all non-polarized capacitors.

8. The engine speed signal isolation branch module according to claim 7, characterized in that: The engine speed signal isolation branch module also includes resistors R1, R2, R3, and R4. The resistor R1 is connected in series between pin 2 of the diode D1 connector and pin 2 of the IN1 connector, and pin 2 of the IN2 connector. The resistor R2 is connected in series between pin 4 of the IC2 chip and GND2 ground. The R3 resistor is connected in series between pin 6 of the IC2 chip and the D3LED. The R4 resistor is connected in series between pin 1 of the P1 module and the D4LED.