Multi-node control system

Abstract

The invention provides a multi-node control system which is suitable for an electronic control unit (ECU) to control multiple physical nodes. The multi-node control system comprises the ECU and at least one physical node. The ECU and each physical node are connected through two wires. The ECU sends out mixed signals which are formed in a modulation mode by working voltage and control signals which control the physical nodes. IDs of corresponding physical nodes are carried in the control signals. The physical nodes demodulate the received mixed signals to be the control signals and the working voltage. The working voltage supplies power to the physical nodes selves. The control signals carrying self IDs are analyzed and processed. Self-status information is enabled to generate feedback signals. The feedback signals are modulated to wires and fed back to the ECU. According to the multi-node control system, the two wires are used for achieving control of the ECU to the physical nodes, the number of the required wires when the control signals and the working voltage are independently transmitted is reduced, the quantity of the wires is less, assembly and control are convenient to achieve, maintenance is prone to achievement. In addition, the two wires are connected according to arbitrary connection orders.

Description

technical field [0001] The invention relates to the technical field of automatic control, in particular to a multi-node control system. Background technique [0002] The electronic expansion valve is composed of a stepping motor and a valve body, and the stepping motor drives the movement of the valve body. In the prior art, the driving circuit of the stepping motor is integrated on the main control board (ECU), and the ECU sends a control signal to the driving circuit of the stepping motor, and the driving circuit of the stepping motor drives the stepping motor to run. [0003] see figure 1 , which is a schematic diagram of an electronic expansion valve on a car in the prior art. [0004] The driving circuit of the stepper motor is located on the ECU100, so that the ECU100 directly controls the operation of the electronic expansion valve 200. Generally, the ECU100 needs at least four stepper motor control lines, and some need five or six control lines. How many control w...

AI Technical Summary

Problems solved by technology

How many control wires are required depends on the type of stepper motor, but no matter what kind of stepper motor, figure 1 The control architecture shown has the problem of a large number of control lines and complex circuits.

Moreover, ordinary electronic expansion valves have a prescribed wiring sequence, which must be connected according to the requirements, especially the positive and negative poles of the power supply cannot be connected incorrectly.

[0005] To sum up, the wiring harness of the control structure of the electronic expansion valve in the prior art is relatively complicated, which brings inconvenience to installation and control

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