CN203246412U

CN203246412U - On-line detection circuit of water tank

Info

Publication number: CN203246412U
Application number: CN 201320294687
Authority: CN
Inventors: 傅清河
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-05-27
Filing date: 2013-05-27
Publication date: 2013-10-23
Anticipated expiration: 2023-05-27

Abstract

The utility model relates to an on-line detection circuit of a water tank. The on-line detection circuit of the water tank is composed of a water lack detection control circuit, a single-chip microcomputer control circuit and an RS485 communication interface circuit. Output signals of the water lack detection control circuit are transmitted to the single-chip microcomputer control circuit, and output signals of the single-chip microcomputer control circuit are sent to the RS485 communication interface circuit. The on-line detection circuit of the water tank has the advantages of being sensitive and reliable, high in anti-interference performance and the like. Even through a leading wire of an automobile sensor is long or the contact resistance is large, the on-line detection circuit can still work reliably. Meanwhile, detected results are transmitted to an automobile display disk through a PLC control system, so that the current state is displayed, and the on-line detection circuit is favorable for maintenance.

Description

Water tank is at line detection circuit

Technical field

The utility model relates to a kind of testing circuit, particularly be that a kind of radiator is at line detection circuit.

Background technology

Automotive engine utilizes water circulation to cool, and when lack of water appears in the driving engine of most of automobiles, can reflect by the indication of water thermometer, lack of water alarm lamp; But the automobile of rear-mounted engine (such as city motor bus, motorcoach etc.) is owing to reasons such as the circuit of warning device sensor are long, the circuit contact resistance is large, often can occur that lack of water is not reported to the police or the phenomenon such as lack of water flase alarm not.

The utility model content

The purpose of this utility model is to overcome above-mentioned deficiency, provides a kind of water tank at line detection circuit.

The technical scheme that its technical matters that solves the utility model adopts is: water tank is at line detection circuit, detecting control circuit, single chip machine controlling circuit and RS485 communication interface circuit by lack of water consists of, the output signal that described lack of water detects control circuit is transferred to single chip machine controlling circuit, and the output signal of described single chip machine controlling circuit is sent to the RS485 communication interface circuit.

Described lack of water detects control circuit and is made of the time-base integrated circuit IC that sensor and mouth thereof connect, and described time-base integrated circuit IC periphery is connected with resistor R1, cond C2 and zener diode VS.

Described RS485 communication interface circuit is sent to the PLC control system by 75176 communication module IC2, drives the auto meter display panel and shows current state.

By adopting above-mentioned technical scheme, the beneficial effects of the utility model are: the utlity model has the characteristics such as circuit is sensitive reliably, antijamming capability is strong, even the automobile sensor lead-in wire is long or contact resistance is large, also can work reliably, reach the automobile display panel by the PLC control system simultaneously, show current state, be conducive to and safeguard.

Description of drawings

Fig. 1 is frame structure schematic diagram of the present utility model;

Fig. 2 is schematic circuit diagram of the present utility model.

The specific embodiment

Further specify the utility model below in conjunction with the drawings and specific embodiments.

As shown in Figure 1 and Figure 2, water tank of the present utility model is at line detection circuit, detecting control circuit 1, single chip machine controlling circuit 2 and RS485 communication interface circuit 3 by lack of water consists of, the output signal that described lack of water detects control circuit 1 is transferred to single chip machine controlling circuit 2, and the output signal of described single chip machine controlling circuit 2 is sent to RS485 communication interface circuit 3.

Described lack of water detects control circuit 1 and is made of the time-base integrated circuit IC that sensor and mouth thereof connect, described time-base integrated circuit IC periphery is connected with resistor R1, cond C2 and zener diode VS, described RS485 communication interface circuit 3 is sent to the PLC control system by 75176 communication module IC2, drives the auto meter display panel and shows current state.

At automotive engine not during lack of water, the electrode of sensor is connected with ground (bonding) by the resistance of water, making the 2nd pin and the 6th pin of time-base integrated circuit IC is low level (being lower than Vcc/3), the 3rd pin output high level of time-base integrated circuit IC, this signal is input to the 21st pin I/O end of micro controller system IC1, after micro controller system IC1 identification, do not send the driving signal.

When the water level of driving engine is down to the electrode of sensor when following, the 2nd pin of time-base integrated circuit IC and 6 pin become high level (being higher than 2Vcc/3), circuit upset in the time-base integrated circuit IC, its the 3rd pin output low level, this signal is input to the 21st pin I/O end of micro controller system IC1, after micro controller system IC1 identification, micro controller system IC1 sends the director data information that drives to 75176 communication module IC2, after the decoding of 75176 communication module IC2 internal circuits, reach the PLC control system through the RS485 bus, drive the auto meter display panel and show current state, be conducive to and safeguard, the reminding driver driving engine is lack of water.

Above-described only is a preferred embodiment of the present utility model, can not limit the scope that the utility model is implemented, and every equalization of doing according to the utility model claim changes and decorates, and all should still belong in the scope that the utility model contains.

Claims

1. water tank is at line detection circuit, it is characterized in that: detect control circuit (1), single chip machine controlling circuit (2) and RS485 communication interface circuit (3) by lack of water and consist of, the output signal that described lack of water detects control circuit (1) is transferred to single chip machine controlling circuit (2), and the output signal of described single chip machine controlling circuit (2) is sent to RS485 communication interface circuit (3).

2. water tank according to claim 1 is at line detection circuit, it is characterized in that: described lack of water detects control circuit (1) and is made of the time-base integrated circuit IC that sensor and mouth thereof connect, and described time-base integrated circuit IC periphery is connected with resistor R1, cond C2 and zener diode VS.

3. water tank according to claim 1 and 2 is characterized in that at line detection circuit: described RS485 communication interface circuit (3) is sent to the PLC control system by 75176 communication module IC2, drives the auto meter display panel and shows current state.