CN2088168U - Intelligent protector of diesel engine - Google Patents

Abstract

The utility model discloses an intelligent protector for a diesel engine, comprising a speed detecting fluted disc, an electromagnetic sensor, an amplifying wave shaping circuit, a microcomputer control circuit, a logic signal input and output and alarm display circuit, a power output circuit and an automatic reset circuit. The microcomputer control circuit adopts a monolithic microcomputer. For the monolithic microcomputer treats the digital signal, the digital signal can not be changed following the change of the environmental condition and the element parameter. The overrunning setting value is stored in a memory as the form of the numerical code and is never changed. The utility model overcomes the alarm miss phenomenon brought of the overrunning comparison value caused by the change of the voltage reference value in the traditional linear circuit. Therefore, the utility model has the advantage of stable and reliable work.

Description

Intelligent protector of diesel engine

The utility model belongs to the control technique field of diesel engine.

The overspeed governor switch that is used for diesel engine at present; all be to be the control core with the linear circuit; its hypervelocity setting valve is to adjust by means of adjustable potentiometer; debugging difficulty is big on the one hand; after the long-term use of user, because the variation of the aging and environmental conditions of linear element, its hypervelocity value can depart from former setting valve greatly on the other hand; thereby cause not reporting to the police or false alarm, lose protective action fully.

The purpose of this utility model provides a kind of stable and reliable operation diesel engine protective gear.

Technical solution of the present utility model is: it comprises speed measuring fluted disc and electromagnetic sensor, the output terminal of electromagnetic sensor is connected to amplification and rectification circuit, the output terminal of amplification and rectification circuit is connected with microcomputer control circuit, logical signal input output and alarm indication circuit and the automatic reset circuit in addition that are connected with microcomputer control circuit, the output terminal of logical signal input output and alarm indication circuit is connected with power output circuit.

Because the utility model has adopted microcomputer control circuit, microcomputer processing be digital signal, can not change because of the variation of ambient temperature, component parameters, its hypervelocity comparison value is stored in the EPROM memory with digital form, never change the warning fault phenomenon that the hypervelocity comparison value that has overcome the conventional linear circuit causes because of the variation of voltage reference value.Microcomputer also can monitor automatically to the self-operating state simultaneously, has guaranteed the reliability of protector.

Below in conjunction with drawings and Examples, describe circuit of the present utility model in detail and constitute and working principle.

Fig. 1 is a structured flowchart of the present utility model.(1) is side speed fluted disc among the figure, and (2) are electromagnetic sensor, and (3) are amplification and rectification circuit, (4) be microcomputer control circuit, (5) are logical signal input output and alarm indication circuit, and (6) are power output circuit, (7) be automatic reset circuit, (8) are power circuit.

Fig. 2 is the circuit theory diagrams of microcomputer control circuit.

Fig. 3 is the circuit theory diagrams of amplification and rectification circuit.

Fig. 4 is the electrical schematic diagram of logical signal input output and alarm indication circuit.

Fig. 5 is the electrical schematic diagram of power circuit.

Fig. 6 is the electrical schematic diagram of automatic reset circuit.

Fig. 7 is the electrical schematic diagram of power output circuit.

In the embodiment that accompanying drawing provides, microcomputer control circuit (4) comprises one chip microcomputer IC ₃, and the memory under program IC that is connected with its pin ₁, address latch IC ₂, four and the door IC ₆With quartz crystal oscillator HC ₆, one chip microcomputer IC ₃Select 8031AH for use, memory under program IC ₁Select 2732A for use, address latch IC ₂Select 74LS373 for use, four with the door IC ₆Select 74LS08 for use, quartz crystal oscillator HC ₆Be 6MHZ, be connected to capacitor C between its two ends and the ground respectively ₁₁, C ₁₂, the corresponding annexation of the pin of above-mentioned each part is seen Fig. 2.Amplification and rectification circuit (3) has two triode BG ₁, BG ₂, triode BG ₁Current collection and four and the door IC ₆Connect triode BG ₁Base stage and triode BG ₂Inter-collector is connected to the resistance R of series connection ₂With reference diode WD ₁, the equal ground connection of its emitter is connected to capacitor C respectively between base stage and ground ₂And C ₃, collector electrode passes through resistance R respectively ₁, R ₃Be connected triode BG with power supply ₂Base stage is passed through resistance R ₄Be connected with electromagnetic sensor, also be parallel with diode D on the electromagnetic sensor ₂Logical signal input output and alarm indication circuit (5) comprise six road driver ICs ₄With analog line driver IC ₅, six road driver ICs ₄With four with the door IC ₆With four AND NOT gate IC ₇Connect four AND NOT gate IC ₇With analog line driver IC ₅Connect analog line driver IC ₅Also be connected with relay J ₁, J ₂, relay J ₁With the alert K switch that disappears ₃Connect relay J ₂With emergency stop switch K ₄Connect six road driver ICs ₄On also pass through resistance R ₆～R ₁₀Be connected to LED ₁～LED ₅, and be connected to the normally opened contact SW of water temperature relay, oil pressure relay normally opened contact YY, " stormy waves ", " normally " selector switch K ₂, oil temperature relay normally opened contact YW respectively with one chip microcomputer IC ₃Pin connect, also be connected to resistance R respectively on above-mentioned three pins ₁₁～R ₁₃, six road driver ICs ₄Select 7407 for use, analog line driver IC ₅Select ULN2003 for use, four AND NOT gate IC ₇Select 74LS00 for use.Power circuit (8) comprise connection+24V and+the two-way key switch K of 12V ₁, can with K switch ₁That connect is diode D ₃, diode D ₃Be connected diode connected in parallel D between negative pole and ground ₄And capacitor C ₅, C ₆, this utmost point also passes through resistance R ₁₆With regulator block IC ₈Connect regulator block IC ₈On also be connected with capacitor C ₇, C ₈And resistance R ₁₇, resistance R ₁₇And be connected to LED between ground ₆, this power circuit can provide+5V ,+12V and+the 24V power supply.Automatic reset circuit (7) comprises ring counter IC ₉, with ring counter IC ₉The four AND NOT gate IC that connect ₁₀Be connected four AND NOT gate IC ₁₀Resistance R between pin ₂₀, R ₂₁And capacitor C ₉, C ₁₀, base stage is passed through resistance R ₁₉With four AND NOT gate IC ₁₀The triode BG that connects ₃, triode BG ₃Grounded-emitter connection, its collector electrode is connected to resistance R ₁₅, R ₁₈And capacitor C ₄, capacitor C ₄On be parallel with the resistance R of connecting with reset switch NQ ₅, ring counter IC ₉Select CD4040 for use, four AND NOT gate IC ₁₀Select 74LS00 for use.Power output circuit comprises that an end ground connection, the other end are connected to relay normally open contact J respectively ₂, J ₁Parking solenoid valve DZ and electronic alarm loudspeaker RL, be parallel with diode D on the parking solenoid valve DZ coil ₅, be parallel with diode D on the electronic alarm loudspeaker RL ₆Connecting relation between above-mentioned each circuit all can be by finding out among the figure.

Working principle of the present utility model is: the tach signal from electromagnetic sensor (2) is sent into one chip microcomputer IC after amplification and rectification circuit (3) amplifies shaping ₃, single-chip microcomputer IC ₃Pin 8 start timer, counter works simultaneously, timing arrives, and is closed simultaneously regularly and counting by program control, make regularly and counting synchronously, to guarantee rate accuracy.The content of counter and hypervelocity setting valve compare, if hypervelocity is judged earlier to belong to " stormy waves " (promptly peculiar to vessel) or " normally " (being that the land is used), if " stormy waves " shelves, then change the speed limit processor over to, send and close throttle and overspeed alarming instruction, single-chip microcomputer IC ₃Pin 3 output low levels, LED ₅Bright, while relay normally open contact J ₁, J ₂Acoustooptic alarm is sent in adhesive, and throttle is closed in solenoid valve DZ action, when rotating speed drops to rated speed when following, single-chip microcomputer IC ₃Pin 3 output high level, alarm signal is removed, and recovers throttle; If " normally " retaining, changing over to during hypervelocity stops handles subroutine, sends to close throttle and overspeed alarming instruction.Single-chip microcomputer IC ₃Pin 3 guarantee low level 40S, stop guaranteeing, recover automatically then.This device also has low fuel pressure, water temperature height, the warm high protective function of oil, and fuel injection pressure signal is imported single-chip microcomputer IC by oil pressure relay YY by logical signal input output and alarm indication circuit (5) ₃, single-chip microcomputer is arranged to the interruption of work mode, when diesel engine speed reaches idle speed value, response is interrupted, if the acoustooptic alarm signal is then sent in low fuel pressure this moment, otherwise do not respond interruption, computer adopts the way of cycle detection to handle in real time to oil temperature, water temperature signal.All alarm signals are by six road driver ICs ₄Drive diode displaying, simultaneously by analog line driver IC ₅Drive relay J ₁, J ₂, make solenoid valve DZ and electronic horn RL work.

Claims (5)

1, a kind of diesel engine intellective protector; comprise speed measuring fluted disc (1) and electromagnetic sensor (2); it is characterized in that also comprising the amplification and rectification circuit (3) that is connected with electromagnetic sensor (2); the microcomputer control circuit (4) that is connected with amplification and rectification circuit (3) output terminal; logical signal input output that are connected with microcomputer control circuit (4) and alarm indication circuit (5) and automatic reset circuit (7), and the power output circuit (6) that is connected with logical signal input output and alarm indication circuit (5) output terminal.

2, diesel engine intellective protector according to claim 1 is characterized in that microcomputer control circuit (4) comprises one chip microcomputer IC ₃, and connected memory under program IC ₁, address latch IC ₂, four and the door IC ₆With quartz crystal vibration HC ₆

3, diesel engine intellective protector according to claim 1 is characterized in that amplification and rectification circuit (3) comprises two triode BG ₁, BG ₂, at triode BG ₁Base stage and another triode BG ₂Between producing, collector electrode is connected to the resistance R of series connection ₂With reference diode WD ₁, the base stage of above-mentioned two triodes is connected to capacitor C respectively ₂, C ₃, collector electrode is connected to resistance R respectively ₁, R ₃, triode BG ₁Collector electrode and four and the door IC ₆Connect triode BG ₂Pass through resistance R ₄Be connected with electromagnetic sensor, be parallel with diode D on the electromagnetic sensor ₂

4, diesel engine intellective protector according to claim 1 is characterized in that logical signal input output and alarm indication circuit (5) comprise six road driver ICs ₄With analog line driver IC ₅, analog line driver IC ₅With four AND NOT gate IC ₇Connect, and be connected to relay J ₁, J ₂, relay J ₁, J ₂Be connected with the alert K switch that disappears respectively ₃With emergency stop switch K ₄, six road driver ICs ₄Respectively with four with the door IC ₆With four AND NOT gate IC ₇Connect, and pass through resistance R ₆～R ₁₀Be connected to LED ₁～LED ₅

5, diesel engine intellective protector according to claim 1 is characterized in that automatic reset circuit (7) comprises ring counter IC ₉, with ring counter IC ₉The four AND NOT gate IC that connect ₁₀, base stage is passed through resistance R ₁₉With four not gate IC ₁₀The triode BG that connects ₃, reset switch NQ passes through resistance R ₅With triode BG ₃Collector electrode connects.

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