CN2254548Y

CN2254548Y - Measuring protector with programmable logic unit for diesel engine

Info

Publication number: CN2254548Y
Application number: CN 96214912
Authority: CN
Inventors: 郭行波
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-06-14
Filing date: 1996-06-14
Publication date: 1997-05-21
Anticipated expiration: 2006-06-14

Abstract

The utility model relates to a measuring protector with a programmable logic device for a diesel engine, which is composed of a sensor group which is composed of a speed sensor, a pressure sensor and a temperature sensor, a connection box, a circuit containing programmable logic device, a nixie display, an alarm, a parking controller and a test button. After signals generated by the sensors are logically calculated, the alarm or the parking controller is controlled to act to realize alarm and protection. Simultaneously, measured value with high accuracy can be displayed. The utility model has the advantages of simple structure, complete function of measurement and protection, high reliability and low cost.

Description

Adopt the diesel engine of programmable logic device (PLD) to measure protective device

The utility model belongs to the measurement protective device, especially adopts the diesel engine of programmable logic device (PLD) to measure protective device, is applicable to the occasion of diesel engine measurement protection.

Parameters such as the temperature during diesel engine work, pressure, time, rotating speed usually need automatic control, beyond the mark will the warning or protection automatically.Because parameters is correlated with, control or protection, warning need be differentiated by predetermined condition automatically, could correct operation.Prior art is finished like this: the signal of sensor input is leaded up to gauge outfit and is shown measured value, and another road is by a group relay, back output alarm and control signal.But this implementation has determined its limitation, so owing to use a lot of relay costs higher, poor reliability can only realize limited several functions, can not carry out perfect protection and control to diesel engine.

Task of the present utility model is the shortcoming that overcomes prior art, provides the diesel engine of a kind of rational in infrastructure, perfect in shape and function, cost is lower, reliability is high employing programmable logic device (PLD) to measure protective device.

A kind of diesel engine of programmable logic device (PLD) that adopts is measured protective device; include sensor groups (1); alarm (5); parking controller (6); sensor groups (1) comprises temperature sensor; pressure transducer; speed probe; mainly by terminal box (2); the circuit (3) that comprises programmable logic device (PLD); nixie display (4); test button (8); Switching Power Supply (9) is formed; the circuit (3) that comprises programmable logic device (PLD); nixie display (4); alarm (5); parking controller (6); test button (8); Switching Power Supply (9) constitutes diesel engine and measures protective device main frame (7); the circuit (3) that comprises programmable logic device (PLD) is by capacitor C 1; C2 and crystal CY1 and FPGA (Field Programmable Gate Array) integrated package U1 form; when input is analog quantity; also comprise voltage comparator and peripheral circuit thereof; nixie display (4) is made up of charactron; sensor groups (1) is connected with terminal box (2); the circuit that comprises programmable logic device (PLD) (3) that terminal box (2) and diesel engine are measured protective device main frame (7) is connected, the circuit (3) that comprises programmable logic device (PLD) respectively with nixie display (4); alarm (5); parking controller (6); test button (8) connects.The temperature sensor of sensor groups (1) is the magnetic temperature switch.

Fig. 1 is the structured flowchart that the utility model diesel engine is measured protective device.

Fig. 2 measures the electrical schematic diagram of protective device main frame for the utility model diesel engine.

1-sensor groups wherein, the 2-terminal box, 3-comprises the circuit of programmable logic device (PLD), the 4-nixie display, the 5-alarm, the 6-parking controller, the 7-diesel engine is measured protective device main frame, 8-test button, 9-Switching Power Supply.

Fig. 1, Fig. 2 are embodiment of the present utility model.As Fig. 1; shown in Figure 2; principle of work of the present utility model and embodiment are: a kind of diesel engine of programmable logic device (PLD) that adopts is measured protective device; include sensor groups (1); alarm (5); parking controller (6); sensor groups (1) comprises temperature sensor; pressure transducer; speed probe; mainly by terminal box (2); the circuit (3) that comprises programmable logic device (PLD); nixie display (4); test button (8); Switching Power Supply (9) is formed; the circuit (3) that comprises programmable logic device (PLD); nixie display (4); alarm (5); parking controller (6); test button (8); Switching Power Supply (9) constitutes diesel engine and measures protective device main frame (7); the circuit (3) that comprises programmable logic device (PLD) is by capacitor C 1; C2 and crystal CY1 and FPGA (Field Programmable Gate Array) integrated package U1 form; when input signal is analog quantity; also comprise voltage comparator and peripheral circuit thereof; nixie display (4) is made up of charactron; sensor groups (1) is connected with terminal box (2); the circuit that comprises programmable logic device (PLD) (3) that terminal box (2) and diesel engine are measured protective device main frame (7) is connected, the circuit (3) that comprises programmable logic device (PLD) respectively with nixie display (4); alarm (5); parking controller (6); test button (8) connects.The temperature sensor of sensor groups (1) is the magnetic temperature switch.Its cardinal principle is: physical quantitys such as temperature, pressure, rotating speed are converted into electric signal by sensor groups (1).If sensor output is switching value, can directly be connected with the circuit that comprises programmable logic device (PLD) (3).If sensor output is analog quantity, then be connected with the circuit that comprises programmable logic device (PLD) (3) by a voltage comparator.When sensor does not have output signal, can pass through the signal of test button (8) analog sensor output, whether adopt the diesel engine of programmable logic device (PLD) to measure protective device main frame (7) with test normal.The circuit (3) that comprises programmable logic device (PLD) is realized to output alarm signal or control signal after the logical operation of provisioning request, promotes alarm (5) output alarm signal respectively or promotes parking controller (6) outputting parking signal.Simultaneously the signal of sensor groups (1) input is handled the back through the circuit (3) that comprises programmable logic device (PLD) and show measured value by nixie display (4) with digital form.Owing to adopt programmable logic device (PLD), the difficult complicated logical operation that realizes can show the physical quantity that records accurately before can realizing.In addition, if adopt field programmable logic device, then can be implemented under the situation of not changing circuit, logical relation is redefined, to satisfy on-the-spot needs fast, prior art then can't be implemented under the situation of not changing circuit, and logical relation is redefined.Embodiment of the present utility model is: the speed probe of sensor groups described in the utility model (1) is installed on the diesel engine main shaft, surveys its rotating speed.After the pressure transducer of sensor groups (1) is installed in the diesel lubrication oil strainer, survey lubricating oil pressure.The temperature sensor of sensor groups (1) is installed in the cooling water pipe of diesel engine, surveys cooling water temperature.During the diesel engine operate as normal, show tachometer value by nixie display (4), (can change circuit as requested as shown in Figure 2, show pressure, the temperature equivalence), when lubricating oil pressure is lower than certain value, and rotating speed is when also being lower than certain value, by the circuit that comprises programmable logic device (PLD) (3) control time-delay 5 seconds, output alarm and stop sign.Parking controller (6) control parking solenoid valve shuts oil circuit stops diesel engine, in order to avoid lubricating oil low pressure is damaged diesel engine.After rotating speed was higher than certain value or cooling water temperature and is higher than certain value, alarm (5) output sound and light alarm signal reminded the operator on duty to note diesel engine condition, takes corresponding measure.

The utility model compared with prior art, and is simple and reasonable, difficult answering of realizing before can realizing Assorted logical operation to improve measuring and protecting, has simultaneously that cost is low, antijamming capability strong, reliable The characteristics that property is high. Have bigger economic results in society and practical value.

Claims

1; a kind of diesel engine of programmable logic device (PLD) that adopts is measured protective device; include sensor groups (1); alarm (5); parking controller (6); sensor groups (1) comprises temperature sensor; pressure transducer; speed probe; it is characterized in that mainly by terminal box (2); the circuit (3) that comprises programmable logic device (PLD); nixie display (4); test button (8); Switching Power Supply (9) is formed; the circuit (3) that comprises programmable logic device (PLD); nixie display (4); alarm (5); parking controller (6); test button (8); Switching Power Supply (9) constitutes diesel engine and measures protective device main frame (7); the circuit (3) that comprises programmable logic device (PLD) is by capacitor C 1; C2 and crystal CY1 and FPGA (Field Programmable Gate Array) integrated package U1 form; nixie display (4) is made up of charactron; sensor groups (1) is connected with terminal box (2); the circuit that comprises programmable logic device (PLD) (3) that terminal box (2) and diesel engine are measured protective device main frame (7) is connected, the circuit (3) that comprises programmable logic device (PLD) respectively with nixie display (4); alarm (5); parking controller (6); test button (8) connects.

2, diesel engine as claimed in claim 1 is measured protective device, and the temperature sensor that it is characterized in that sensor groups (1) is the magnetic temperature switch.