CN2050883U

CN2050883U - Instrument for rotational speed step and timing of diesel engine

Info

Publication number: CN2050883U
Application number: CN 89213579
Authority: CN
Inventors: 俞建林
Original assignee: PLAN AND DESIGN INST CHANGJIANG CHANNEL BUREAU
Current assignee: PLAN AND DESIGN INST CHANGJIANG CHANNEL BUREAU
Priority date: 1989-06-30
Filing date: 1989-06-30
Publication date: 1990-01-10

Abstract

The utility model discloses an instrument for stepping and timing the rotational speed of a diesel engine, comprising an SCM as a core. The instrument can accurately and automatically record the running time of a marine diesel engine under different rotational speeds. The utility model has the advantages of simple structure, convenient operation, convenient installation and convenient debugging. The instrument is suitable for occasions for measuring the rotational speed of a marine vehicle or other machines in steps.

Description

Instrument for rotational speed step and timing of diesel engine

The utility model relate to a kind of write down diesel engine particularly marine diesel engine at the different rotating speeds instrument of following working time.

The characteristic curve of diesel engine has reflected such fact, the fuel consumption that is marine main engine becomes to increase progressively relation basically with its rotating speed, therefore have only add up the working time that main frame is under the different class rotating speeds, managerial department could rationally scientifically distribute the oil consumption index so that administration of energy conservation, " flowmeter when bunker oil is long-pending " of Shanghai Inland Water Transport Department development in 1984, " the DY100-III type fuel consumption meter " of Nantong steamship company development, the domestic existing relevant rotating speeds of measuring such as " YHY-82J type fuel consumption indicators " of Shanghai harbour affairs Institute of Science development, the all unallocated rotating speed class of the instrument of oil consumption, more there is not the time accumulating function under the different rotating speeds, this just can not satisfy the stepping clocking requirement of managerial department's proposition as mentioned above, and above-mentioned instrument constitutes by the general semiconductor device, element is many, precision is low, power consumption is big, and the reliability antijamming capability is undesirable.

The purpose of this utility model is to utilize microcomputer technology or exactly utilizes single-chip microcomputer, provides scientific basis thereby constitute a kind of instrument of marine diesel engine in different rotating speeds following working time that can accurately write down automatically for managerial department formulates energy consumption index.

Fig. 1 has introduced and has realized that a kind of circuit that above-mentioned purpose adopted constitutes.In fact, it be exactly one with the one chip microprocessor chip 8031(1 of Intel Company) be the simple microcomputer system that core constitutes.Wherein 8031 P0 and P1 mouth are used for expanding external memory EPROM(2), utilize two line P3.0 of P3 mouth, three mouths of P1.0, the P1.1 of the serial i of P3.1/O mouth function and P1 mouth, P1.2 and 3/8 decoder (4), string, parallel data transducer (5) etc. constitute the dynamic digital display unit.3,4,5 three mouths of P1 mouth drive red, yellow, green three LED pipes respectively to make the usefulness of rotating speed class demonstration; P1.6 is used for accepting the reset signal of external clear command button (7); Utilize P3.2 mouth external interrupt O function, receive artificial read instruction and search each grade requirement of running time at random to satisfy the operator, P3.3 is used for receiving the speed probe pulse signal of sending here through frequency divider (6), this sensor is a kind of Hall element, the bakelite rotating disk (11) that is loaded on the diesel engine oil pump shaft (12) rotates with diesel engine, every once just it triggering near Hall element (14) of the little magnet steel of installing on it (13) once produces a pulse signal, the frequency of this signal has just been reacted the rotating speed of diesel engine, be sent to frequency divider (6) through line driver 75452, promptly send into 8031 P3.3 mouth after putting conversion here in order, this signal waveform is referring to Fig. 3 (21).Utilize the timing of single-chip microcomputer Timer mouth, tally function can be measured the pulsewidth of (21) referring to (22) among Fig. 3, thereby reaches the purpose of measuring rotating speed, utilizes the memory function of single-chip microcomputer can write down operating time under the diesel engine different rotating speeds.

The utility model is that core constitutes with the single-chip microcomputer, can write down different rotating speeds following working time, and is simple in structure, and debugging is installed, and uses all easily, is suitable for marine main engine rotating speed or other rotating speed stepping and measures prison and show the occasion use.

Description of drawings and implementation issue introduction:

Fig. 1 is the utility model electrical schematic diagram.(1) is 8031 singlechip chips of Intel Company among the figure, and (2) are the EPROM memory, and (3) are data buffer register, and (4) are 3/8 decoder, and (5) are serial/parallel transducer, and (6) are frequency divider, is a two-divider here.In the embodiment that this schematic diagram provided, (2) adopt the 2716EPROM memory, and (3) adopt 74LS373, (4) adopt 74LS138, (5) adopt 74LS164, and (6) adopt a JK flip-flop 7476, (7) be reset key, (8) are for searching key.

Fig. 2 is the working sensor schematic diagram.(11) are diesel engine bakelite rotating disk among the figure, and (12) are the diesel engine oil pump shaft, and (13) are little magnet steel, and (14) are Hall element.

Fig. 3 is a signal waveforms.(20) are the signal waveform from sensor among the figure, it has reacted the diesel engine speed situation, (21) be the above-mentioned signal after the conversion of process frequency divider (6), (22) be single-chip microcomputer timer sprocket pulse, it is with the high level pulsewidth of the pulse interval wave recording (21) of 2 μ S, thereby obtains accurate diesel engine transient speed.

Consider that present most of inland navigation craft all adopts four-cycle diesel, its rated speed one ship is no more than 1500～1800 rev/mins, guarantee enough fast sample rate simultaneously again in order promptly to reach accurate testing result, we have adopted and have utilized the single-chip microcomputer clock to measure the method survey rotating speed that diesel engine per two changes needed time in an embodiment, can record diesel engine like this and finish the time that complete cycle is required, guaranteed the precision of each sampling, here be to utilize 8031 Timer function to realize above-mentioned requirements, Timer T ₁It is as follows to measure P3.3 mouth high level pulsewidth program:

MOV TMOD, #90H is with T ₁Be set to 1 inspection of working method

MOV THI，＃OOH

MOV THI, #OOH T ₁Initialization, all clear O

LOOP1： JB P3.3 LOOP1

LOOP2:JNB P3.3 LOOP2 waits for that 1 complete pulse to pulse front edge arrives

SETB TR1 starts T1

LOOP3:JB P3.3 LOOP3 waits for that pulse ends

CLR TRI stops T ₁

After this program running, TH ₁, TL ₁In just deposited the high level width of this pulse in, it is represented by 16 binary codes, when master clock adopts 6MHZ, sampling time≤0.2S; Because under the 6MHZ clock, 16 bit timing devices are limited to 131.072mS when maximum, therefore if another Timer TO is made as 125mS regularly, and a counter is set in the TO interrupt service subroutine, make TO interrupt 8 times (behind the 125ms * 8=1000ms), the side adds 1 in the corresponding mask register of current rotating speed, so the minimum time unit that present embodiment provides is 1S.Conversion slightly, the utility model also can be with printer with the record service data, also can expand to the multiloop rotation speed monitoring system.

Claims

1, a kind of diesel engine speed divides the retaining chronograph, comprise the Hall speed probe, the tach signal processor, it is characterized in that the tach signal processor mainly is by a kind of time control door that self has, the time main pulse generator, counter, arithmetic mean unit, relatively the single-chip microcomputer (1) of arbiter and various interface circuit constitutes; Speed probe (14) links to each other through the inlet opening of frequency divider (6) with this singlechip chip (1); (1) dual serial I/O mouth, three delivery outlets and 3/8 decoder (4), string, parallel data transducer (5) etc. are formed the dynamic digital display unit; All the other are interfaced to this chip rare three and link to each other with red, yellow, green three LED pipe respectively and indicate rotating speed with stepping, one links to each other with clear command button (7) accepting external reset signal, one with search key (8) and link to each other to satisfy the needs that the operator searches rotating speed at random.