CN202033379U

CN202033379U - Electronic revolution hour meter of engine

Info

Publication number: CN202033379U
Application number: CN2011200602544U
Authority: CN
Inventors: 陈荣明; 叶洪; 王海红; 朱明星
Original assignee: SHAOXING TIANKE ELECTRONICS CO Ltd
Current assignee: SHAOXING TIANKE ELECTRONICS CO Ltd
Priority date: 2011-03-04
Filing date: 2011-03-04
Publication date: 2011-11-09
Anticipated expiration: 2021-03-04

Abstract

The utility model discloses an electronic revolution hour meter of an engine, which comprises a power voltage stabilizing circuit, a power state detecting circuit, a signal input circuit, a main control circuit and the like, wherein the main control circuit consists of a single-chip microcomputer, an LCD (liquid crystal display) driving chip and an LCD. An engine revolution signal can directly drive an electronic moving-magnet revolution meter or an electronic step motor revolution meter in a PWM (pulse-width modulation) manner by the aid of an I/O (input/output) port of the single-chip microcomputer after being subjected to digital frequency measurement by the single-chip microcomputer, meanwhile, an input signal is timed by software of the single-chip microcomputer, and timing content is displayed by the LCD. The electronic revolution hour meter of the engine uses the single-chip microcomputer for main control and adopts digital frequency measurement and software conversion, thereby being fine in indicating linearity, high in measuring accuracy and wide in adjustment range. The electronic revolution meter and a work hour meter are in integrated design, and the electronic revolution hour meter is compact in structure and lower in manufacturing cost.

Description

Motronic control maps rotating speed hour meter

Technical field:

The utility model relates to technical field of engineering machinery, specifically is exactly to be used for measuring rotary speed of diesel engine and a kind of Motronic control maps rotating speed hour meter based on single-chip microcomputer control technology of working time in the engineering machinery.

Background technology:

Along with the raising of domestic engineering machinery technical merit, the application of Motronic control maps tachometer gage is popularized gradually.The use for diesel engine electronic tachometer generally adopts the magnetic induction sensor measured on the flywheel shell or measurement and crankshaft of diesel engine that the sine wave freuqency signal of exporting on the alternator phase line of fixed drive ratio is arranged, and the method that frequency signal converts the deflection angle that is installed on the pointer on the Dial of instrument to is realized the indication of rotating speed.Current electronic tachometer circuit commonly used on engineering machinery mainly is made up of mimic channel, its principle is that the frequency signal that will be shaped to behind the square wave carries out integration with integrating circuit, obtain the magnitude of voltage proportional, magnitude of voltage is converted to the phase signal that drives the moving-magnetic type gauge outfit by the tan circuit again with frequency input signal.Change the adjustment of RC constant realization ratio by the potentiometer of regulating in the integrating circuit in the debug process.An engine operation hour meter is designed to a separate part usually, and inside is the quartz electronic timing clock of a band time switch, controls the timing of internal clocking clock by the output voltage that whether has of judging generator.

Above electronic tachometer general scheme exists the mimic channel measuring accuracy not high, and the potentiometer range of adjustment is little, deficiencies such as the non-linear uncompensated measure of gauge outfit.In addition, a hour meter is designed to increase volume and use cost in use behind the separate part.

The utility model content:

The purpose of this utility model is exactly the deficiency at prior art, and a kind of Motronic control maps rotating speed hour meter is provided, and it adopts integrated design with electronic tachometer and working hours meter, compact conformation, and manufacturing cost is lower, measuring accuracy and indication linearity height.

Technology solution of the present utility model is as follows:

Motronic control maps rotating speed hour meter, comprise 12V mu balanced circuit, power state detection circuit and 5V mu balanced circuit, the 12V mu balanced circuit is converted to 12V voltage with 24V engine ignition supply voltage, is converted to the 5V direct supply through the 5V mu balanced circuit again and powers to entire circuit;

Whether the output terminal of power state detection electric circuit inspection mu balanced circuit is in opening, and governor circuit is made up of single-chip microcomputer, LCD chip for driving and LCD display;

The tach signal of engine rotational speed signal after obtaining handling after signal input circuit filtering, the shaping, tach signal after this processing inputs to single-chip microcomputer, and single-chip microcomputer carries out using the PWM mode directly by single-chip processor i/o port driver moving-magnetic type electronic tachometer or step motor type electronic tachometer after the digital Frequency Measuring to this signal; Simultaneously single-chip microcomputer after to this processings the tach signal timing and send command signal and drive LCD display demonstration timing content by the LCD chip for driving.

Described single-chip microcomputer is an ATMEGA8L model single-chip microcomputer.

Described power state detection circuit constitutes a bleeder circuit by the 21 voltage stabilizing diode and the 22 resistance, the 23 resistance, when the power state detection electric circuit inspection when this voltage drops to 1.8V, single-chip microcomputer sends command signal and disconnects the shutdown of 5V mu balanced circuit power supply, and the 24 resistance is single-chip microcomputer input port current-limiting resistance.

Described brilliant shake provides time reference for timing, and the time of timing was that unit adds up with 0.1 hour, and drove the accumulative total working time that LCD display shows engine by the LCD chip for driving.

The beneficial effects of the utility model are:

Since the frequency signal of input with indicate the digital conversion that has adopted software control between angle, the ratio of gear during conversion can be provided with arbitrarily in reasonable range, makes conversion accuracy height, setting range wide.

2. owing to adopt singlechip technology, software is designed to can revise one by one the nonlinearity erron of every some scale indicating positions of gauge outfit when debugging, makes the instrument indication linearity good.

3. owing to utilized ATMEGA series monolithic I/O port load capacity height, adopt software PWM mode analog drive signal cleverly and, cancelled the gauge outfit driving circuit, reduced circuit cost directly by single-chip processor i/o port driver gauge outfit; And can under the situation of circuit not being made any change, only just can arbitrarily change the gauge outfit form (moving-magnetic type gauge outfit or step motor type gauge outfit) of driving, improve the dirigibility of using by adjusting the software setting option.

4. after a hour meter function was combined in the tachometer gage, two independent instrument merge became one, has reduced volume; Because the free time of hour meter with tachometer gage common source and governor circuit and when utilizing software to carry out the tachometer gage function is carried out clocking capability, has made full use of hardware resource, has reduced circuit cost.

Description of drawings:

Fig. 1 is a circuit frame principle figure of the present utility model

Fig. 2 is the circuit diagram of the 12V mu balanced circuit in the utility model circuit diagram

Fig. 3 is the circuit diagram of the 5V mu balanced circuit in the utility model circuit diagram

Fig. 4 is the circuit diagram of the power state detection circuit in the utility model circuit diagram

Fig. 5 is the circuit diagram of the signal input circuit in the utility model circuit diagram

Fig. 6 is the circuit diagram of LCD display circuit in the governor circuit in the utility model circuit diagram

Fig. 7 is the circuit diagram of LCD chip for driving in the governor circuit in the utility model circuit diagram

Fig. 8 is the circuit diagram of single-chip microcomputer and electronic tachometer in the governor circuit in the utility model circuit diagram

Among the figure: Fig. 1 and Fig. 2 are electrically connected with electric connection point a, and Fig. 2 and Fig. 3 are electrically connected with electric connection point b, and Fig. 2 and Fig. 8 are electrically connected with electric connection point c, and Fig. 5 and Fig. 8 are electrically connected with electric connection point d.

Embodiment:

Embodiment: see shown in Fig. 1 to 8, Motronic control maps rotating speed hour meter, comprise 12V mu balanced circuit 10, power

state detection circuit

20 and 5V mu balanced

circuit

30,12V mu balanced circuit 10 is converted to 12V voltage with 24V engine ignition supply voltage, is converted to the 5V direct supply through 5V mu balanced circuit 30 again and powers to entire circuit;

Whether the output terminal that power state detection circuit 20 detects mu balanced circuit 10 is in opening, and governor circuit 50 is made up of single-chip microcomputer 51, LCD chip for driving 57 and LCD display 58;

The tach signal of engine rotational speed signal after obtaining handling after signal input circuit 40 filtering, the shaping, tach signal after this processing inputs to single-chip microcomputer 51, and 51 pairs of these signals of single-chip microcomputer carry out using the PWM mode directly by single-chip processor i/o port driver moving-magnetic type electronic tachometer or step motor type electronic tachometer 56 after the digital Frequency Measuring; Tach signal timing after 51 pairs of these processing of single-chip microcomputer is simultaneously also sent command signal by LCD chip for driving 57 driving LCD display 58 demonstration timing contents.

Described single-chip microcomputer 51 is an ATMEGA8L model single-chip microcomputer.

Described power state detection circuit 20 constitutes a bleeder circuit by the 21 voltage stabilizing diode 21 and the 22 resistance the 22, the 23 resistance 23, when power state detection circuit 20 detects this voltage and drops to 1.8V, single-chip microcomputer 51 sends command signal and disconnects the shutdown of 5V mu balanced circuit 30 power supplys, and the 24 resistance 24 is single-chip microcomputer 51 input port current-limiting resistances.

Described crystalline substance shake 52 is for timing provides time reference, and the time of timing was that unit adds up with 0.1 hour, and drives the accumulative total working time that LCD display 58 show engines by LCD chip for driving 57.

Claims

1. Motronic control maps rotating speed hour meter comprises 12V mu balanced circuit (10), power state detection circuit (20) and 5V mu balanced circuit (30), it is characterized in that:

12V mu balanced circuit (10) is converted to 12V voltage with 24V engine ignition supply voltage, is converted to the 5V direct supply through 5V mu balanced circuit (30) again and powers to entire circuit;

Whether the output terminal that power state detection circuit (20) detects mu balanced circuit (10) is in opening, and governor circuit (50) is made up of single-chip microcomputer (51), LCD chip for driving (57) and LCD display (58);

The tach signal of engine rotational speed signal after obtaining handling after signal input circuit (40) filtering, the shaping, tach signal after this processing inputs to single-chip microcomputer (51), and single-chip microcomputer (51) carries out using the PWM mode directly by single-chip processor i/o port driver moving-magnetic type electronic tachometer or step motor type electronic tachometer (56) after the digital Frequency Measuring to this signal; Simultaneously single-chip microcomputer (51) after to this processings the tach signal timing and send command signal and drive LCD display (58) demonstration timing content by LCD chip for driving (57).

2. Motronic control maps rotating speed hour meter according to claim 1 is characterized in that: described single-chip microcomputer (51) is an ATMEGA8L model single-chip microcomputer.

3. Motronic control maps rotating speed hour meter according to claim 1 and 2, it is characterized in that: power state detection circuit (20) constitutes a bleeder circuit by the 21 voltage stabilizing diode (21) and the 22 resistance (22), the 23 resistance (23), when power state detection circuit (20) detects this voltage and drops to 1.8V, single-chip microcomputer (51) sends command signal and disconnects the shutdown of 5V mu balanced circuit (30) power supply, and the 24 resistance (24) is single-chip microcomputer (51) input port current-limiting resistance.

4. Motronic control maps rotating speed hour meter according to claim 1 and 2, it is characterized in that: brilliant shake (52) provides time reference for timing, the time of timing was that unit adds up with 0.1 hour, and drove the accumulative total working time that LCD display (58) shows engine by LCD chip for driving (57).