CN201060207Y

CN201060207Y - Stepping motor type engine speed hours meter

Info

Publication number: CN201060207Y
Application number: CNU2007200849767U
Authority: CN
Inventors: 刘海泉
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-05-30
Filing date: 2007-05-30
Publication date: 2008-05-14
Anticipated expiration: 2017-05-30

Abstract

The utility model provides a step motor type engine rotate speed hour meter, which includes a meter cover 1, a finger 2, a dial 3, a light-conducting piece 4, a circuit board 5, a night light 6, a step motor 7, a shaft 8, a bracket 9, liquid crystal 10, a conductive column 11, a shell 12, and a clamping board 13. The utility model overcomes the shortcomings that the prior rotation speed hour meter has no digital rotation speed displaying function and has no engine great speed protecting function. The utility model has the advantages that the measurement precision is high, the production technique is simple, the volume of the meter is small, the structure is simple, etc.

Description

Step motor type engine speed hour meter

Technical field

The utility model relates to a kind of engine rotating speed hour meter, and more particularly it is a kind of step motor type engine speed hour meter.

Background technology

The engine speed indicator that has additional function is more and more used at the engine measurement and control area; along with development of science and technology; engine speed indicator is not only with pointer or the dull demonstration rotating speed of numeral; and need pointer (intuitively) and other additional functions to cooperatively interact; as genset; engineering truck; during automobile and tractor instrument etc. are used; except the rotating speed that needs pointer indication engine; also need the accumulated operating time of engine; the numeral rotating speed shows; be integrated in one with functions such as racing of the engine protections; this type of high-grade instrument mainly relies on from external (as German VDO company; and VDO company instrument does not possess digital rotating speed demonstration and overspeed protection function) import; cost an arm and a leg, homemade instrument adopts moving magnetic filed more, is difficult to reach performance requirements such as high precision and long-life.

Many years ago; the electronics rotating speed instrument that is used for automobile and measurement of engine rotate speed just begins one's study; homemade conventional engines tachometer gage; the mechanical type movements that adopt more; be that time counter (writing time) and moving magnetic filed cooperate (indication rotating speed); there is a lot of shortcomings in this structure; non-linear and discreteness as moving magnetic filed; the fluctuation of power supply all impacts the accuracy of measuring; also need to flow through bigger electric current in the moving magnetic filed and (cause heating; further make misregister; precision can only guarantee in 10%) etc.; measuring error is bigger; show that than higher and needs numeral the occasion of overspeed protection has no idea to meet the demands by the metering circuit of former design at accuracy requirement.Therefore, the occasion of having relatively high expectations in measuring accuracy is difficult to satisfy request for utilization.

The engine speed hour meter of domestic also useful stepper motor and lcd technology, computer chip design, engine speed hour meter as the design production of the smart auspicious instrument in Guangxi Ltd, its major defect is: 1, do not have digital rotating speed Presentation Function, 2, there is not engine defencive function at full speed, 3, pointer walk about discontinuous (walking about continuously, being quick on the draw of pointer is the core technology of this product); The product of Germany VDO company does not have above-mentioned 1,2 two function.

Domestic measurement of engine rotate speed technology also has whole employing numerals to show, does not have pointer to show (can not use because show not directly perceived) in automobile and engine measuring.

In order to remedy deficiency on the design of domestic engine speed hour meter, the performance and the deficiency on the imported product high price.We have designed this German VDO company product that is equal on technical feature, than the more perfect the utility model product of German VDO company's product function, to satisfy production practices and market demand.

Summary of the invention

The purpose of this utility model is to overcome the weak point of above-mentioned background technology and a kind of step motor type engine speed hour meter is provided.Its pointer rotating speed indication, the numeral rotating speed shows, engine operation stop character Presentation Function is also deposited, the every circle umber of pulse of engine can preset simultaneously, (engine is meant that rapidly the engine throttle control gear can not return and the high engine speeds running that causes and the state that can not stop to have increased engine speed control function at full speed, can cause engine badly damaged, even cause casualties), above function exists in the engine speed hour meter that the engine speed hour meter of (having control function) at home and abroad produces beyond example simultaneously, belongs to innovative product.

The purpose of this utility model reaches by following measure: step motor type engine speed hour meter, it comprises instrument mask 1, pointer 2, index dial 3, light guide sheet 4, circuit board 5, night light 6, stepper motor 7, axle 8, support 9, liquid crystal 10, conductive pole 11, shell 12, clamp 13 is characterized in that described circuit board 5 comprises magnetoelectric tachometric transducer, the tach signal treatment circuit, stabilized voltage supply, one-chip computer, the simulated pointer rotating speed indication loop that stepper motor and pointer are formed, the EEPROM electricity erasable memorizer, lcd drive chip, every circle number of teeth presets clear circuit, the protection control circuit at full speed that Computer I/O mouth is formed through power amplification, the whole instrument system that back lighting at night circuit is formed; Speed probe; the tach signal treatment circuit; one-chip computer; the pointer rotating speed indication loop that stepper motor and pointer are formed connects successively; the EEPROM electricity erasable memorizer; lcd drive chip and liquid crystal display; every circle number of teeth presets clear circuit and is connected on the one-chip computer; the protection control circuit at full speed that the I/O mouth of one-chip computer is formed through power amplifier is electrically connected successively; stabilized voltage supply is connected with one-chip computer with treatment circuit by the output branch road; the simulated pointer rotating speed indication loop that stepper motor and pointer are formed; the EEPROM electricity erasable memorizer; the lcd drive chip circuit; every circle number of teeth presets clear circuit; the protection control circuit at full speed that the I/O mouth of one-chip computer is formed through power amplifier; with the computing machine is that core is formed measurement; indication; show; control circuit, back lighting at night circuit is powered by system power supply.

In technique scheme, described back lighting at night circuit and automobile lampet interlock, the lighting voltage of little lamp switch offers all-night circuit after diode is handled, pointer and index dial, liquid crystal etc. are thrown light on.

In technique scheme, described instrument mask 1 is fixing by clamp 14 with shell 12.The utlity model has following advantage: allow that 1, the system power supply fluctuation range influences measuring accuracy greatly and not.As for the 24V automobile power source, allowable voltage long-time running and do not influence measuring accuracy between 16V-36V.2, instrument is low in energy consumption, measuring accuracy height (0.1%).3, the engine speed pulse of 1-25000HZ can be handled, the measurement of all gasoline and rotary speed of diesel engine can be satisfied, and the omnidistance degree of accuracy very high (0.1%) of this engine speed hour meter.4, manufacturing process is simple, and the instrument volume is little, and is simple in structure.

But the utility model also has the every circle number of teeth of engine flywheel preparatory function simultaneously; the cumulative time Protection Counter Functions; engine operation and stop the tag mark Presentation Function; engine speed numeral Presentation Function; engine operation cumulative time memory and Presentation Function; the function of engine speed simulated pointer indication, engine is rapidly protected control function.

Description of drawings

Fig. 1 is the functional-block diagram of the utility model step motor type engine speed hour meter;

Fig. 2 is the circuit diagram of the utility model step motor type engine speed hour meter;

Fig. 3 is the structural drawing of the utility model step motor type engine speed hour meter;

Fig. 4 is the index dial figure of the utility model step motor type engine speed hour meter.

Specific implementation method

Describe performance of the present utility model in detail below in conjunction with accompanying drawing:

1 is instrument mask among the figure, and 2 is pointer, and 3 is index dial, and 4 is light guide sheet, and 5 is circuit board, and 6 is night light, and 7 is stepper motor, and 8 is axle, and 9 is the liquid crystal support, and 10 is liquid crystal, and 11 is conductive pole, and 12 is shell, and 13 is clamp.

From accompanying drawing as can be known: the core section the utility model stepper motor engine speed hour meter physical construction adopts hierarchy, can dwindle the volume of instrument like this, index dial is positioned on the light guide sheet and is connected by self-tapping screw with light guide sheet, circuit board is positioned under the light guide sheet, connect by self-tapping screw, liquid crystal support and liquid crystal are positioned on the circuit board and (are used for display digit rotating speed and accumulative total working time and operation and stop identifier), night light is positioned on the circuit board, impinge upon and make divergence of beam on the light guide sheet, make the index dial glazed thread even, soft.The conduction connecting link closely is connected with circuit board, and instrument power, tach signal, overspeed protection output, night illumination power supply all pass through the conduction connecting link and insert instrument.

The utility model stepper motor engine speed hour meter circuit is by Hall speed probe (being mainly used in speedometer) or magnetoelectricity speed probe and treatment circuit; all-night circuit; stabilized voltage supply; one-chip computer; the cumulative time memory circuit that the EEPROM electricity erasable memorizer is formed; lcd drive chip circuit and liquid crystal (show operation; shut down sign; the numeral rotating speed, the engine accumulative total working time etc.); the every circle umber of pulse of engine flywheel prewired circuit; the cumulative time clear circuit; the pointer rotating speed indication loop that stepper motor and pointer are formed is formed.

The utility model stepper motor engine speed hour meter circuit considers that the automobile surge voltage constitutes harmful effect to the element of instrument, added surge absorbing tube (TVS manages D2), the current drain of whole instrument has been considered in design simultaneously, the fluctuation range of voltage (the 16V-36V scope is a design object), keeping 5V three-terminal voltage-stabilizing power input voltage difference scope is 6.5V-26V, choose reasonable regulating resistor R1, the parameter of R2, three terminal regulator and resistive element had both been generated heat rationally, can keep 5V three-terminal voltage-stabilizing power input voltage scope again between 6.5V-26V, make the output of power supply keep stable 5V, thereby the operating voltage of instrument is worked in the scope of 16V-36V, do not influence the accuracy of instrument, the power-supply fluctuation that meets the automobile electric appliance system of stipulating in the national standard simultaneously is the scope of 20V to 30V.The 5V voltage-stabilized power supply circuit is made up of C1, D1, R1, C2, TVS pipe, C3, R2, C4, C5,5V three terminal regulator, C7, C8.Can make this power supply be used for the 12V automobile electric appliance system by the parameter of adjusting R1, R2.

Magnetoelectricity or Hall (mainly doing speedometer) speed probe D5, R80, R81, R82, R83, C80, T1 forms the sensor input circuit, obtain reflecting at the collector of T1 and the square-wave pulse signal of engine speed calculate engine speed by the one-chip computer measurement.

SW1, SW2, R70, R71 form the every circle umber of pulse of engine prewired circuit, and the various combination by SW1, SW2 can preset four kinds of different numbers of teeth, how can obtain more prevalue with several groups.

Eeprom chip is used to store the engine accumulative total working time.

SW3, R72 form engine accumulative total working time clear circuit.Be about to the working time zero clearing of engine accumulative total during connection.

D2, R90, D3, T2 form the racing of the engine alarm control circuit, are used to control an oil-break relay, excision oil circuit during hypervelocity.

Pointer stepper motor, R60, R61, R62, R63, C60, C61, C62, C63 and one-chip computer I/O mouth line link to each other, and form the needle deflection circuit, are used for simulated pointer indication engine speed.

Lcd drive chip PCF8562T chip, the liquid crystal that links to each other with one-chip computer is used for showing operation, stopping identifier that engine numeral rotating speed and engine accumulative total working time, its particular location is seen schematic diagram.

The P87LPC764 one-chip computer as whole instrument import, the core of output interface signal Processing.

Little lamp switch, D4, R50, R51, R52, D50, D51, D52, D53, D54, D55, D56 form instrument back lighting circuit.

Need to prove: to those of ordinary skill in the art; under the prerequisite that does not change the utility model principle, can make some changes or distortion to the utility model; as directly making speedometer (employing Hall element), removing liquid crystal and make tachometer gage, change index dial numeral, liquid crystal display character position etc., this belongs to protection domain of the present utility model equally.

Claims

1. step motor type engine speed hour meter, it comprises instrument mask (1), pointer (2), index dial (3), light guide sheet (4), circuit board (5), night light (6), stepper motor (7), axle (8), support (9), liquid crystal (10), conductive pole (11), shell (12), clamp (13) is characterized in that described circuit board (5) comprises magnetoelectric tachometric transducer, the tach signal treatment circuit, stabilized voltage supply, one-chip computer, the simulated pointer rotating speed indication loop that stepper motor and pointer are formed, the EEPROM electricity erasable memorizer, lcd drive chip, every circle number of teeth presets clear circuit, the protection control circuit at full speed that Computer I/O mouth is formed through power amplification, the whole instrument system that back lighting at night circuit is formed; Speed probe; the tach signal treatment circuit; one-chip computer; the pointer rotating speed indication loop that stepper motor and pointer are formed connects successively; the EEPROM electricity erasable memorizer; lcd drive chip and liquid crystal display; every circle number of teeth presets clear circuit and is connected on the one-chip computer; the protection control circuit at full speed that the I/O mouth of one-chip computer is formed through power amplifier is electrically connected successively; stabilized voltage supply is connected with one-chip computer with treatment circuit by the output branch road; the simulated pointer rotating speed indication loop that stepper motor and pointer are formed; the EEPROM electricity erasable memorizer; the lcd drive chip circuit; every circle number of teeth presets clear circuit; the protection control circuit at full speed that the I/O mouth of one-chip computer is formed through power amplifier; with the computing machine is that core is formed measurement; indication; show; control circuit, back lighting at night circuit is powered by system power supply.

2. step motor type engine speed hour meter according to claim 1, it is characterized in that described back lighting at night circuit and automobile lampet interlock, the lighting voltage of little lamp switch offers all-night circuit after diode is handled, pointer and index dial, liquid crystal etc. are thrown light on.

3. step motor type engine speed hour meter according to claim 1 is characterized in that described instrument mask (1) and shell (12) are fixing by clamp (14).