CN2226146Y

CN2226146Y - Gasoline pressure sound alarm for automobile engine

Info

Publication number: CN2226146Y
Application number: CN 95216854
Authority: CN
Inventors: 武树田; 宋殿勇
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-10-05
Filing date: 1995-10-05
Publication date: 1996-05-01
Anticipated expiration: 2005-10-05

Abstract

The utility model relates to a gasoline pressure sound alarm for automobile engines. The gasoline pressure sound alarm for automobile engines is composed of an indicating lamp, a pressure switch, a resistance voltage divider, a voltage comparator of integrated CMOS pieces, an oscillator, a gating circuit, a driver, a reference voltage circuit composed of a voltage-stabilizing resistance and a divider resistance, and a sound component which are connected. When an automobile engine is used for starting, the rotary speed is raised from zero to a certain value, and the operating condition of an automobile engine is showed by the relationship that the output voltage of the automobile engine is started to rise from the battery voltage. Therefore, when the automobile engine is ignited without starting, and the speed is idled, the gasoline pressure sound alarm for automobile engines can not warn by sound; when the automobile engine runs in over moderate speed, the gasoline pressure sound alarm for automobile engines can warn by sound when once the gasoline pressure drops. The utility model has the characteristic of reliable warning.

Description

Motor car engine engine oil pressure acoustic alarm

The utility model relates to a kind of signals of vehicles device, relates to a kind of warning device of indicating the motor car engine engine oil pressure or rather.

At present, the engine oil pressure of motor car engine is provided with the oil indicator that is attempted by between ignition switch and ground again and crosses low warning with the series circuit of pressure switch (motor car engine place) as engine oil pressure generally by pressure gauge indication.Because the driver needs high concentration energy often ignore the observation instrument in driving, in case though oil pressure cross and lowly have tutorial light to show also to be difficult in time discovering.And cross low or when being zero, can in short a few minutes, burn out bent axle and bearing shell when oil pressure appears in motor, cause serious economy loss.For avoiding this type of accident to take place, the applicant is in 95206261.5 Chinese patents, a kind of " motor car engine engine oil pressure acoustic alarm " disclosed, promptly at the pressure indicator light two ends and connect one and connect the acoustic alarm that transistor switching circuit and buzzer load constitute by resitstance voltage divider, when engine motor oil pressure be lower than certain value (as 0.06～0.1MPa) time, send sound simultaneously, light is reported to the police.

But owing to adopt transistor switching circuit and use the reference diode of a plurality of serial connections in the input circlult of switching circuit, thereby the sensitivity of circuit and temperature characteristic are relatively poor; Because all adopt discrete component, the conformity of circuit is relatively poor, also gives and transfer the certain difficulty of measuring tape.

The purpose of this utility model is that above-mentioned patented technology is made improvements design, and acoustic alarm is quick on the draw, good temp characteristic, high conformity.

Motor car engine engine oil pressure acoustic alarm of the present utility model comprises engine oil pressure tutorial light and the motor car engine Oil pressure switch that is connected in series with it thereof, is attempted by between ignition switch and ground, it is characterized in that:

Also comprise one by resitstance voltage divider, reference voltage circuit, voltage comparator, oscillator, gating circuit, driver and the acoustic alarm that connects and composes as the sounding component of driver load, described resitstance voltage divider and described reference voltage circuit are attempted by described engine oil pressure tutorial light two ends, the dividing point of resitstance voltage divider and the output terminal of reference voltage circuit connect the homophase of described voltage comparator respectively, inverting input, described oscillator output and voltage comparator output connect gating circuit two input ends, the driver connected input end of described gating circuit output terminal respectively.

Described voltage comparator, oscillator, gating circuit and driver are CMOS intergrated circuit.

When motor car engine was started, rotating speed was brought up to certain value by zero, and the motor output voltage is begun to rise by battery voltage, and the utility model promptly utilizes this relation to reflect the working speed of motor, also is operating mode.

When operation during ignition switch, though engine motor oil pressure does not exist, because of the pressure switch closure, the output state of voltage comparator is closed gating circuit, so alarm do not have sound equipment and report to the police, and has only the engine oil pressure tutorial light to light; When automobile was in idling, though ignition switch closure, pressure switch fashionable opening also the time, the output state of voltage comparator still made gating circuit close, so alarm does not have sound equipment and reports to the police the yet interrupted light on and off of engine oil pressure tutorial light; When turning round more than the medium engine speed, engine oil pressure is then pressure switch disconnection normally, alarm does not have working power and does not have the acousto-optic warning, in case this moment, engine oil pressure reduced by 0.06～0.1MPa or following, the closed power circuit of connecting alarm of pressure switch, the output state of voltage comparator is opened gating circuit, and oscillator output signal sends sound, light warning simultaneously through gating circuit, driver drives sounding component.

Further specify technology of the present utility model below in conjunction with embodiment's accompanying drawing

Fig. 1. motor car engine engine oil pressure acoustic alarm electrical schematic diagram

Fig. 2. the CMOS IC logic figure of voltage comparator, gating circuit, oscillator and driver among Fig. 1.

Referring to Fig. 1 .K1 is automobile ignition switch, and K2 is a pressure switch, and M is the low oil pressure tutorial light, and K1, K2, M are the existing device on the present automobile.

10 is integrated of CMOS, comprises voltage comparator 11, oscillator 12, gating circuit 13 and driver 14.R1, R2 constitute resitstance voltage divider, its dividing point connects the normal phase input end of voltage comparator 11, R5, C2 are used to adjust the oscillation frequency of oscillator 12,20 is the three-terminal voltage-stabilizing device, output 9V provides power vd D and provides reference potential through divider resistance R3, R4 to the inverting input of voltage comparator 11 to integrated 10.Sounding component 30 can be used buzzer, loudspeaker etc.

Ignition switch K1 closure is because of no oil pressure event K2 closure, because of so motor does not start VA＜12.9V, voltage comparator two input end V-＞V+, gating circuit 13 is closed, and no sound equipment is reported to the police, the design of this function is to obscure with other warnings of automobile for avoiding, as the warning of car door, safety strip etc.

Automobile starts, but when being in idling mode, the K1 closure, K2 intermittently opens and closes, the interrupted light on and off of M, the about 13V of generator voltage is a little more than battery voltage, but VA＜13.2V, voltage comparator two input ends are still kept V-＞V+, gating circuit 13 is closed, no sound equipment is reported to the police, because the general engine oil pressure that allows changes in the scope of 0.06～0.1MPa during idling, thereby not report to the police also be normal.

Automobile has started and has been in when middling speed is above to turn round, and the about 14V of generator voltage is higher than battery voltage 2V, just often because of K2 disconnects, has cut off the power loop of warning circuit at engine oil pressure, and noiseless, light is reported to the police; But be reduced to 0.06～0.1MPa or when following at engine oil pressure, the K2 closure is lighted M and is connected the warning circuit power supply, this moment, voltage comparator two input ends were kept V-＜V+ because of VA＞13.2V, gating circuit 13 is opened, oscillator signal drives sounding component 30 sounding through gating circuit 13, driver 14, and sound, light are reported the state that oil pressure is low excessively simultaneously.

Referring to Fig. 2. be integrated 10 cmos circuit logic design figure, each frame of broken lines 11,12,13,14 is respectively the standard CMOS logical circuit of voltage comparator, oscillator, gating circuit, driver.

The utility model adopts voltage comparator, and reaction sensitivity height, good temp characteristic, and critical piece is produced in the integrated chip have improved functional reliability and stability, and is easy to use and transfer and survey.

Claims

1. a motor car engine engine oil pressure acoustic alarm comprises engine oil pressure tutorial light and the motor car engine Oil pressure switch that is connected in series with it thereof, is attempted by between ignition switch and ground, it is characterized in that:

Also comprise one by resitstance voltage divider, reference voltage circuit, voltage comparator, oscillator, gating circuit, driver and the acoustic alarm that connects and composes as the sounding component of driver load; Described resitstance voltage divider and described reference voltage circuit are attempted by described engine oil pressure tutorial light two ends, the dividing point of resitstance voltage divider and the output terminal of reference voltage circuit connect homophase, the inverting input of described voltage comparator respectively, described oscillator output and voltage comparator output connect gating circuit two input ends, the driver connected input end of described gating circuit output terminal respectively.

2. motor car engine engine oil pressure acoustic alarm according to claim 1 is characterized in that: