CN201730677U

CN201730677U - Automobile electronic temperature sensor

Info

Publication number: CN201730677U
Application number: CN2010202662615U
Authority: CN
Inventors: 刘慧林; 田力; 郭廷华
Original assignee: HEBI CITY HUAMEI ELECTRIC FACTORY
Current assignee: HEBI CITY HUAMEI ELECTRIC FACTORY
Priority date: 2010-07-16
Filing date: 2010-07-16
Publication date: 2011-02-02
Anticipated expiration: 2020-07-16

Abstract

The utility model discloses an automobile electronic temperature sensor which is used for detecting the temperature of cooling water of an automobile engine and has the alarm function when the temperature of the cooling water is overhigh; a probe (5) is arranged on a probe rod (4) and is positioned at the left inner side of a shell (1) by a screw rod (3); a fixed pipe (6) is arranged at one side of the shell (1); a lead plug bush (2) is arranged at the upper part of the shell (1), and the left inner end of the lead plug bush is provided with an inserting rod (12); a cover plate (7) is installed at the right end of the shell (1); and a sensing control mechanism is arranged in the shell (1). By adopting an advanced integrated circuit, the automobile electronic temperature sensor can directly output a digital signal, is novel in the designed shape and structure, has the functions of time delay and alarm, can be adjusted according to the different demands and water quality, and is safe, reliable, high in sensitivity and stable in performance; and a temperature switch is switched on when the water temperature is lower than -3 DEG C, and is switched off when the water temperature is higher than +5 DEG C, so that the automobile electronic temperature sensor is high in detection accuracy.

Description

The auto electronic temperature transducer

Technical field: the utility model relates to a kind of temperature that is used for detecting automobile engine cooling water, and has the auto electronic temperature transducer of warning function when cooling water temperature is too high.

Background technique: at present, the cooling-water temperature sensor of being joined on the domestic automobile motor, the main thermistor that adopts is as temperature-sensing element (device), direct again simultaneously the load resistance of thermistor as the secondary meter loop, big by electric current, consumed power is big, and its self-heating effect has the influence that can not be ignored to temperature measurement accuracy, non-linear relation between its resistance value and the temperature variation during thermosensitive resistance measurement temperature in addition, the index error that is directed at gauge pointer is bigger.In addition, the high temperature alarm method that temperature transducer adopts on the domestic automobile motor mainly is to adopt the bimetallic strip thermal switch at present, and its shortcoming is a complex structure, and precision and reliability are all undesirable.

The model utility content: the utility model has overcome the drawback that former alarm exists, and a kind of have time-delay and warning function are provided, and is safe and reliable, highly sensitive, the auto electronic temperature transducer of stable performance.The technological scheme that the utility model technical solution problem is adopted is: described probe 5 is arranged on the feeler lever 4, and it is inner to be arranged on shell 1 left side by screw rod 3, fixed tube 6 is arranged on shell 1 one sides, lead sleeve 2 is arranged on shell 1 top, its left the inner is provided with inserted link 12, cover plate 7 devices are at shell 1 right-hand member, and the sensing control mechanism arrangement is in shell 1 inside.

The beneficial effects of the utility model are: owing to adopt advanced intergrated circuit, can directly export digital signal, designed novel shape and structure, had time-delay and warning function, can adjust according to different demands and water quality, safe and reliable, highly sensitive, stable performance, thermal switch closure when water temperature is lower than-3 ℃, water temperature is higher than+and thermal switch disconnects the testing precision height 5 ℃ the time.

Description of drawings: Fig. 1 is a plan view of the present utility model

Fig. 2 is the left view of Fig. 1

Fig. 3 is the circuit diagram of Fig. 1

Embodiment: as shown in Figure 1 and Figure 2, described probe 5 is arranged on the feeler lever 4, and it is inner to be arranged on housing 1 left side by screw rod 3, fixed tube 6 is arranged on housing 1 one sides, lead sleeve 2 is arranged on housing 1 top, its left the inner is provided with inserted link 12, and cover plate 7 devices are at housing 1 right-hand member, and the sensing control mechanism arrangement is in housing 1 inside.

As shown in Figure 1 and Figure 2, the heat responsive element 11 of described sensing control mechanism is welded on the right-hand member of circuit board 8, the one utmost point is connected with wire column 12 by first conducting plate 10, and is arranged on the top of housing 1, another utmost point and pass through second conducting plate 9 and be connected with two probes 5.

As shown in Figure 3, the circuit of described circuit board 8 is made up of triangular-wave generator 13, temperature detection amplification circuit 14, voltage comparator 15 and executive circuit 16; In the circuit, power supply 12V is supplied with by car oneself; By amplifier A ₁The triangular-wave generator of forming 13 comprises VT ₁, VT ₂, voltage stabilizing is the voltage-stabiliser tube of 3.3V, and the constant-current source circuit of triode and resistance composition, this constant-current source circuit passes through VD ₃, VD ₄, VD ₅, VD ₆To the capacitor C constant-current charge, the index law of the charging voltage on the capacitor C is risen; By A ₂The charging voltage of amplifying, its output voltage range between-the 6V, is worked as A at+6V ₂Output voltage is timing, the capacitor C charging, and its charging current equals constant current and adds feedback current, works as A ₂When output voltage is negative, the capacitor C discharge; By amplification circuit and feeder loop acting in conjunction, the exponential relationship that capacitor C is discharged and recharged becomes linear triangle relation, i.e. pyramidal wave; By A ₁The pyramidal wave of output is through R ₁₃, R ₁₄Add to voltage comparator A after the dividing potential drop ₄15 in-phase end and pyramidal wave together add to A ₄Also having of in-phase end through R ₁₈, RP ₂The fixed voltage that dividing potential drop is regulated is through RR ₂Regulate and get final product; Integrated temperature sensor and amplifier A ₃Form temperature detection amplification circuit 14, by A ₃The temperature measurement signal of output is through R ₈Add to A ₄Inverting input; By A ₄The pulse signal of output adds to power field effect pipe VT ₃The executive circuit 16 formed of grid, make VT ₃Do continual open and close control, constantly obtain heating current, keep the heating temperature constant for heating element.

Claims

1. auto electronic temperature transducer, it is characterized in that probe (5) is arranged on the feeler lever (4), and it is inner to be arranged on housing (a 1) left side by screw rod (3), fixed tube (6) is arranged on housing (1) one side, lead sleeve (2) is arranged on housing (1) top, its left the inner is provided with inserted link (12), and cover plate (7) installs at housing (1) right-hand member, and the sensing control mechanism arrangement is in housing (1) inside.

2. auto electronic temperature transducer as claimed in claim 1, it is characterized in that the heat responsive element (11) of sensing control mechanism is welded on the right-hand member of circuit board (8), the one utmost point is connected with wire column (12) by first conducting plate (10), and be arranged on the top of housing (1), another utmost point and be connected with two probes (5) by second conducting plate (9).

3. auto electronic temperature transducer as claimed in claim 1 is characterized in that the circuit of circuit board (8) is made up of triangular-wave generator (13), temperature detection amplification circuit (14), voltage comparator (15) and executive circuit (16); In the circuit, power supply 12V is supplied with by car oneself; By amplifier A ₁The triangular-wave generator of forming (13) comprises VT ₁, VT ₂, voltage stabilizing is the voltage-stabiliser tube of 3.3V, and the constant-current source circuit of triode and resistance composition, this constant-current source circuit passes through VD ₃, VD ₄, VD ₅, VD ₆To the capacitor C constant-current charge, the index law of the charging voltage on the capacitor C is risen; By A ₂The charging voltage of amplifying, its output voltage range between-the 6V, is worked as A at+6V ₂Output voltage is timing, the capacitor C charging, and its charging current equals constant current and adds feedback current, works as A ₂When output voltage is negative, the capacitor C discharge; By amplification circuit and feeder loop acting in conjunction, the exponential relationship that capacitor C is discharged and recharged becomes linear triangle relation, i.e. pyramidal wave; By A ₁The pyramidal wave of output is through R ₁₃, R ₁₄Add to voltage comparator A after the dividing potential drop ₄(15) in-phase end and pyramidal wave together add to A ₄Also having of in-phase end through R ₁₈, RP ₂The fixed voltage that dividing potential drop is regulated is through RR ₂Regulate and get final product; Integrated temperature sensor and amplifier A ₃Form temperature detection amplification circuit (14), by A ₃The temperature measurement signal of output is through R ₈Add to A ₄Inverting input; By A ₄The pulse signal of output adds to power field effect pipe VT ₃The executive circuit (16) formed of grid, make VT ₃Do continual open and close control, constantly obtain heating current, keep the heating temperature constant for heating element.