CN105318855A - Engine crankshaft position detection device - Google Patents

Abstract

The invention discloses an engine crankshaft position detection device, relating to the engine crankshaft position detection equipment technical field. The engine crankshaft position detection device comprises a magneto-electric sensor used for detecting engine crankshaft position data, and is characterized by at least comprising a photoelectric sensor used for detecting engine crankshaft position data; an AND gate circuit having two input terminals respectively electrically connected to the output terminal of the magneto-electric sensor and the output terminal of the photoelectric sensor; an anti-interference circuit used for filtering noise signals, and having the input terminal electrically connected to the output terminal of the And gate circuit; and a plug used for electrically connecting to the wiring harness of a whole vehicle, and electrically connected to the output terminal of the anti-interference circuit. The magneto-electric sensor and the photoelectric sensor are both installed on a crankshaft toothed disc. According to the technical scheme, the engine crankshaft position detection device possesses high detection precision.

Description

A kind of pick-up unit of engine crankshaft position

Technical field

The present invention relates to engine crankshaft position checkout equipment technical field, particularly relate to a kind of pick-up unit of engine crankshaft position.

Background technology

Engine crankshaft signals is as the of paramount importance tach signal of electric-control motor, extremely important to the effect of the startability of engine, unfailing performance, security performance, simultaneously in order to meet the reliable work of engine, therefore the engine crankshaft position sensor safety practice of car load must reliably put in place.Current simple magnetoelectric sensor is as the impact of crankshaft position sensor by crankshaft signal dish machining precision, the impact of assemblage gap, the impact of adsorption impurity, low engine speeds outputs signal low characteristic, (magnetoelectric tachometric transducer utilizes rotary body to change magnetic circuit, magnetic flux is changed, thus make its coil produce induced voltage, if rotating speed is very slow, it is also very slow that rotary body changes magnetic circuit, the change of magnetic flux is also very slow, induced voltage will be very little, correctly rotating speed is measured) with regard to acomia, therefore at the low rotational speed, there is stable output signal poor, reliability is low, the shortcomings such as low-response.

Summary of the invention

The technical problem to be solved in the present invention is: the pick-up unit providing a kind of engine crankshaft position.The pick-up unit of this engine crankshaft position adds electro-optical pickoff on the basis of traditional magnetoelectric sensor, and then can make up the deficiency of magnetoelectric sensor, improves the precision detected, and ensures the normal safe work of engine.

The technical scheme that the present invention takes for the technical matters existed in solution known technology is:

A pick-up unit for engine crankshaft position, comprises the magnetoelectric sensor (5) for detecting engine crankshaft position data; It is characterized in that: at least also comprise:

For detecting the electro-optical pickoff (4) of engine crankshaft position data;

AND circuit (3); Two input terminals of described AND circuit (3) are electrically connected with the lead-out terminal of magnetoelectric sensor (5), the lead-out terminal of electro-optical pickoff (4) respectively;

For the anti-jamming circuit (2) of filter out noise signal; The lead-out terminal of described AND circuit (3) is electrically connected with the input terminal of anti-jamming circuit (2);

For the plug (1) be electrically connected with overall wire sheaves; The lead-out terminal of described anti-jamming circuit (2) is electrically connected with plug (1);

Above-mentioned magnetoelectric sensor (5) and electro-optical pickoff (4) are installed on crank teeth wheel disc.

Further: described electro-optical pickoff (4) is LED light electric-type sensor.

The advantage that the present invention has and good effect are:

The mode that the present invention combines by adopting magnetoelectric sensor and electro-optical pickoff, feed back engine crankshaft position exactly, utilize the feature of LED light emitting diode and magnetoelectric sensor, corresponding electro-optical pickoff is coordinated to respond fast, there is brightness high, brightness constancy is good, reliability is high, power consumption less, the outstanding advantages such as fast, the excellent cost performance of response, thus improve startability, security performance, the unfailing performance of car load.

Accompanying drawing illustrates:

Fig. 1 is the circuit block diagram of the preferred embodiment of the present invention.

Wherein: 1, plug; 2, anti-jamming circuit; 3, AND circuit; 4, electro-optical pickoff; 5, magnetoelectric sensor.

Embodiment

For summary of the invention of the present invention, Characteristic can be understood further, hereby exemplify following examples, and coordinate accompanying drawing to be described in detail as follows:

Refer to Fig. 1, a kind of pick-up unit of engine crankshaft position, comprising:

For detecting the magnetoelectric sensor 5 of engine crankshaft position data;

For detecting the electro-optical pickoff 4 of engine crankshaft position data;

AND circuit 3; Two input terminals of described AND circuit 3 are electrically connected with the lead-out terminal of magnetoelectric sensor 5, the lead-out terminal of electro-optical pickoff 4 respectively;

For the anti-jamming circuit 2 of filter out noise signal; The lead-out terminal of described AND circuit 3 is electrically connected with the input terminal of anti-jamming circuit 2;

For the plug 1 be electrically connected with overall wire sheaves; The lead-out terminal of described anti-jamming circuit 2 is electrically connected with plug 1; Overall wire sheaves is connected with control unit of engine ECU;

Above-mentioned magnetoelectric sensor 5 and electro-optical pickoff 4 are installed on crank teeth wheel disc.

In above-mentioned specific embodiment: magnetoelectric sensor 5 and electro-optical pickoff 4 are the electronic devices and components of comparative maturity, AND circuit 3 and anti-jamming circuit 2 are prior art, it is more common in mimic channel, does not therefore repeat its particular circuit configurations herein.

Principle of work of the present invention is: engine crankshaft is in the process of rotating, magnetoelectric sensor 5 and electro-optical pickoff 4 detect engine crankshaft position simultaneously, wherein: magnetoelectric sensor 5 be detected as prior art, the testing process of electro-optical pickoff 4 is only described in detail in detail herein, photoelectric sensor launches light beam just on the tooth of engine crankshaft, engine crankshaft is in the process rotated, photoelectric sensor can receive a series of interrupted beam signal, be similar to pulse signal, such photoelectric sensor just exports a binary signal, the binary signal that this binary signal and magnetoelectric sensor 5 export carries out logic and operation, namely only have when both detect tooth signal (such as high level or low level) simultaneously, follow-up AND circuit 3 can export a tooth signal (such as high level or low level), when both have one tooth signal (such as high level or low level) not detected, follow-up AND circuit 3 can not export a tooth signal (such as high level or low level), which improves the precision problem of detection.

Further: described electro-optical pickoff 4 is LED light electric-type sensor, because electro-optical pickoff volume is little, lightweight, and with epoxy encapsulation, high-strength mechanical can be born impact and vibrations, not easily broken, and the brightness decay cycle is long, so its serviceable life is 50, 000-100, 000 hour, because the tenure of use of LED lamp can reach 5 ~ 10 years, so the cost of sensor replacement not only significantly can be reduced, luminous speciality can be driven again because it has minimum electric current, when same engine crankshaft position sensor effect, operating distance reaches 5 ~ 45mm, therefore the reliability of signal can be increased again, therefore novel engine crankshaft position sensor, have low engine speeds signal strong, the adaptability of environment temperature-30 ~+55, the advantage that operating distance is far away, engine is started at single axle, cold-starting, the performance of normal work is greatly improved.

Above embodiments of the invention have been described in detail, but described content being only preferred embodiment of the present invention, can not being considered to for limiting practical range of the present invention.All equalizations done according to the present patent application scope change and improve, and all should still belong within patent covering scope of the present invention.

Claims (2)

1. a pick-up unit for engine crankshaft position, comprises the magnetoelectric sensor (5) for detecting engine crankshaft position data; It is characterized in that: at least also comprise:

For detecting the electro-optical pickoff (4) of engine crankshaft position data;

AND circuit (3); Two input terminals of described AND circuit (3) are electrically connected with the lead-out terminal of magnetoelectric sensor (5), the lead-out terminal of electro-optical pickoff (4) respectively;

For the anti-jamming circuit (2) of filter out noise signal; The lead-out terminal of described AND circuit (3) is electrically connected with the input terminal of anti-jamming circuit (2);

For the plug (1) be electrically connected with overall wire sheaves; The lead-out terminal of described anti-jamming circuit (2) is electrically connected with plug (1);

Above-mentioned magnetoelectric sensor (5) and electro-optical pickoff (4) are installed on crank teeth wheel disc.

2. the pick-up unit of engine crankshaft position according to claim 1, is characterized in that: described electro-optical pickoff (4) is LED light electric-type sensor.