CN202216657U

CN202216657U - Magnetoelectric crankshaft position sensor

Info

Publication number: CN202216657U
Application number: CN2011203648889U
Authority: CN
Inventors: 陈其华
Original assignee: WENZHOU WEILI AUTO PARTS CO Ltd
Current assignee: WENZHOU WEILI AUTO PARTS CO Ltd
Priority date: 2011-09-23
Filing date: 2011-09-23
Publication date: 2012-05-09
Anticipated expiration: 2021-09-23

Abstract

The utility model discloses a magnetoelectric crankshaft position sensor, which includes a magnetic tank (3), an induction coil (4) and an excitation coil (1), wherein the induction coil (4) is mounted at the center of the magnetic tank (3), and the excitation coil (1) is wound on the outer surface of the magnetic tank (3). The magnetoelectric crankshaft position sensor is characterized in that a flange (5) is arranged at the bottom of the magnetic tank (3). By arranging the flange arranged at the bottom of the magnetic tank, the magnetic circuit generated by the excitation coil is changed, the magnetic field intensity of the area where the induction coil is arranged is improved, and the sensitivity of the sensor is enhanced; the crankshaft position of the automobile engine is precisely detected, and the signals thereof can be used for precisely controlling the fuel injection time, the fuel injection amount and the ignition duration of the automobile engine through the ECU (Engine Control Unit); and the magnetoelectric crankshaft position sensor of the structure is particularly applicable to sedans as BMW and Opel.

Description

The magneto-electric crankshaft position sensor

Technical field

The utility model relates to a kind of sensor that can detect the automobile engine crankshaft position.

Background technology

As everyone knows; Motor car engine adopts that the carburetor fuel spray regime is accurately controlled in air-fuel ratio, have inadequate natural endowment aspect each cylinder oil mass distributing uniformity and the response performance; Disadvantage is accurately to control the concentration of combination gas; Cause incomplete combustion, objectionable constituent increase in the waste gas, do not meet the strict demand of current environmental protection.For addressing these problems, the petrol engine electron controls technology can compensate its defect to a great extent.This technology comprises control fuel injection and high energy beakless ignition; Can accurately control distributive value and time of ignition, the fuel delivery under the various operating modes of engine is optimized, remove the throttling action of carburetor air inlet; Improve inflation and imitated the road; Oil consumption is descended significantly, and discharging obviously improves, simultaneously for adopting air-fuel ratio to need the tail gas three-way catalytic converter of accurately control that condition is provided.The petrol engine electronic control system comprises ECU, various sensor (temperature, position, air mass flow, oxygen, pinking etc.) and topworks's (fuel pump, atomizer, distributing pipe, oil pressure regulator etc.).Crankshaft position sensor is called for short CKP, is sensor important in the computer-controlled firing system, and its effect is to detect top dead centre signal, corner signal and engine rotational speed signal.Because crankshaft position sensor is mounted near the engine, its environment temperature is very high, makes the Hall-type electronic sensor to use.Look into the Chinese patent database; Obtaining a patent No. is No. 200520010337.7, and name is called the utility model patent of " magneto-electric crankshaft position sensor ", discloses following content: a kind of sensor that need not WV; In insulation crust; Conducting magnet core, inductive coil, magnet steel are housed in order, it is characterized in that: conducting magnet core is connected with magnet steel and is placed in the inductive coil, and two output terminals of inductive coil are connected with the shielding stube cable.Wherein magnet steel adopts resistant to elevated temperatures samarium cobalt permanent magnet.The crankshaft position sensor of this structure, owing to adopt permanent magnetic steel, though anti-certain high temperature, it is not long to be mounted near the life-span of engine yet, particularly is installed on the automobile of brands such as BMW or Opel, more can not be suitable for.

For this reason; Those skilled in the art have developed a kind of crankshaft position sensor of full magneto-electric; As shown in Figure 1, this sensor comprise magnetic jar 3 ', field coil 1 ' and inductive coil 4 ', inductive coil 4 ' be installed in magnetic jar 3 ' central authorities; Field coil 1 ' around magnetic jar 3 ' outside surface, wherein magnetic jar 3 ' outside surface is cylindrical.The sensor of this structure has solved the problem of hall sensor or the existence of magneto sensor in theory.But because field coil 1 ' around magnetic jar 3 ' outside surface, leakage field is bigger, cause magnetic field intensity a little less than; Be installed on BMW or the Opel automobile, will send warning signal, because employing all is vehicle-mounted voltage; So under the certain situation of voltage, have only the diameter that increases field coil 1 ' lead, but this sensor receives the restriction of size again; Make field coil 1 ' diameter of wire can not be too big; And field coil 1 ' the number of turn again can not be too many, this with regard to determined to increase field coil 1 ' magnetic field intensity have certain difficulty, therefore; Under the fixing situation of diameter of wire and the number of turn, how to improve field coil 1 ' magnetic field intensity just become solution key of problem place.Therefore, the most directly mode that those skilled in the art adopt be make again in magnetic jar outside a circle annulus 5 ', as shown in Figure 2, to increase the magnetic circuit at field coil center.But, like this since, also increased the size of sensor, and field coil 1 ' also difficulty comparatively of coiling, the technology difficulty of making is very big.

Summary of the invention

In view of the deficiency that background technology exists, the technical matters that the utility model will solve provides a kind of simple in structure, reduces the leakage field phenomenon to improve the magneto-electric crankshaft position sensor of magnetic field intensity.For this reason; The utility model adopts following technical scheme to realize: a kind of magneto-electric crankshaft position sensor; Comprise magnetic jar, inductive coil and field coil; Said inductive coil is installed in the central authorities of magnetic jar, and said field coil is characterized in that around the outside surface of magnetic jar the bottom of said magnetic jar has flange.

The utility model is as long as increase flange in the bottom of magnetic jar; The magnetic circuit that makes field coil produce is stopped by flange; In the inductive coil zone, concentrate; The magnetic field intensity that so just field coil is produced strengthens in the inductive coil zone, thereby reaches the position and the angle of effective detection of engine bent axle, through ECU injection time, distributive value and the time of ignition of engine is controlled; Have the high and accurate characteristics of detection of detection sensitivity, be specially adapted on the car of foreign brand names such as BMW and Opel.

Description of drawings

Combine accompanying drawing to further describe the relevant details of the utility model below again.

Fig. 1 is the structural drawing of sensor in the background technology;

The sensor construction figure of Fig. 2 for imagining in the background technology;

Fig. 3 is the structural representation of the utility model;

Fig. 4 is the magnetic circuit synoptic diagram that the utility model background technology sensor produces;

The magnetic circuit synoptic diagram that Fig. 5 produces for the utility model.

Embodiment

With reference to accompanying

drawing

3,5, this magneto-electric crankshaft position sensor comprises magnetic jar 3, inductive coil 4 and field coil 1; Said inductive coil 4 is installed in the central authorities of magnetic jar 3, and said field coil 1 is around the outside surface of magnetic jar 3, and the bottom of said magnetic jar 3 has flange 5; After magnetic jar 3 bottoms are provided with flange 5; The magnetic circuit that field coil 1 produces is stopped, and in the zone of inductive coil 4 is installed, magnetic circuit is concentrated, and has so just strengthened magnetic field intensity.When engine crankshaft rotates; When the signal teeth 2 on the bent axle turns to the openend of magnetic jar 3, the magnetic line of force is cut, on inductive coil 4, produce electromotive force; Because the enhancing of magnetic field intensity; The electromotive force of its generation is also higher, when detecting crank position and angle, can satisfy the requirement in the design like this.After this magneto-electric crankshaft position sensor detects the position and angle signal of bent axle; Signal is delivered to ECU; After the signal that ECU combines other sensor to transmit carries out comprehensive evaluation; The output control signal is controlled injection time, distributive value and the time of ignition of engine, to reach the purpose of energy-conserving and environment-protective.This sensor of the utility model, it is simple in structure, reduces the interference of leakage field and others, has improved magnetic field intensity, and is very practical, is specially adapted to the car of foreign brand names such as BMW and Opel.

Claims

1. magneto-electric crankshaft position sensor; Comprise magnetic jar (3), inductive coil (4) and field coil (1); Said inductive coil (4) is installed in the central authorities of magnetic jar (3), and said field coil (1) is characterized in that around the outside surface of magnetic jar (3) bottom of said magnetic jar (3) has flange (5).