CN101393036A - Non-contact clutch position sensor - Google Patents

Abstract

The invention relates to a position sensor for a non-contact clutch, which solves the problems that the poor contact existing in the prior position sensor of the non-contact clutch leads to poor operational reliability and so on, The position sensor for the non-contact clutch comprises a shell, a rotor, a circuit board and so on, wherein a magnetic steel ring is arranged in the cylindrical rotor, the inner wall of the magnetic steel ring is symmetrically provided with two permanent magnet blocks respectively, and a cavity is formed between the two permanent magnet blocks; and the middle part of the circuit board is connected with an A Hall chip and a B Hall chip through two conducting member bars respectively, and the A Hall chip and the B Hall chip are positioned in the cavity between the two permanent magnet blocks. The sensor solves the problem of contact wear and prolongs service life; the sensor has good linear output characteristic and ensures that an output signal is more accurate and stable; the adopted Hall chips have functions of programmable property and temperature compensation, can flexibly change parameters of output voltage according to the requirement of customers, and automatically compensate and calibrate the magnetic field drift when the magnetic field intensity of a magnet drifts with the change of the temperature.

Description

Non-contact clutch position sensor

Technical field

The present invention relates to the automobile clutch position transducer.

Background technology

Electronic brake technology EBP (Electrical Brake Park) is meant the provisional braking in the driving process and the long time property braking function after stopping combines, and is realized the technology of stopping brake by electronic control mode.Brake hard if desired, the driver only need press " EBP " key on the console, and vehicle will produce maximum damping force to four wheels simultaneously by the hydraulic action of ESP, allows automobile steadily stop in the shortest distance; Simultaneity factor can apply braking automatically after flame-out; Improve the car load security performance, effectively prevented " slipping sloping ", under dynamic and quiescent conditions, guaranteed vehicle and personal security.

Clutch position sensor is to be used for detecting the clutch pedal angular displacement signal, simultaneously signal is input to the device of EBP system electric-controlled unit.Clutch position sensor is the important component part of EBP system, is that the signal that control EBP system opens and closes one of is originated.Present widely used clutch position sensor adopts metallic brush and the sliding contact of ceramic resistor substrate to change resistance value mostly, thereby changes output voltage signal.The contact clutch position sensor frequently slides owing to the contact, parts are easy to generate wearing and tearing, come in contact the phenomenons such as deviation of bad or output resistance easily, cause the signal can't normal transmission, be restricted serviceable life, and owing to the vibration of automobile, contact chip may produce moment disengagement, loose contact simultaneously, thereby cause sensor failure, damage, and the output linearity also is difficult to control.

Summary of the invention

Problems such as functional reliability difference for the loose contact that solves the existence of contact clutch position sensor causes the invention provides a kind of non-contact clutch position sensor

Concrete improvement technical scheme is as follows:

Non-contact clutch position sensor comprises housing, upper cover plate and back shroud, is provided with rotor and wiring board in the housing, and wiring board is corresponding with the back shroud medial surface, and the connection terminal that is connected with wiring board extends outside the housing;

Described rotor is the cylindrical tube of axial end sealing, is provided with the magnet steel circle in the rotor, and magnet steel circle inwall is arranged with two permanent magnet blocks respectively, forms a cavity between two permanent magnet blocks; The wiring board middle part is connecting A Hall chip and B Hall chip respectively by two conductor rod members, in A Hall chip and the cavity of B Hall chip between two permanent magnet blocks;

The blind end of described rotor is corresponding with the upper cover plate medial surface, and the other end lateral surface of rotor is provided with a projection.

The present invention adopts the change of the relative angle of A Hall chip, B Hall chip and A permanent magnet blocks, B permanent magnet blocks, thereby reach the purpose that changes sensor output voltage, be in contactless state between A Hall chip, B Hall chip and A permanent magnet blocks, the B permanent magnet blocks, get up by the magnetic field shielding of magnet steel circle, guarantee by A Hall chip and the magnitude of field intensity of B Hall chip and the stability of field signal with A permanent magnet blocks, B permanent magnet blocks.

Useful technique effect of the present invention is embodied in following several aspect:

1, this sensor has solved the contact wear problem, has prolonged mission life greatly; 2, this sensor has the favorable linearity output characteristics, makes output signal more accurate and more stable; 3, the Hall chip of this sensor employing has programmable functions, can change output voltage parameter flexibly according to requirement of client; 4, the Hall chip that adopts of this sensor has temperature compensation function, and when the magnetic field intensity of magnet was drifted about along with variation of temperature, chip can be automatically compensates and proofreaies and correct the drift in magnetic field.This project market application foreground is very wide, can substitute traditional contact contacting type EGR sensor on a large scale, especially in the application of automotive electronics, this product can change shortcomings such as traditional touch sensor life-span weak point, failure rate height, will increase substantially the reliability and the security of system.

Description of drawings

Fig. 1 is a structural representation of the present invention,

Fig. 2 assembles explosive view for the present invention,

Fig. 3 is the A-A cut-open view of Fig. 1,

Fig. 4 uses scheme of installation for the present invention.

Embodiment

Below in conjunction with accompanying drawing, the present invention is further described by embodiment.

Embodiment:

Referring to Fig. 1, Fig. 2, non-contact clutch position sensor comprises housing 1, upper cover plate 3 and back shroud 11, and rotor 2 and wiring board 9 are installed in the housing 1, and wiring board 9 is corresponding with back shroud 11 medial surfaces, and the connection terminal 10 that is connected with wiring board 9 extends outside the housing;

Rotor 2 is the cylindrical tube of axial end sealing, and magnet steel circle 4 is installed in the rotor 2, and magnet steel circle 4 inwalls are symmetrically installed with A permanent magnet blocks 5 and B permanent magnet blocks 8 respectively, forms a cavity between A permanent magnet blocks 5 and the B permanent magnet blocks 8; Wiring board 9 middle parts are connecting A Hall chip 6 and B Hall chip 7 respectively by two conductor rod members, in A Hall chip 6 and B Hall chip 7 cavity between A permanent magnet blocks 5 and B permanent magnet blocks 8;

The blind end of rotor 2 is corresponding with the upper cover plate medial surface, and the other end lateral surface of rotor 2 is provided with a projection.

The present invention adopts the change of the relative angle of A Hall chip 6, B Hall chip 7 and A permanent magnet blocks 5, B permanent magnet blocks 8, thereby reach the purpose that changes sensor output voltage, be in contactless state between A Hall chip 6, B Hall chip 7 and A permanent magnet blocks 5, the B permanent magnet blocks 8, get up by the magnetic field shielding of magnet steel circle 4, guarantee by A Hall chip 6 and the magnitude of field intensity of B Hall chip 7 and the stability of field signal with A permanent magnet blocks 5, B permanent magnet blocks 8.

Principle of work of the present invention is as follows:

This sensor is installed on the clutch pedal assembly, as shown in Figure 4, rotate synchronously by the 12 drive rotor sensors 2 of the rotating shaft on the clutch pedal, magnet steel circle 4 and A permanent magnet blocks 5 and B permanent magnet blocks 8, thereby change the relative angle between A permanent magnet blocks 5, B permanent magnet blocks 8 and A Hall chip 6, the B Hall chip 7, utilize Hall effect, be the output voltage of Hall element and the proportional relation principle of cosine of externally-applied magnetic field and the magnetic line of force and Hall element normal angle, for different angle output correspondent voltage signals.This sensor comes the linear output character of control module by software programming, and compensation and the suppress interference, fluctuation and the drift that are caused by environment, temperature factor, guarantees the independent linearity and the signal stabilization of sensor output signal.

Claims (1)

1, non-contact clutch position sensor comprises housing, upper cover plate and back shroud, is provided with rotor and wiring board in the housing, and wiring board is corresponding with the back shroud medial surface, and the connection terminal that is connected with wiring board extends outside the housing, it is characterized in that:

Described rotor is the cylindrical tube of axial end sealing, is provided with the magnet steel circle in the rotor, and magnet steel circle inwall is arranged with two permanent magnet blocks respectively, forms a cavity between two permanent magnet blocks; The wiring board middle part is connecting A Hall chip and B Hall chip respectively by two conductor rod members, in A Hall chip and the cavity of B Hall chip between two permanent magnet blocks;

The blind end of described rotor is corresponding with the upper cover plate medial surface, and the other end lateral surface of rotor is provided with a projection.

Images