CN2846782Y

CN2846782Y - Magneto electric type crankshaft position sensor

Info

Publication number: CN2846782Y
Application number: CN 200520010337
Authority: CN
Inventors: 陈鲸
Original assignee: CHONGQING CHANG'AN CHIYEUNG AUTOMOTIVE ELECTRICS Co Ltd
Current assignee: CHONGQING CHANG'AN CHIYEUNG AUTOMOTIVE ELECTRICS Co Ltd
Priority date: 2005-11-18
Filing date: 2005-11-18
Publication date: 2006-12-13
Anticipated expiration: 2015-11-18

Abstract

The utility model relates to a sensor which can be used for detecting the top dead point of a bent shaft and the rotating speed signal of the bent shaft. The utility model is composed of an induction coil, a magnetism conducting iron core, magnetic steel, a shield connecting cable and an insulation housing. The utility model does not need no operating voltage or contact a signal wheel. When the signal wheel rotates, test signals can be obtained at the output end of a shielded cable. The utility model is used as a position signal sensor for a bent shaft, and is also used as a wheel speed sensor and a speed sensor.

Description

The magnetoelectric crankshaft position sensor

Affiliated technical field

The utility model relates to a kind of sensor that can detect crankshaft for gasoline engine angle position and tach signal, the BOSCH electronic fuel injection system that especially four cylinder engine mated.

Background technique

As everyone knows, motor car engine adopts that the carburetor fuel spray regime is accurately controlled in air fuel ratio, exist inadequate natural endowment aspect each cylinder oil mass distributing uniformity and the response performance, disadvantage is accurately to control the concentration of mixed gas, cause incomplete combustion, harmful components increase in the waste gas, do not meet the strict demand of current environmental protection.In addition, because the existence of trunnion increases intake resistance; Also exist each cylinder and distribute gasoline inhomogeneous, phenomenon such as easily produce vapour lock and freeze.

Summary of the invention

In order to solve above-mentioned these problems, petrol engine electron controls technology (claiming engine management system EMS again) can largely compensate its defect.This technology comprises control fuel injection (EFI) and high energy beakless ignition, can accurately control fuel injection quantity and time of ignition, the fuel delivery under the various operating modes of motor is optimized, removed the throttling action of Carburetor to air inlet, improve inflation and imitated the road, oil consumption is descended significantly, 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: micro computer central unit ECU, various sensor (temperature, position, air mass flow, oxygen, pinking etc.) and actuator's (fuel pump, oil nozzle, distribution piping, oil pressure regulator etc.).Crankshaft position sensor (being called for short CKP) is a sensor important in the computer-controlled ignition system, and its effect is to detect top dead center signal, corner signal and engine rotational speed signal.

The purpose of this utility model just provides bent axle top dead center signal important in the computer-controlled ignition system, and with its input computer, thereby make computer send the optimum igniting time instructions to the igniting of the 1st cylinder.

Technological scheme

Its technological scheme that adopts is: the principle according to electromagnetic induction realizes.

CKP is made up of inductor coil, induction rapier, permanent magnet, conjunction cable, gang socket and shell etc.When the triggering gear made from permeability magnetic material rotated, when the near CKP of certain toe joint, the magnetic field around this sensor progressively strengthened, and can induce the voltage of certain direction on the coil in sensor; When this tooth left CKP, weakened gradually in the magnetic field around the sensor, can induce voltage in the other direction on the coil.Owing to trigger gear the 36-2 tooth is arranged, trigger wheel from a crown to next crown and will change 10 °, therefore whenever circle and on the equally distributed gear teeth, can produce 34 voltages, frequency equates and the equal cycle of direction changes induced signal is given ECU; When Rotate 180 °, produce 18 signals; When turning over 90 °, produce 9 signals.ECU can accurately discern special angle of bent axle and engine speed according to the number of signals of CKP.Trigger wheel hypodontia part (lacking 2 teeth) and be located at the piston compression stroke top dead center, when the inswept CKP in hypodontia place, the signal (top dead center signal or ignition timing signal) that voltage of meeting generation is different with frequency also flows to ECU, and it is ignition advance angle that ECU comes calculating and sending to go out the optimum igniting time instructions with this signal.

The beneficial effects of the utility model are:

1, need not operating voltage;

2, highly sensitive: working speed 30～7000r/min, working clearance 1.8 ± 0.1mm;

3, adaptability is strong: can mate multiple motor;

4, reliability height;

5, operating temperature is wide :-40～120 ℃;

6, simple in structure, be easy to produce;

7, with low cost, the cost performance height;

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is a tectonic maps of the present utility model

Fig. 2 is a fundamental diagram of the present utility model.

Fig. 3 is another fundamental diagram of the present utility model.

1. conducting magnet cores among Fig. 1,2. inductor coil, 3. shell, 4. magnet steel, 5. shielding conjunction cable, 6. gang socket, 7.OUT1,8.OUT2,9.OUT3.

Embodiment

In Fig. 1, conducting magnet core (1) adopts electromagnetic pure iron, as the induction rapier; Be wound with the electromagnetic wire of certain number of turn on the inductor coil (2), can produce voltage signal at two ends during work; Magnet steel (3) adopts resistant to elevated temperatures samarium cobalt permanent magnet, and stable magnetic field can be provided; Shielding conjunction cable (5) links to each other with two output terminals of inductor coil (2) and OUT1 (7), OUT2 (8), the OUT3 (9) of gang socket respectively.

In embodiment illustrated in fig. 2, sensor (4) is installed in signal triggering wheel (5) and locates, and the working clearance is 1.8 ± 0.1mm.The OUT1 of its gang socket (1), OUT2 (2), OUT3 (3) link to each other with electronic controller (ECU) (6) respectively.When signal triggering wheel (5) during, will produce voltage signal at the OUT2 (2) and OUT3 (3) two ends of sensor (4), and amplitude and frequency can increase with the increase of engine speed with engine rotation.When the equally distributed gear teeth turned over sensor (4), OUT2 (2) can produce the voltage magnitude voltage signal identical with frequency with OUT3 (3) two ends, B among signal waveform such as the figure, and 2 teeth differ 10 ° of mechanical angles; When the hypodontia place turns over sensor (4), can produce a voltage magnitude and the visibly different voltage signal of frequency, A among signal waveform such as the figure at OUT2 (2) and OUT3 (3) two ends.This voltage signal is input to ECU (6) just as the top dead center signal, and ECU sends best ignition location signal (PIP) control ignition control module (ICM) according to these signals again the 1st cylinder spark coil is lighted a fire.

In another embodiment shown in Figure 3, the output waveform of sensor is the oscillogram that signal triggering wheel rotates 1 circle, as A in the CKP waveform among the figure to B.The signal that ECU produces according to the hypodontia place, as among the figure 1, calculate as the top dead center signal, at 10 ° of piston compression stroke budc (in 2) as figure, send ignition location signal (PIP) as figure (PIP waveform), ignition control module (ICM) is cut off the primary current of the 1st cylinder spark coil at once (as figure I ₁Waveform), the 1st cylinder spark coil output high pressure is lighted a fire (as figure U to cylinder ₁Waveform).

Claims

1. sensor that need not operating voltage, in insulation crust, conducting magnet core, inductor 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 inductor coil, and two output terminals of inductor coil are connected with the shielding conjunction cable.

2. sensor according to claim 1 is characterized in that: the magnetoelectricity conversion equipment is made up of conducting magnet core, inductor coil, magnet steel.