CN105509773B - position sensor and system and position sensor and system for clutch master cylinder - Google Patents

Abstract

A clutch piston position sensor and system for sensing and generating clutch piston position signals at the top of the cylinder, moving position signals and bottom position signals of the cylinder, including: a detection circuit for sensing the clutch piston at the top position of the cylinder, moving position and the bottom position of the cylinder; a self-inspection circuit for self-inspection of the cylinder top position signal, motion position signal and cylinder bottom position signal sensed by the detection circuit; a diagnostic circuit for fault diagnosis of the detection circuit. The invention uses a detection circuit to sense the motion of the piston and obtain a position signal, and then compares the signal with a self-test circuit for self-test to judge whether there is an error in the top position signal, position motion signal and bottom position signal of the clutch piston; The detection circuit alone senses the position of the clutch piston at the bottom of the cylinder, and compares it with the position of the piston at the bottom of the cylinder detected by the detection circuit to determine whether an error occurs, thereby achieving the purpose of self-diagnosis.

Description

Position sensor and system and position sensor and system for clutch master cylinder

technical field

The present invention relates to position sensing devices, and more particularly to devices for generating monitoring signals based on sensed clutch positions.

Background technique

In the current automobile control technology, it is necessary to sense the clutch position of the automobile engine and generate a clutch position signal. Currently, the clutch position signal can be generated by a sensor system installed on the clutch master cylinder (Clutch Master Cylinder or CMC). For example, as the clutch pedal is stepped on, the existing sensing system installed on the clutch master cylinder can generate at least two signals, namely: a clutch top position signal and a clutch bottom position signal. The clutch top position signal indicates that the clutch is about to be stepped on or has just been stepped on (that is, the clutch friction plate is about to or has just been gradually disengaged; at this time, the gearbox and the engine are still in engagement), and the engine control unit (ECU) is ready to start the car's engine. The clutch bottom position signal indicates that the clutch is stepped on to the bottom position (the clutch friction plate is in the disengaged position; at this time, the gearbox and the engine are already in a disengaged state), and the engine control unit can start the car's engine or realize gear shifting. In addition, the existing sensing system can also generate a clutch motion signal, which indicates the state and position of the clutch between the bottom and top and back and forth.

However, the current clutch piston device can only provide three signals: the clutch top position signal, the clutch position movement signal and the clutch bottom position signal, but it cannot accurately self-test the signal and self-diagnose the detection circuit, and cannot meet the high requirements. Control requirements for performance cars.

Contents of the invention

One of the purposes of the present invention is to propose a clutch piston position sensor and system with self-checking and self-diagnosing capabilities, so as to meet the higher requirements and needs of automobile control systems.

In order to achieve the above object, the present invention provides a sensor with self-test and self-diagnosis function to generate clutch position signal, specifically:

A clutch piston position sensor, used for sensing and generating clutch piston position signals at the top of the cylinder, moving position signals and cylinder bottom position signals, including:

The detection circuit is used to sense the signal generated by the clutch piston during movement, and the signal includes signals corresponding to the position of the clutch piston at the cylinder top position, the moving position and the cylinder bottom position;

A self-inspection circuit, used for self-inspection of the signal sensed by the detection circuit, for judging whether the clutch piston cylinder top position signal, movement position signal and cylinder bottom position signal are in error;

A diagnostic module, configured to perform fault diagnosis on the detection circuit;

The diagnostic module senses the position of the clutch piston at the bottom of the cylinder and outputs a diagnostic signal of the bottom position of the cylinder; and

The diagnostic module compares the cylinder bottom position diagnostic signal with the cylinder bottom position signal to determine whether an error occurs, and outputs a diagnostic signal indicating whether the state of the clutch piston position sensor is abnormal or not.

In order to achieve the above purpose, the present invention provides a sensing system for generating clutch position signals with self-test and self-diagnosis functions, specifically:

A clutch piston position sensing system, used to generate clutch piston position signals at the top of the cylinder, moving position signals and cylinder bottom position signals, including:

Clutch piston cylinder; including the clutch piston cylinder and the clutch piston rod, the clutch piston rod can move back and forth in the clutch piston cylinder;

a magnet device, the magnet device is installed on the clutch piston rod, and moves back and forth with the clutch piston rod; and:

Like the aforementioned clutch piston position sensor, the clutch piston position sensor moves back and forth relative to the magnet device.

The invention also discloses an object motion sensing sensor. Specifically:

A position sensor, used to sense and generate the initial position signal, intermediate position signal and final position signal of the measured object, including:

The detection element is used to sense the signal generated by the object to be measured while moving, and the signal includes the signal of the initial position, the intermediate position and the final position;

A self-test circuit, used for self-testing the signal sensed by the detection element;

The diagnostic circuit is used for fault diagnosis of the detection circuit.

The invention also discloses a position sensing system, specifically:

A position sensing system, used to sense and generate the initial position signal, intermediate position signal and final position signal of the measured object, including:

a position sensor as described above; and

The magnet device is installed on the object to be measured, and moves back and forth with the object to be measured relative to the position sensor.

The invention uses a detection circuit to sense the motion of the piston and obtain a position signal, and then compares the signal with a self-test circuit for self-test to judge whether there is an error in the top position signal, position motion signal and bottom position signal of the clutch piston; The circuit senses the position of the clutch piston at the bottom of the cylinder, compares it with the position of the piston at the bottom of the cylinder detected by the detection circuit, judges whether an error occurs, and outputs a diagnostic signal indicating whether the state of the position sensor is abnormal or not, so as to achieve the purpose of self-diagnosis.

Description of drawings

Fig. 1 is the partial cross-sectional schematic diagram of main piston device of clutch;

Fig. 2 represents the schematic block diagram of the sensing device circuit of the present invention;

Fig. 3 shows a block diagram of an embodiment of the specific structure of the first processing device;

Fig. 4 shows a block diagram of an embodiment of the specific structure of the second processing device;

Fig. 5 shows the linear voltage output generated by processing the cosine-shaped voltage output and the sine-shaped voltage output sensed by the first Hall sensing unit by the processor in the first processing device.

Detailed ways

Various embodiments of the invention will be described below with reference to the accompanying drawings, which form a part hereof. It should be understood that although directional terms such as "front", "rear", "upper", "lower", "left", "right", etc. are used herein to describe various exemplary structural parts of the invention and elements, but these terms are used herein for explanatory purposes only, based on the example orientations shown in the figures. Since the disclosed embodiments of the present invention may be arranged in different orientations, these directional terms are for illustration only and should not be viewed as limiting. Where possible, the same or similar reference numerals used in the present invention refer to the same components.

FIG. 1 is a partial cross-sectional schematic diagram of the main clutch piston device 106 , showing the internal structure of the piston cylinder 108 and the schematic matching relationship between the clutch piston rod 109 and the piston cylinder 108 . As shown in FIG. 1 , the clutch master piston arrangement 106 includes a piston cylinder 108 . There is a cavity 161 in the piston cylinder 108, and the piston rod 109 extends into the piston cylinder cavity 161, and can move linearly back and forth in the piston cylinder cavity 161. For example, the proximal end 109a of the piston rod 109 is driven by a clutch pedal (not shown), and as the clutch pedal is stepped on and released, the piston rod 109 makes a linear reciprocating motion. The distal end 109b of the piston rod 109 is provided with a magnet device 166 (as an embodiment the magnet 166 can be a ring magnet such as around the piston rod 109), and this magnet device 166 is suitable for moving in a straight line with the piston rod 109 in the piston cylinder. body 108 for reciprocating motion. In the embodiment shown in FIG. 1 , the magnet device 166 reciprocates with the piston rod 109 between the cylinder top position (S2 position) and the cylinder bottom position (S3 position). Although not shown in the figure, the magnet device 166 can also be installed at other positions in the axial direction of the piston rod 109 . Since the proximal end 109a of the piston rod 109 is driven by the clutch pedal, the corresponding position of the magnet arrangement 166 in the piston cylinder 104 reflects the operating position of the clutch pedal and thus the corresponding operating position of the clutch.

In FIG. 1, the magnet device 166 mounted on the piston rod 109 moves in the cavity 161 of the piston cylinder 108, and the total movable distance is L1+L2. Wherein, the moving distance L1 between S1 and S2 represents the free moving distance of the clutch, that is, the moving of the clutch has not exerted separation force on the clutch friction plates. When the magnet device 166 has arrived at S2, the clutch is stepped on to just break away from the free state, that is, the clutch friction plate has just been applied a separation force, and at this moment the magnet device 166 is in the cylinder top position (S2 position). The stroke L2 from S2 to S3 represents that the separation force is gradually applied to the clutch friction plates until the clutch friction plates are completely separated, and at this moment the magnet device 166 is at the cylinder bottom position (S3 position).

The clutch master piston device 106 is provided with a sensing device 200 on the outer wall of the piston cylinder 108 . The sensing device 200 can be fixed on the piston cylinder 108 in various ways. For example, the sensing device 200 is mounted on the outer wall of the piston cylinder 108 through the mounting bracket 110 . In the embodiment shown in FIG. 1 , the position of the sensing device 200 in the axial direction of the piston cylinder 108 corresponds to the position of the magnet device 166 reciprocating between the cylinder top position (S2 position) and the cylinder bottom position (S3 position). area. When the magnet device 166 is in any position between the cylinder bottom position and the cylinder top position, the detection circuit in the sensing device 200 senses the magnetic field (or magnetic flux) generated by the magnet device 166 .

During operation, when the magnet device 166 moves along with the piston rod 109 between the top position S2 and the bottom position S3 of the piston cylinder 108, the magnetic field (or magnetic flux) generated by the magnet device 166 at the sensing device 200 will correspondingly Variety. The detecting circuit in the sensing device 200 disposed on the outer wall of the piston master cylinder 108 senses the change of the magnetic field (or magnetic flux) of the magnet device 166 and picks up corresponding data at a specific time to generate a signal for indicating the clutch position. In a preferred embodiment of the present invention, the signals indicating the clutch position generated by the sensing device 200 include: a clutch top position signal CTS (generated when the magnet device 166 moves to S2 in the piston cylinder 108), a clutch bottom position signal CBS (generated when the magnet device 166 moves to S3 in the piston cylinder 108 ) and motion signal EPB (generated when the magnet device 166 is between the position S2 and the position S3 of the piston cylinder 108 ). The clutch top position signal CTS indicates that the clutch is in the state of being stepped on and disengaged from the free state, and the magnet device 166 has arrived at the top position of the cylinder block where the separation force has just been applied to the clutch friction plates. is engaged. The clutch bottom position signal CBS indicates that the magnet device 166 has reached the cylinder bottom position (that is, the clutch friction plates are in the disengaged position, and the gearbox and the engine are completely separated). The motion signal EPB indicates that the magnet device 166 is between the position S2 and the position S3, and the clutch friction plate is in a transition state from engagement to disengagement.

FIG. 2 shows a structural block diagram of a sensing device 200 of the present invention. In the embodiment shown in FIG. 2 , the sensing device 200 includes a first detection circuit (main detection circuit), a second detection circuit (auxiliary detection circuit) and a third detection circuit. According to a preferred embodiment of the present invention, the detection circuit in the sensing device 200 includes a plurality of Hall sensing units. In the example shown in FIG. 2 , the first Hall sensing unit 301 , the second Hall sensing unit 302 and the third Hall sensing unit 303 respectively correspond to the first detection circuit and the second detection circuit in the sensing device 200 and the third detection circuit to form a corresponding detection circuit. The plurality of Hall sensing units are arranged and operated independently of each other. For example, the first Hall sensing unit 301, the second Hall sensing unit 302 and the third Hall sensing unit 303 operate independently, respectively sensing the magnetic flux density and/or magnetic field generated by the magnet device 166 at different positions, and then generating and Output a corresponding analog voltage signal conforming to the function line, for example, a sine-shaped or cosine-shaped analog voltage signal.

Each Hall sensing unit 301 , 302 , 303 can sense the magnetic flux density and/or the magnetic field generated by the magnet device 166 at different positions in one or more dimensions (eg, X, Y, Z dimensions). For example, the first Hall sensing unit 301 is a 2D Hall sensing unit capable of sensing magnetic flux density and/or magnetic field in two dimensions (such as X and Y dimensions). In the example shown in FIG. 2 , the sensing device 200 includes a first 2D Hall sensing unit 301 , a second 2D Hall sensing unit 302 and a third 2D Hall sensing unit 303 . Each of the first 2D Hall sensing unit 301 and the second 2D Hall sensing unit 302 synchronously (or simultaneously) senses a change in magnetic flux density and/or a change in a magnetic field in a two-dimensional direction (eg, Bx and By dimensions), and generates The analog voltage signal output conforming to two function lines (for example, one output curve is a cosine-shaped analog voltage signal output, and the other output curve is a sine-shaped analog voltage signal output). The first 2D Hall sensing unit 301 , the second 2D Hall sensing unit 302 and the third 2D Hall sensing unit 303 can sense the magnetic field (or magnetic flux) generated by the magnet device 166 at different positions in the piston cylinder 108 .

In addition, the plurality of Hall sensing units 301 , 302 , 303 in the sensing device 200 can sense magnetic flux density and/or magnetic field in at least one same dimensional direction (eg, X or Y dimension). In one example, the first Hall sensing unit 301 and the second Hall sensing unit 302 can sense a magnetic flux density and/or a magnetic field in at least one same dimensional direction (eg, X or Y dimension). In another example, the third Hall sensing unit 303 and the second Hall sensing unit 302 can sense the magnetic flux density and/or the magnetic field in the same dimensional direction (eg, X or Y dimension).

The sensing device 200 also includes a first processing device (DSP) 305 . In FIG. 2 , outputs of the first 2D Hall sensing unit 301 and the second 2D Hall sensing unit 302 are connected to a first processing device (DSP) 305 . As the magnet device 166 periodically moves back and forth in the cavity 161 of the piston cylinder, the first processing device (DSP) 305 generates a clutch bottom position signal in the form of a jump signal when the magnet device 166 reaches the cylinder bottom and cylinder top positions CBS and the clutch top position signal CTS, and the acquisition of the periodically changing signal during the movement of the magnet device 166 produces the movement signal EPB.

FIG. 3 shows a block diagram of an embodiment of the specific structure of the first processing device 305 . As shown in FIG. 3 , the first processing device 305 includes a comparator 387 , an analog-to-digital (A/D) conversion circuit 362 , a processor 364 and a V/P conversion (ie voltage/PMW conversion) circuit 366 . The circuit structure in FIG. 3 shows the process of the first processing device 305 performing self-check on the signal. For example, in a preferred embodiment of the present invention, each of the first 2D Hall sensing unit 301 and the second 2D Hall sensing unit 302 senses synchronously (or simultaneously) in the same two-dimensional direction (for example, Bx and By dimensions). The analog voltage signal (motion signal EPB) output conforming to two function lines produced by measuring the change of magnetic flux density and/or magnetic field (for example, one output curve is a cosine-shaped analog voltage signal output, and the other output curve is a sine-shaped analog voltage signal output). The first 2D Hall sensing unit 301 and the second 2D Hall sensing unit 302 respectively transmit the cosine-shaped analog voltage signal output and the sinusoidal-shaped analog voltage signal output to the first processing device 305 .

The comparator 388 and the analog-to-digital (A/D) conversion circuit 362 in the first processing device 305 receive two cosine-shaped analogs generated respectively from the first 2D Hall sensing unit 301 and the second 2D Hall sensing unit 302 at the same time. Voltage signal output (or two sine-shaped analog voltage signal outputs); the comparator 388 regularly (for example, at intervals of 0.8ms) samples the two cosine-shaped analog voltage signal outputs (or sine-shaped analog voltage signal outputs), and then Compares two sampled values.

If the two sampled voltage values are equal or the difference is within the allowable value (for example, the difference between the two signal peak values exceeds 5%), it means that the self-test of the sensing signal is normal. When the self-test result shows normal, the comparator 388 sends the self-test result to . The processor 364 sends a command to the analog-to-digital (A/D) conversion circuit 362 to select one of the two sets of outputs of the first 2D Hall sensing unit 301 and the second 2D Hall sensing unit 302, and connect 370 and 371 to The selected cosine-shaped digital voltage signal output and sine-shaped analog voltage signal output are sent to the processor 364 . Processor 364 supplies the control signal and linear voltage output to V/P conversion circuit 366 via connections 367 and 368, respectively. Under the control of the processor 364 , the V/P conversion circuit 366 converts the linear voltage output from the processor 364 into a pulse width modulation (Pulse Width Modulation or PMW) signal. Specifically: the processor 364 processes the cosine digital voltage signal and the sine digital voltage signal sent from the analog-to-digital (A/D) conversion circuit 362, so as to output a linear voltage signal output (ie, the motion signal EPB). Through the connection 368, the processor 364 transmits the linear voltage output to the V/P conversion circuit 366; through the connection 367, the processor 364 controls the V/P conversion circuit 366 to convert the linear voltage output into a duty cycle variation range of 10%. ~90% PWM signal; then output through the output terminal 345 , and simultaneously output the clutch bottom position signal CBS and the clutch top position signal CTS in the form of switching signals. The V/P conversion circuit 366 transmits the PWM signal (motion signal EPB) with a duty ratio varying from 10% to 90% to the ECU respectively. When the ECU receives the PWM output signal when the duty ratio ranges from 10% to 90% and the clutch bottom position signal CBS and clutch top position signal CTS in the form of switch signals, it knows that the self-test status is normal.

If the two sampled voltage values (including the clutch bottom position signal CBS, the clutch top position signal CTS, and the motion signal EPB) are not equal and the difference exceeds the allowable value (for example, the difference between the two signal peaks exceeds 5%), it means Sensing signal self-test is abnormal, through connection 367, processor 364 controls the voltage/PMW (V/P) conversion circuit to generate a constant 5% duty cycle PWM signal; then, through three output terminals 353, 354, 355 , the V/P conversion circuit 366 transmits the constant 5% duty cycle PWM signal to the ECU. When the ECU receives the output signal of the PWM with a constant 5% duty cycle, it knows that the self-check state is abnormal; if necessary, the ECU (or processor 364) sends a text report message to the intermittent abnormal state or an audible warning signal.

It should be noted that when the V/P conversion circuit 366 outputs a PWM signal with a constant 5% duty cycle, it means that the working state of the first 2D Hall sensing unit 301 and/or the second 2D Hall sensing unit 302 is intermittent. It is a permanent abnormal state, rather than indicating that the first 2D Hall sensing unit 301 and the second 2D Hall sensing unit 302 are in permanent failure. This intermittent abnormal state may be caused by some temporary or transient working conditions (such as sudden bumps when the vehicle is driving, vibrations that cause instantaneous changes in the position of sensing elements or magnets, or temporary internal temperature of the vehicle during driving. abnormal increase). That is to say, although the currently measured cylinder top position signal (CTS), motion position signal (EPB) and cylinder bottom position signal (CBS) are not suitable for use; once the working conditions return to normal, the cylinder top position signal ( CTS), motion position signal (EPB) and cylinder bottom position signal (CBS) can still be used normally. One of the advantages of this error reporting method is that a separate error reporting signal channel is omitted for outputting error reporting signals, and the error reporting method is compatible with existing ECU performance. Moreover, comparing the two cosine-shaped analog voltage signal outputs (or two sine-shaped analog voltage signal outputs) generated at the first 2D Hall sensing unit 301 and the second 2D Hall sensing unit 302, the accuracy is high and the lines are relatively Simple.

As mentioned above, with the position of the magnet device 166 moving back and forth in the cavity 161 of the piston cylinder, the first 2D Hall sensing unit 301 and the second 2D Hall sensing unit 302 each move in a two-dimensional direction (for example, Bx and By dimensions) to sense changes in magnetic flux density and/or magnetic field to produce voltage outputs that conform to two function lines (one output curve is a cosine-shaped voltage output, and the other output curve is a sine-shaped voltage output). The first 2D Hall sensing unit 301 (or the second 2D Hall sensing unit 302 ) transmits its cosine-shaped voltage output and sinusoidal voltage output to an analog-to-digital (A/D) conversion circuit 362 in the first processing device 305 . The analog-to-digital (A/D) conversion circuit 362 converts the cosine analog voltage signal and the sinusoidal analog voltage signal sensed from the first 2D Hall sensing unit 301 (or the second 2D Hall sensing unit 302) into digital signals, and then The cosine digital voltage signal and the sine digital voltage signal are delivered to processor 364 . The processor 364 converts the cosine digital voltage signal and the sine digital voltage signal sent from the analog-to-digital (A/D) conversion circuit 362 into a linear voltage output, and the calculation method is shown in the following formula:

(1) Output voltage (V) = function of angle = m x (angle) + b = m x θ + b

(2) Output voltage (V) = stroke function = m x (stroke) + b = m x S + b

(3) tan(θ)=sin(θ)/cos(θ)=B _x /B _y

(4) θ=arctan(θ)=arc(sin(θ)/cos(θ))=arc(B _x /B _y )

(5) Output voltage (V) = mx arc((sin(θ)/cos(θ))+b=mx arc(B _x /B _y )+b

(6) Conversion of unit stroke and angle = (L x 2)/360°.

In the above 6 calculation formulas, the effective stroke Lx2 of the magnet device 166 in the piston cylinder cavity 161, (that is (the distance between S3-S2) x2) corresponds to a circular cycle; that is: the entry stroke (from S2 to S3 ) may correspond to the upper half of the circular cycle, while the exit stroke (from S3 to S2) may correspond to the lower half of the circular cycle. m and b (b can be 0) are two constant parameters, where m represents the slope of the linear function. The parameters b and m can be obtained through simulation according to the devices actually used for the first Hall sensing unit 301 and the second Hall sensing unit 302 . θ is the rotation angle after converting the linear stroke of the magnet device 166 into a circular period, B _x and _By are the magnetic flux in the X direction and the Y direction respectively, and L is the stroke of the magnet device 166 in the piston-cylinder cavity 161.

Referring now to FIG. 2, the three output terminals 343, 344 and 345 of the first processing device 305 respectively input the cylinder top position signal (CTS), the motion position signal (EPB) and the cylinder bottom position signal (CBS) to three current Amplifying circuits (three field effect transistors) 353, 354 and 355 amplify the drive current of the output cylinder top position signal (CTS), motion position signal (EPB) and cylinder bottom position signal (CBS). The sensing device 200 also includes a current protection circuit 311 whose three input terminals are connected to the outputs of the three current amplification circuits 353 , 354 and 355 . The current protection circuit 311 is a circuit for performing EMC protection on the first processing device 305 and the second processing device 306, and outputs the clutch bottom position signal CBS to the power amplifier 386, and then outputs it after power amplification. The function of the power amplifier 386 is to enable the cylinder bottom switch signal to drive a high power load such as a transmission chain relay. Through the current protection circuit 311 , the clutch top position signal CTS, the motion signal EPB and the clutch bottom position signal CBS are output to three output terminals 472 , 373 and 374 .

The diagnosis module in the sensing device 200 will be described below with reference to FIG. 2 and FIG. 4 . The diagnosis module includes: a diagnosis detection circuit, a second processing device 306 , and a diagnosis circuit 310 . The diagnostic detection circuit is used to sense the clutch piston bottom position. In an example according to the present invention, the third Hall sensing unit 303 is a part of the diagnostic detection circuit.

Still referring to FIG. 2, the third Hall sensing unit 303 can sense the cylinder bottom position of the magnet device 166 in the piston cylinder 108 synchronously with the first 2D Hall sensing unit 301 and the second 2D Hall sensing unit 302, for Diagnostic signal (CBS+) as cylinder bottom position signal (CBS). The input terminal 346 of the second processing device 306 is connected to the output of the third Hall sensing unit 303, and the diagnostic signal (CBS+) of the cylinder bottom position signal (CBS) is delivered to the current amplifying circuit (FET) through its output terminal 347 ) 356 to amplify the driving current. The cylinder bottom position signal (CBS) output from the current amplifying circuit 355 is connected to a steady current circuit (regulator) 357; Regulator 358 . Regulators 357 and 358 enable the sensor to be applied in the environment of 5V, 12V, 24V or 42V and other customer-end vehicle power systems, improving the universality of the product. These two steady current circuits are used to adapt the circuit of the diagnostic processing chip to make the diagnostic module work normally. In addition, the processing chips used in the present invention are all calibratable, and the terminal 377 (teaching) is a chip programming interface for programming the chip.

The cylinder bottom position signal (CBS) output from the steady current circuit 357 and the diagnosis signal (CBS+) of the cylinder bottom position signal (CBS) output by the steady current circuit 358 are delivered to the diagnostic circuit (exclusive OR circuit) 310 respectively, and the cylinder bottom The position signal (CBS) is compared with the cylinder bottom position diagnosis signal (CBS+). When the signal CBS is the same as the diagnostic signal CBS+, the diagnostic circuit (exclusive OR circuit) 310 outputs a system diagnostic (diagnosis) correct signal (can be a high-level signal or a low-level signal); when the signal CBS is different from the diagnostic signal CBS+, The diagnosis circuit (exclusive OR circuit) 310 outputs a system diagnosis error signal (can be a low-level signal or a high-level signal). Through the output terminal 376, the diagnostic circuit 310 sends the CBS diagnostic signal to the ECU; if necessary, the ECU (or the processor 364) sends a text report message or an audio warning signal for intermittent abnormal states.

FIG. 4 shows a block diagram of an embodiment of the specific structure of the second processing device 306 . As shown in FIG. 4 , the second processing device 306 includes an analog-to-digital (A/D) conversion circuit 472 and a processor 474 . The analog-to-digital (A/D) conversion circuit 472 and the processor 474 in the second processing device 306 can be similar to the analog-to-digital (A/D) conversion circuit 362 and the processor 364 in the first processing device 305, so no more details are given. . Along with the position of the magnet device 166 moving back and forth in the cavity 161 of the piston cylinder, the third Hall sensing unit 303 senses the magnetic flux density change and /or the voltage output that conforms to the function line generated by the change of the magnetic field. For example, the third Hall sensing unit 303 is a 2D Hall sensing unit, which can sense changes in magnetic flux density and/or magnetic fields in two-dimensional directions, and generate voltage outputs that conform to two function lines (one output curve is cosine-shaped voltage output, the other output curve is sinusoidal voltage output). The third Hall sensing unit 303 transmits its sinusoidal voltage output and sinusoidal voltage output to the second processing device 306 . In order to facilitate the further processing of the sensing signal, the third processing device 306 outputs the cosine-shaped voltage output and the sine-shaped voltage output from the third Hall sensing unit 303 according to the mathematical formulas (1)-(6) listed above. converted into a linear voltage output.

Fig. 5 shows that the processor 364 outputs the cosine-shaped analog voltage signal and the sinusoidal analog voltage generated by the first 2D Hall sensing unit 301 (or the second 2D Hall sensing unit 302) according to the six formulas listed above The signal output is processed to produce a linear voltage output 500 . In FIG. 5 , the abscissa represents the stroke position of the magnet device 166 in the piston-cylinder cavity 161 , and the vertical coordinate represents the corresponding voltage output corresponding to the stroke position of the magnet device 166 . As shown in Figure 5, corresponding to the stroke position of the magnet device 166 in the piston cylinder cavity 161 S2, the output voltage of the processor 364 is V _CTS ; corresponding to the stroke position of the magnet device 166 in the piston cylinder cavity 161 S3, The output voltage of the processor 364 is V _CBS ; corresponding to the stroke position of the magnet device 166 between S2 and S3 in the piston cylinder cavity 161, the output voltage of the processor 364 is V _EPB , (that is, between the voltage V _CTS and the voltage All voltages between V _CBS represent the voltage V _EPB ).

Although the present invention will be described with reference to specific embodiments shown in the drawings, it should be understood that the clutch piston position sensor and system of the present invention may have many variations without departing from the spirit and scope and context of the teachings of the present invention. Those of ordinary skill in the art will also recognize that there are different ways to vary parameters of the disclosed embodiments of the invention, such as size, shape, or type of elements or materials, all falling within the spirit and spirit of the invention and claims. within range.

Claims (15)

1. a kind of clutch plunger position sensor, for sensing and generating clutch plunger in cylinder top position signal, motion bit Confidence number and cylinder bottom position signal, it is characterised in that including：

Detection circuit, the signal generated on the move for sensing clutch plunger, the signal include corresponding clutch plunger In cylinder top position, the signal of movement position and cylinder bottom position；

Self-checking circuit, the signal for being sensed to the detection circuit carry out self-test, to judge clutch plunger cylinder top position Whether confidence number, movement position signal and cylinder bottom position signal there is mistake；

Diagnostic module, for carrying out fault diagnosis to the detection circuit；

The diagnostic module sensing clutch plunger in cylinder bottom position and exports cylinder bottom position diagnostic signal；And

Cylinder bottom position diagnostic signal is compared the diagnostic module with the cylinder bottom position signal, judges whether to occur Mistake, and diagnostic signal whether export the clutch plunger position sensor abnormal state.

2. clutch plunger position sensor as described in claim 1, it is characterised in that：

The detection circuit includes：Main detection circuit and auxiliary detection circuit；

The main detection circuit is used for synchronous sensing clutch plunger generated signal on the move with the auxiliary detection circuit.

3. clutch plunger position sensor as claimed in claim 2, it is characterised in that further include：

First processing unit connect with the output of the main detection circuit and the auxiliary detection circuit, main detection circuit is felt The signal measured is compared with the signal that the auxiliary detection circuit is sensed；

If the signal value matching or poor that signal and the auxiliary detection circuit that the main detection circuit is sensed are sensed When value is in permissible value, then first processing unit exports the signal of the first form；

If signal value that signal and the auxiliary detection circuit that the main detection circuit is sensed are sensed mismatch or When difference exceeds permissible value, then first processing unit exports the signal of the second form.

4. clutch plunger position sensor as claimed in claim 3, it is characterised in that：

The signal of first form includes the cylinder top position signal and cylinder bottom position signal of switching signal form；And duty Than the movement position signal for the pwm signal form that variation range is 10%-90%；

The signal of the second form, including duty ratio be 5% pwm signal form cylinder top position signal, cylinder bottom position letter Number and movement position signal.

5. such as claim 1, the clutch plunger position sensor described in 2,3 or 4, it is characterised in that the diagnostic module packet It includes：

Diagnosis and detection circuit in cylinder bottom position and exports sensing signal for synchronous sensing clutch plunger；

Second processing device is connect with the output of the diagnosis and detection circuit, will be from the sensing of the diagnosis and detection circuit output Signal processing is at cylinder bottom position diagnostic signal；

Diagnostic circuit, for the cylinder bottom position signal to be compared with cylinder bottom position diagnostic signal.

6. clutch plunger position sensor as claimed in claim 5, it is characterised in that：

If being matched from the cylinder bottom position signal with cylinder bottom position diagnostic signal, the diagnostic circuit output position sensing The diagnostic signal of device normal condition,

If the cylinder bottom position signal is mismatched with cylinder bottom position diagnostic signal, the diagnostic circuit output position sensing The diagnostic signal of device abnormality.

7. a kind of clutch plunger position sensing system, for generating clutch plunger in cylinder top position signal, motion bit confidence Number and cylinder bottom position signal, it is characterised in that including：

Clutch plunger cylinder, including clutch plunger cylinder body and clutch plunger bar, clutch plunger bar can be in clutch plungers It is moved back and forth in cylinder body；

Magnet arrangement, the magnet arrangement are installed on clutch plunger bar, and are done with the round-trip of clutch plunger bar It moves back and forth；And

Such as clutch plunger position sensor according to any one of claims 1 to 6, the magnet arrangement is relative to institute Clutch plunger position sensor is stated to move back and forth.

8. clutch plunger position sensing system as claimed in claim 7, it is characterised in that：

The clutch plunger position sensor is fixedly mounted on the clutch plunger cylinder.

9. a kind of position sensor, for sensing and generating testee in initial position signal, centre position signal and final Position signal, it is characterised in that including：

Detecting element, the signal generated on the move for sensing testee, the signal include initial position, centre position With the signal of final position；

Self-checking circuit, the signal for being sensed to the detecting element carries out self-test, to judge initial position signal, centre Whether position signal and final position signal there is mistake；

Diagnostic module, for carrying out fault diagnosis to the detecting element, sensing testee in final position signal and exports Final position diagnostic signal, and be compared with the final position signal, judge whether that mistake occurs, exports the position and pass Diagnostic signal whether sensor abnormal state.

10. position sensor as claimed in claim 9, it is characterised in that：

The detection circuit includes：Main detection circuit and auxiliary detection circuit；

The main detection circuit is used for synchronous sensing testee generated signal on the move with the auxiliary detection circuit.

11. position sensor as claimed in claim 10, it is characterised in that：

First processing unit connect with the output of the main detection circuit and auxiliary detection circuit, and main detection circuit is sensed To signal be compared with the signal that auxiliary detection circuit is sensed；

If the signal value matching or poor that signal and the auxiliary detection circuit that the main detection circuit is sensed are sensed When value is in permissible value, then first processing unit exports the signal of the first form；

If signal value that signal and the auxiliary detection circuit that the main detection circuit is sensed are sensed mismatch or When difference exceeds permissible value, then first processing unit exports the signal of the second form.

12. position sensor as claimed in claim 11, it is characterised in that：

The signal of first form includes the cylinder top position signal and cylinder bottom position signal of switching signal form；And duty Than the movement position signal for the pwm signal form that variation range is 10%-90%；

The signal of the second form, including duty ratio be 5% pwm signal form cylinder top position signal, cylinder bottom position letter Number and movement position signal.

13. the position sensor as described in any one of claim 9 to 12, which is characterized in that further include：

Diagnosis and detection circuit for the synchronous final position for sensing testee and exports sensing signal；

Second processing device is connect with the output of diagnosis and detection circuit, will be handled from the sensing signal of diagnosis and detection circuit output At final position diagnostic signal；

Diagnostic circuit, for the final position signal to be compared with the final position diagnostic signal.

14. position sensor as claimed in claim 13, it is characterised in that：

If being matched from the final position signal with the final position diagnostic signal, the diagnostic circuit output position sensing The diagnostic signal of device normal condition,

If the final position signal is mismatched with the final position diagnostic signal, the diagnostic circuit output position sensing The diagnostic signal of device abnormality.

15. a kind of position sensing system, for sensing and generating testee in initial position signal, centre position signal and most Whole position signal, it is characterised in that including：

Position sensor as described in any one of claim 9 to 14；And

Magnet arrangement, the magnet arrangement are installed on testee, and are carried out with the relatively described position sensor of testee It moves back and forth.