KR100534710B1 - Throttle position sensor - Google Patents

Abstract

A throttle position sensor is disclosed. The disclosed throttle position sensor includes a housing, a potentiometer installed inside the housing, a collector ring installed on the potentiometer so as to be connected to the throttle valve, and a cover covering the housing to protect the potentiometer. The potentiometer is divided into two zones with respect to the collector ring, and is characterized in that the variable resistors are provided on each side in a symmetrical manner.

According to the present invention, the stability of the TPS signal can prevent RPM instability and engine stop (start-up), thereby reducing customer complaints due to RPM instability and engine stop, and improving the stability.

Description

Throttle Position Sensors {THROTTLE POSITION SENSOR}

The present invention relates to a throttle position sensor, and more particularly, to a throttle position sensor for removing noise by using a double resistance difference.

A throttle position sensor (hereinafter referred to as a TPS) is a variable resistor installed in a carburetor, an injection mixer, and a throttle body, and detects a change in the throttle valve opening degree during acceleration as a change in resistance value in conjunction with a throttle axis. By this signal, the computer instructs fuel correction during acceleration.

There are two types of TPS, a contact type and a variable resistance type. Most of the old type used contact type, but nowadays almost all use variable resistance type.

As described above, the TPS is installed in the throttle body to detect the throttle valve opening amount, and inform the ECU of idle state, acceleration state, deceleration state and full load state to determine fuel injection amount, correct ignition timing and load state. According to the air conditioner compressor is also intermittent function.

In the case of automatic transmission (AT), the shift pattern is different according to the TPS value. Therefore, vehicles with an incorrect shift timing can be adjusted to the TPS value. That is, if the TPS value is lower than the prescribed speed, the shift is made faster, and if the TPS value is higher, the shift is made late. 0.5 T is the prescribed value of this TPS value.

FIG. 1 shows the internal configuration of the TPS as described above, FIG. 2 shows some details of FIG. 1, and FIG. 3 shows a schematic circuit diagram of the FIG. 1 TPS.

Referring to each of the drawings, the TPS includes a housing 10, a potentiometer 20, which is a ceramic substrate coated with a resistor installed inside the housing 10, and a throttle valve. A collector ring 11 installed at one side and provided to transfer power to and from an external circuit by a brush, and covering the housing 10 to protect the potentiometer 20. It includes a cover (not shown).

The potentiometer 20 includes first and second tracks Track1 and Track2 as resistors, and variable resistors R1, R2, R3, and R4 provided with the first and second tracks Track1 and Track2. Pin terminals (1pin, 2pin, 3pin) connected to the variable resistor are provided.

Referring to the operation principle and output characteristics configured as described above are as follows.

The brush provided at the end of the collector ring 11 connected to the throttle valve moves on the potentiometer 20 in conjunction with the movement of the throttle valve to obtain an output voltage proportional to the opening degree of the throttle valve.

The output voltage Up may be represented by Equation 1 below with reference to FIG. 3.

[Equation 1]

Up = (R1 '+ R2) × Uv / (R1 + R2 + R3)

Where Uv; Input voltage, R1 ': Variable resistance value of resistor R1.

And the output value of TPS is Up / Uv.

Meanwhile, in FIG. 4, an output characteristic curve for each rotation angle is shown.

As described above, the TPS according to the related art is a method of measuring the position of the throttle lever by measuring a resistance value that changes as the brush moves over the potentiometer 20 in the contact resistance measuring method.

Therefore, noise may be generated by vibrations or other influences, which may cause the TPS to emit an abnormal signal, which may lead to RPM instability and, in severe cases, engine stall. have.

The present invention was created in order to solve the above problems, a throttle position sensor which prevents RPM instability and engine stoppage (start-up) by stably outputting the TPS signal by removing noise by using a double resistance difference. The purpose is to provide.

The throttle position sensor of the present invention for achieving the above object, the cover, a potentiometer installed inside the housing, a collector ring installed on the potentiometer to be connected to the throttle valve, and a cover covering the housing to protect the potentiometer In the throttle position sensor provided with, the potentiometer is divided into two zones around the collector ring, characterized in that the variable resistance in each zone is provided symmetrically to the left and right, respectively.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 5 is a schematic view showing the configuration of a throttle position sensor according to the present invention. FIG. 6A and FIG. 6B show some detailed views of FIG. 5, and FIG. 7 shows a circuit diagram of FIG. 5 TPS. It is shown schematically.

Referring to the drawings, the throttle position sensor according to the present invention includes a housing 30, a potentiometer 40 installed in the housing 30, a collector ring 31 installed in the potentiometer so as to be connected to the throttle valve, A cover (not shown) covering the housing 30 to protect the potentiometer 40 is configured.

The potentiometer 40 constitutes a feature of the present invention, and is divided into two zones A-ZONE and B-ZONE around the collector ring 31 so that each zone A-ZONE, B Two variable resistors R1, R2, R3, R4, R'1, R'2, R'3, R'4 are provided on the left and right sides of the zone.

That is, the potentiometer 40, as shown in Figure 5, is divided into two zones (A-ZONE, B-ZONE) around the collector ring 31, the first and second tracks (Track 1, Track 2) And two variable resistors R1, R2, R3, R4, R'1, R'2, R'3, and R'4 provided together with the first and second tracks Track1 and Track2. .

The resistance values of the two variable resistors R1, R2, R3, R4, R'1, R'2, R'3, and R'4 increase and decrease opposite to each other, and the output voltage difference is output opposite to each other.

Referring to the operation of the throttle position sensor according to the present invention having the configuration as described above are as follows.

Referring back to the drawings, the throttle position sensor according to the present invention is one variable by using two variable resistors R1, R2, R3, R4, R'1, R'2, R'3, R'4. The resistances R1, R2, R3, and R4 decrease as the rotation angle increases (the output voltage decreases), and the other variable resistors R'1, R'2, R'3, and R'4 rotate. As the angle increases, the resistance increases (output voltage increases) so that the difference between the voltages measured by the two variable resistors R1, R2, R3, R4, R'1, R'2, R'3, R'4 Is used as the TPS signal.

This will be described in more detail.

Since the variable resistors R1, R2, R3, R4, R'1, R'2, R'3, R'4 are provided with the collector ring 31 symmetrically, the resistance value of one zone A-ZONE The resistances of and zones B-ZONE increase and decrease oppositely. Therefore, as shown in FIG. 7, V2 decreases when V1 increases, and V2 increases when V1 decreases.

The output voltage difference of the A-ZONE and the B-ZONE due to the change in resistance is opposite to each other, as shown in the graphs shown in FIGS. 8A to 8C, and the difference in voltages is the rotation angle as shown in the graph of FIG. 8C. Star characteristic curve can be obtained.

The principle is as follows.

TPS noise is introduced by external or other influences, although there is a limit to this, although a large portion of the noise is removed by a noise removal filter.

In the present invention, the noise generation as described above simultaneously affects the two variable resistors R1, R2, R3, R4, R'1, R'2, R'3, R'4 (V1, V2 output). Is designed under the assumption that the noise can be canceled out when the two outputs are subtracted because the noise increases or decreases or affects both outputs simultaneously.

Therefore, VI = normal output 1 + noise, V2 = normal output 2 + noise, and by using these formulas and the principle described above, the output voltage Vout can be represented by the following equation.

[Equation 2]

Vout = V1-V2 = (normal output 1 + noise)-(normal output 2 + noise)

               = Normal output 1-Normal output 2

As described above, the throttle position sensor according to the present invention has the following effects.

The stability of the TPS signal prevents RPM instability and engine shutdown (start-up). Therefore, it is possible to reduce customer dissatisfaction due to RPM instability and engine stop, and to improve stability.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent embodiments are possible. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

1 is an internal configuration diagram of a TPS according to the prior art.

2 is a partial detail of FIG. 1;

3 is a schematic circuit diagram of the FIG. 1 TPS;

Figure 4 is a graph showing the output characteristic curve for each rotation angle of the TPS.

5 is a configuration diagram schematically showing a configuration of a throttle position sensor according to the present invention.

6A and 6B show some detail of FIG. 5;

7 is a schematic circuit diagram of the FIG. 5 TPS;

8A to 8C are graphs illustrating characteristic curves of output voltage and rotation angle of FIG. 5 TPS, respectively.

<Description of the symbols for the main parts of the drawings>

30. Housing

31. Collector ring

40. Potentiometer

Claims (2)

A throttle position sensor comprising a housing, a potentiometer installed inside the housing, a collector ring installed on the potentiometer so as to be connected to the throttle valve, and a cover covering the housing to protect the potentiometer, The potentiometer is, Throttle position sensor, characterized in that divided into two zones around the collector ring is provided with a variable resistance symmetrically in each zone. The method of claim 1, The resistance values of the two variable resistors increase and decrease in opposition to each other, and the output voltage difference is output to the opposite sides.