CN101117921B - Working method of air throttle position transducer of automobile engine control system - Google Patents

Abstract

The present invention discloses a theory and its work method of an anti-jamming and anti-redundancy sensor in the air damper position of the auto engine control system. The sensor comprises a carbon-film resistor, a brush, a brush rocker, etc. The carbon-film resistor is arranged on a circuit sheet; the brush rocker is arranged in the air damper installation position of the sensor; and the brush is arranged on the brush rocker. The present invention is characterized in that the carbon films and brushes are classified into two groups, and two items in different groups can output two different complementary carbon films of the voltage signal to connect ECU. Since the present invention adopts two groups of carbon films to output two different complementary voltage signals to ECU, ECU can modify signals which need modification according to the character of the two complementary voltage signals, thus the veracity of the engine control can be improved to realize better anti-jamming quality.At the same time, the invention also has anti-redundancy quality, namely when a group of carbon films or brushes are broken, ECU can also acquire effective signal to continue working by the characterof the complementary output signal of the two groups of carbon films.

Description

The throttle position sensor method of work of automobile engine control system

Technical field the present invention relates to a kind of throttle position sensor method of work that passes automobile engine control system.

Social production and the living needs of background technique in order to meet continuous development, Hyundai Motor uses increasing new technology to become a kind of inexorable trend.These The application of new technique have been brought many benefits to automobile, to different loads, highway section, environment, travel and the reaction of operating conditions perfect day by day, rapid; Improved the Economy of vehicle; Reduced discharging; Improved the travelling comfort of driving.But, these The application of new technique are when bringing day by day complete function to automobile, also whole automotive electrical system reliability is had higher requirement, adopt a large amount of electronic equipments not only to want to resist the interference that external environment may occur, as whether high-voltage power supply being arranged near thunder and lightning, the vehicle, whether using powerful wireless transmitting device.Also must consider the interference of automotive interior power supply, electromagnetic field, the interference that interference that igniting causes as power supply fluctuation, coil and a large amount of electric capacity in electronic equipment and the product and inductance bring, these external environments and the inner electromagnetic wave that produces all can exert an adverse impact to automobile electronic system, even damage electronic parts and components.

Therefore, in the design vehicle electronic component, just should consider especially that the anti-interference of device reduces the influence that system is brought because of electromagnetic interference as far as possible.Engine control system is being played the part of crucial role in whole auto parts machinery is formed, throttle position sensor is one of component relatively more crucial in the engine control system, in throttle position sensor in the past, the structure of this throttle position sensor is mainly by housing, cap, the brush rocking arm, brush, circuit board, composition such as tenminal block and terminal jacket, adopt single group of fixed carbon resister, brush, the design of single output signal, when circuit is interfered, during as power supply fluctuation, deviation can take place in the voltage signal of the throttle position sensor output that ECU reads, because throttle position sensor has only single signal output, when output signal generation deviation, measurement result is just inaccurate, will certainly influence the control of ECU to motor.Will feed through to like this that motor is lighted a fire normally, oil spout, the use of vehicle is caused adverse effect.Simultaneously, in case this group fixed carbon resister or brush damage, that throttle position sensor will more seriously influence the proper functioning of motor with regard to total failure.

Summary of the invention

Technical problem to be solved by this invention provides a kind of method of work of described automobile engine control system throttle position sensor.

Described method of work may further comprise the steps:

When (1) throttle position sensor was worked, the voltage signal of two complementations of two groups of carbon film outputs was imported ECU simultaneously;

(2) ECU judges according to the characteristics of two voltage signal complementations whether signal is interfered, and when not being interfered, the voltage of two complementations of two groups of carbon film outputs is U1 and U2, and U1+U2=U, and U is the magnitude of voltage at two groups of carbon film two ends; When being interfered, the voltage signal after the skew is U1 ', U2 ', judges that the formula whether signal is interfered is:

U-ΔU≤U ₁′+U ₂′≤U+ΔU；

Wherein Δ U is rational tolerance; When the signal of input ECU meets above-mentioned formula, think that signal is accurate, do not need to revise, ECU uses U1 ' output order; If U ₁'+U ₂'＜U-Δ U or U ₁'+U ₂During '＞U+ Δ U, think that sensor is subjected to larger interference, cause a deviation that should in time revise, reduction value V meets following formula:

$V=\frac{({U_1}^{\&prime;}+{{\mathrm{<figure-callout\; id="2"\; label="U"\; filenames="S06162001420060823E000041.png"\; state="\{\{state\}\}">U</figure-callout>}}_2}^{\&prime;})-(U_1+U_2)}{2};$

Measured value U after the deviation that the reduction interference causes ₁=U ₁'-V, that is:

$U_1={U_1}^{\&prime;}\frac{({U_1}^{\&prime;}+{{\mathrm{<figure-callout\; id="2"\; label="U"\; filenames="S06162001420060823E000041.png"\; state="\{\{state\}\}">U</figure-callout>}}_2}^{\&prime;})-(U_1+U_2)}{2}$

At this moment, ECU uses the U1 signal output order after reducing.

When one group of carbon film or brush damage, ECU also can obtain useful signal U1=U-U2 by complementary these characteristics of two groups of carbon film output signals, works on.

The present invention is owing to adopt two different, complementary voltage signals of two groups of carbon film outputs to ECU.Therefore ECU can revise the signal that is necessary to revise according to the characteristics of two voltage signal complementations, just can obtain certain raising to the accuracy of engine control, has realized better anti-interference.Simultaneously, the present invention also has redundancy, and when promptly one group of carbon film or brush damaged, ECU also can obtain useful signal by complementary these characteristics of two groups of carbon film output signals, works on.

Description of drawings

Fig. 1 is the outline drawing of sender unit cover direction;

Fig. 2 is the outline drawing of sensor and throttle plate pin connecting direction;

Fig. 3 is a sensor longitudinal axis center line sectional drawing (longitudinal axis center line such as Fig. 2);

Fig. 4 is the plan view of sensor brush rocking arm;

Fig. 5 is the plan view of sensor brush rocking arm;

Fig. 6 is the schematic representation of interior carbon film of sensor and brush;

Fig. 7 is a sensor carbon film circuit layout;

Fig. 8 is the brush rocking arm and the brush structural representation of sensor, adopts the double brush structure;

Fig. 9 is the Up/U-closure corner corresponding relation of two pairs of fixed carbon resisters among Fig. 6, and wherein Up is meant the output voltage values when brush touches the carbon film relevant position, and U is a supply voltage;

Figure 10 is before and after disturbing, the variation of two pairs of fixed carbon resister Up/U-closure corner corresponding relation curves;

Figure 11 is the flow chart of ECU to the makeover process of signal.

Among the figure: 1, tenminal block, 11, the pin on the circuit substrate, 12, the pin on the circuit substrate, 13, the pin on the circuit substrate, 14, the pin on the circuit substrate, 2, terminal jacket, 3, the brush rocking arm, 4, cap, 5, circuit board, 6, the throttle plate pin mounting hole, 7, brush rocking arm afterbody, 81, carbon film, 82, carbon film, 83, carbon film, 84, carbon film, 91, brush, 92, brush, 93, brush, 94, brush.

The invention will be further described below in conjunction with the drawings and specific embodiments for embodiment.

The form structure of this throttle position sensor, as shown in Figure 1, 2, profile is succinct, makes simple.Fig. 3 is its cross-section structure, marked out the chief component of this position transducer: this throttle position sensor is made up of housing, cap 4, brush rocking arm 3, brush, circuit board 5, tenminal block 1 and terminal jacket 2 etc., 4 11,12,13,14 altogether of tenminal blocks 1 link to each other with power supply, ground wire, ECU respectively as pin; Terminal jacket 2 main effects are the reliabilities when protecting terminal and assurance terminal with outside the connection, and have waterproof sealing; Brush rocking arm 3 links to each other with sensor throttle plate pin mounting hole 6.Its center brush rocking arm as shown in Figure 4 and Figure 5.The main effect of brush rocking arm is to cooperate throttle plate pin to coaxially rotate together, thereby the brush that drives afterbody slides on carbon film.

Electrospray throttle valve position transducer in the mode of execution is installed on the throttle body, as Fig. 4, Fig. 5, Fig. 6, Fig. 7, shown in Figure 8, comprise carbon film, brush, brush rocking arm, carbon film is installed on the circuit substrate, totally four, from top to bottom, two carbon films are one group successively, be that carbon film 81, carbon film 82 are first group, carbon film 83, carbon film 84 are second group.The two ends of middle two carbon films 82,83 connect respectively that magnitude of voltage equates, opposite polarity voltage, and two carbon films 81,84 are connected with ECU respectively up and down.Brush rocking arm 3 is installed on the throttle plate pin mounting hole 6, brush is installed on the brush rocking arm 3, brush is total up to four, four brushes are installed on the same brush rocking arm 3, from the throttle plate pin mounting hole of rocking arm 3 to rocking arm afterbody 7, two brushes are independent one group successively, and promptly brush 91, brush 92 are first group, and brush 93, brush 94 are second group.Two groups of carbon films all adopt concentric camber line design, this design, and the isocentric circular arc track in the time of can making carbon film cooperate two groups of brushes to rotate, effectively to the ECU output signal, and simple in structure, easy row.

The fixed carbon resister on the circuit substrate and the layout of circuit as shown in Figure 7,4 pinouts are respectively:

The signal output that pin 11---carbon film is first group

Pin 12---power supply input

The signal output that pin 13---carbon film is second group

Pin 14---ground connection

Closure door-plate one rotates, and rocking arm also is being with two groups of brushes to carry out coaxial rotation.If add suitable voltage at the carbon film two ends, when two groups of brushes slided on fixed carbon resister, also for ECU provides two voltage signals, these two signals had complementary characteristic before not being interfered.This specific character can help ECU to judge whether signal is interfered, if be interfered, just can be through revising, and in time reduce undesired signal, increase the accuracy of sensor.The basic functional principle of the electrospray throttle valve position transducer in Here it is the mode of execution.

Below in conjunction with accompanying drawing 9, accompanying drawing 10, accompanying drawing 11, further specify the working procedure of the electrospray throttle valve position transducer in the mode of execution.

Suppose that the input power supply is U, first group of carbon film output signal is U1, second group of carbon film output signal is U2, rotation along with the closure door-plate, the curve that U1, U2 change with the door-plate angle of swing as shown in Figure 9, these two curves are the complementary fully linearity curves of slope, that is to say, no matter the closure door-plate rotates to the unspecified angle that allows in the angular range, has all the time: U1+U2=U.

During the work of this throttle position sensor, two voltage signals of output are imported ECU simultaneously, and the effect of U2 signal is to help ECU to judge whether signal is interfered and calculates interference volume, thus correction U1 signal.And the U1 signal after being corrected is exactly the required signal of ECU correction motor oil spout igniting.In case throttle position sensor is interfered, deviation will appear in U1, U2 signal, as shown in figure 10, supposes that V is a departure, and the signal after the generation deviation is U1 ', U2 '.After this moment, ECU collected U1 ', U2 ', if do not revise, then the instruction of system's output had certain error, influences the working state of motor.As previously described, the utilization Fig. 7 circuit structure, can make the ECU picked up signal after, earlier judge whether signal is disturbed, the oil spout fired state that needs are changed is revised again, and the foundation of judging is exactly before not being interfered, two signals of U1, U2 complementary these characteristics, i.e. U1+U2=U.So in case U occurs ₁'+U ₂' ≠ U illustrates that then this sensor signal departs from, and should be revised.

The method of revising is that ECU calculates the departure V that sensor signal produces because of interference, and so Shi Ji signal value is exactly U ₁=U ₁'-V so just can reduce disturbance value.

But because the links such as production of actual carbon film exist certain error, so be necessary to determine a rational tolerance Δ U is used to judge whether sensor is interfered, and judgment formula is:

U-ΔU≤U ₁′+U ₂′≤U+ΔU

When the signal of input ECU meets above-mentioned formula, can think that signal is accurate, do not need to revise.ECU uses U1 ' output order.If U ₁'+U ₂'＜U-Δ U or U ₁'+U ₂During '＞U+ Δ U, can think that sensor is subjected to larger interference, cause a deviation, should in time revise.As previously described, reduction value is V, that is:

$V=\frac{({U_1}^{\&prime;}+{{\mathrm{<figure-callout\; id="2"\; label="U"\; filenames="S06162001420060823E000041.png"\; state="\{\{state\}\}">U</figure-callout>}}_2}^{\&prime;})-(U_1+U_2)}{2}$

So, measured value U after the deviation that the reduction interference causes ₁=U ₁'-V, that is:

$U_1={U_1}^{\&prime;}\frac{({U_1}^{\&prime;}+{{\mathrm{<figure-callout\; id="2"\; label="U"\; filenames="S06162001420060823E000041.png"\; state="\{\{state\}\}">U</figure-callout>}}_2}^{\&prime;})-(U_1+U_2)}{2}$

Also promptly:

$U_1={U_1}^{\&prime;}-\frac{({U_1}^{\&prime;}+{{\mathrm{<figure-callout\; id="2"\; label="U"\; filenames="S06162001420060823E000041.png"\; state="\{\{state\}\}">U</figure-callout>}}_2}^{\&prime;})-\mathrm{<figure-callout\; id="2"\; label="U"\; filenames="S06162001420060823E000041.png"\; state="\{\{state\}\}">U</figure-callout>}}{2}$

(wherein U is the supply voltage of sensor, just the magnitude of voltage at two groups of carbon film two ends.)

ECU uses the U1 signal output order after the reduction.

Brief description is the redundancy of the electrospray throttle valve position transducer in the mode of execution once, owing to adopted two groups of carbon film structures, and two groups of carbon films all are independent output signals.Therefore wherein one group of carbon film lost efficacy, and also had other one group can work on, and for ECU provides signal, guaranteed that motor normally moves.According to the power supply that remains when supplying with sensor is U, and before not being interfered, the output signal U 1 of two groups of carbon films, U2 are complementary, i.e. U1+U2=U.We suppose that the useful signal that ECU uses still is U1.If that group carbon film or the brush of output U1 signal damage, and one group of carbon film of output U2 signal and brush can also proper functioning words, ECU also can pass through these characteristics of U1+U2=U, obtains useful signal U1=U-U2 at an easy rate, thereby works on.

Claims (2)

1. the method for work of the throttle position sensor of automobile engine control system may further comprise the steps:

When (1) throttle position sensor was worked, the voltage signal of two complementations of two groups of carbon film outputs was imported ECU simultaneously;

(2) ECU judges according to the characteristics of two voltage signal complementations whether signal is interfered, and when not being interfered, the voltage of two complementations of two groups of carbon film outputs is U1 and U2, and U1+U2=U, and U is the magnitude of voltage at two groups of carbon film two ends; When being interfered, the voltage signal after the skew is U1 ', U2 ', judges that the formula whether signal is interfered is:

U-ΔU≤U ₁′+U ₂′≤U+ΔU；

Wherein Δ U is rational tolerance; When the signal of input ECU meets above-mentioned formula, think that signal is accurate, do not need to revise, ECU uses U1 ' output order; If U ₁'+U ₂'＜U-Δ U or U ₁'+U ₂During '＞U+ Δ U, think that sensor is subjected to larger interference, cause a deviation that should in time revise, reduction value V meets following formula:

$V=\frac{({U_1}^{\&prime;}+{U_2}^{\&prime;})-(U_1+U_2)}{2};$

Measured value U after the deviation that the reduction interference causes ₁=U ₁'-V, that is:

$U_1={U_1}^{\&prime;}-\frac{({U_1}^{\&prime;}+{U_2}^{\&prime;})-(U_1+U_2)}{2};$

At this moment, ECU uses the U1 signal output order after reducing.

2. method of work according to claim 1 is characterized in that: when one group of carbon film or brush damage, ECU also can obtain useful signal U1=U-U2 by complementary these characteristics of two groups of carbon film output signals, works on.

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