KR101062715B1 - Vehicle speed output device - Google Patents

Abstract

The present invention relates to a vehicle speed calculating device.

An apparatus for calculating a vehicle speed of a vehicle, the apparatus comprising: a partial pressure and a single pole filter circuit for removing noise included in a pulse type vehicle speed signal and dividing a voltage value of the vehicle speed signal; And a first time point at which the divided voltage and the first filter circuit unit receive a filtering signal that is a vehicle speed signal from which the noise is removed, and converts the filtering signal into digital data, and converts the minimum or maximum value of the filtering signal into a minimum or maximum value of the digital data. A time from a second time point at which the next minimum value or the next maximum value of the filtering signal is converted to the next minimum value or the next maximum value of the digital data is set as a period of the vehicle speed signal, and the vehicle speed is calculated using the period. Provided is a vehicle speed calculating device comprising a micro controller unit (MCU).

According to the present invention, since the MCU can receive the pulse type vehicle speed signal, convert it into digital data, set the period of the vehicle speed signal, and calculate the vehicle speed using the period, the production cost of the ECU is reduced.

Vehicle speed, ECU, MCU, ADC

Description

Apparatus for Caculating Vehicle Speed

The present invention relates to a vehicle speed calculating device. More specifically, a device for calculating the period and vehicle speed of the vehicle speed signal received from the vehicle speed sensor using an analog to digital convertor (ADC) module of a micro controller unit (IC) without using an integrated circuit (IC) or an inversion circuit. It is about.

In general, the vehicle speed acts as an important variable controlling the driving condition of the vehicle.In an automatic transmission vehicle, the engine performance and the driving situation depend on the load applied to the engine, that is, the opening degree of the throttle valve and the shift pattern set by the vehicle speed. To set the most appropriate speed.

The ECU (Electronic Control Unit) of the system which uses the vehicle speed as a control factor such as the electric power steering (EPS) of the vehicle receives the pulse type vehicle speed signal from the vehicle speed sensor and calculates the frequency of the vehicle speed signal. The vehicle speed was calculated using the calculated frequency.

Conventionally, the ECU configures a reverse voltage prevention and pull up circuit unit 110 and a single-pole filter circuit unit 120 as shown in FIG. 1A or 1B to remove noise included in a vehicle speed signal. In addition, the vehicle speed signal may be transmitted by the microcontroller unit (MCU) in the inverted circuit 150 including any one of an inverter (Inverter) and a comparator (IC) 130 or a transistor and a field effect transistor (FET). After processing so as to be recognized by the 140, input to the timer module 142 of the MCU 140, the vehicle speed was calculated using the frequency and the frequency of the vehicle speed signal in the MCU (140).

As such, there is a problem in that the production cost of the ECU is increased because an expensive IC or an inversion circuit is used to process the vehicle speed signal so that the MCU can recognize the vehicle speed signal.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide an apparatus for calculating a period and a vehicle speed of a vehicle speed signal received from a vehicle speed sensor using an ADC module of an MCU without using an IC or an inversion circuit. .

In order to achieve the above object, the present invention is to calculate the vehicle speed of the vehicle, including a reverse voltage prevention and pull-up circuit unit, the noise removal included in the pulse speed vehicle speed signal and divided the voltage value of the vehicle speed signal A partial pressure and a single pole filter circuit portion to be divided; And a first time point at which the divided voltage and the first filter circuit unit receive a filtering signal that is a vehicle speed signal from which the noise is removed, and converts the filtering signal into digital data, and converts the minimum or maximum value of the filtering signal into a minimum or maximum value of the digital data. A time from a second time point at which the next minimum value or the next maximum value of the filtering signal is converted to the next minimum value or the next maximum value of the digital data is set as a period of the vehicle speed signal, and the vehicle speed is calculated using the period. Provided is a vehicle speed calculating device comprising a micro controller unit (MCU).

In addition, according to another object of the present invention, in the apparatus for calculating the vehicle speed in the ECU (Electronic Control Unit), receiving the filtering signal from which the noise included in the vehicle speed signal from the divided voltage and the primary filter circuit unit included in the ECU An analog to digital converter (ADC) module for converting digital data; And a first time point at which the ADC module converts the minimum or maximum value of the filtering signal into a minimum or maximum value of the digital data, and a next minimum value or next maximum value of the filtering signal, the next minimum value or next maximum value of the digital data. And a vehicle speed calculation module for checking a second time point converted to the second time point, setting a time from the first time point to the second time point as a period of the vehicle speed signal, and calculating the vehicle speed using the period. It provides a vehicle speed calculating apparatus.

As described above, according to the present invention, the MCU can receive the pulse type vehicle speed signal, convert it into digital data, set the period of the vehicle speed signal, and calculate the vehicle speed using the period. It's losing.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

2 is a block diagram schematically illustrating an internal configuration of an ECU for calculating a vehicle speed according to an exemplary embodiment of the present invention.

The ECU 200 of the vehicle speed calculating device according to the embodiment of the present invention, that is, the system using the vehicle speed as a control factor, includes a reverse voltage prevention and pull-up circuit unit 110, a partial voltage and a single pole filter circuit unit 210, and MCU 220 is included. Here, since the reverse voltage prevention and pull-up circuit unit 110 is included in the conventional ECU 100, a detailed description thereof will be omitted.

The divided voltage and the primary filter circuit unit 210 remove noise included in the pulse type vehicle speed signal, as well as the vehicle speed signal, like the single-pole filter circuit unit 120 included in the conventional ECU 100. The voltage value is divided by the allowable input voltage value of the MCU 220. For example, when the voltage value of the vehicle speed signal is 10V (volts) and the allowable input voltage value is 5V, the divided voltage and the primary filter circuit 210 may remove noise included in the vehicle speed signal, as well as the voltage value of the vehicle speed signal. Drop from 10V to 5V. Here, the partial pressure and primary filter circuit unit 210 includes a resistor (R) -C (Capacitor) filter, and the partial pressure uses the partial pressure and the resistor included in the primary filter 210.

The MCU 220 controls the overall functions of the ECU 200.

In the present invention, the MCU 220 receives the filtering signal from which the noise included in the vehicle speed signal from the divided voltage and the primary filter circuit unit 210 is converted into digital data, and as shown in FIGS. 3 and 4, the minimum value of the filtering signal (or From the first time point at which the maximum value) is converted to the minimum value (or maximum value) of the digital data until the second time point at which the next minimum value (or next maximum value) of the filtering signal is converted to the next minimum value (or next maximum value) of the digital data. Is set to the period T of the vehicle speed signal. Here, the next minimum value (or next maximum value) is the minimum value (or maximum value) immediately after the minimum value (or maximum value) of the filtering signal or digital data.

In the present invention, when the pulse width of the vehicle speed signal is narrow as shown in FIG. 3, that is, when the vehicle speed is fast, the period T of the vehicle speed signal is decreased, and when the pulse width of the vehicle speed signal is wide as shown in FIG. 4, that is, the vehicle speed is slow. In this case, since the period T of the vehicle speed signal becomes large, the frequency f of the vehicle speed signal inversely proportional to the period T of the vehicle speed signal becomes large when the pulse width of the vehicle speed signal is narrow, and the pulse width of the vehicle speed signal is increased. In this wide case, the value becomes small.

The MCU 320 calculates the vehicle speed by using the period of the vehicle speed signal. Here, the method for calculating the vehicle speed by using the period of the vehicle speed signal is a known technique, and thus a detailed description thereof will be omitted.

The reason why the MCU 220 receives the filtering signal which is the vehicle speed signal from which the noise is removed in the present invention is that when the vehicle speed signal including the noise is converted into digital data, an error of the digital data may occur due to the noise.

5 is a block diagram schematically showing the internal configuration of the MCU according to an embodiment of the present invention.

MCU 220 according to an embodiment of the present invention includes an analog to digital converter (ADC) module 510 and the vehicle speed calculation module 520.

The ADC module 510 is a module that converts analog signals into digital data.

In the present invention, the ADC module 510 receives the divided signal included in the ECU 200 and the filtering signal from which the noise included in the vehicle speed signal is removed from the primary filter circuit unit 210 and converts the digital signal into digital data.

The vehicle speed calculating module 520 may determine a first time point in which the ADC module 510 converts the minimum value (or maximum value) of the filtering signal into the minimum value (or maximum value) of the digital data, and the next minimum value (or next maximum value) of the filtering signal. The second time point converted to the next minimum value (or next maximum value) of the digital data is confirmed, and the time from the first time point to the second time point is set as the period T of the vehicle speed signal.

The vehicle speed calculating module 520 calculates the vehicle speed by using the period T of the vehicle speed signal.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

As described above, the present invention is applied to the field of the vehicle speed calculating apparatus, and the MCU can receive the pulse type vehicle speed signal and convert it into digital data to set the period of the vehicle speed signal, and calculate the vehicle speed using the period. Therefore, it is a very useful invention that produces the effect of lowering the production cost of the ECU.

1 is a block diagram schematically showing the internal configuration of a conventional ECU;

2 is a block diagram schematically illustrating an internal configuration of an ECU for calculating a vehicle speed according to an embodiment of the present invention;

3 and 4 are views for explaining a vehicle speed calculation method according to an embodiment of the present invention,

5 is a block diagram schematically showing the internal configuration of the MCU according to an embodiment of the present invention;

<Description of Symbols for Main Parts of Drawings>

110: reverse voltage prevention and pull-up circuit portion 120: primary filter circuit portion

130: IC 140: MCU

142: timer module 150: inversion circuit

200: ECU 210: partial pressure and primary filter circuit

220: MCU 510: ADC module

520: vehicle speed calculating unit

Claims (4)

A device for calculating a vehicle speed of a vehicle and including reverse voltage prevention and pull-up circuitry, A partial pressure and a single pole filter circuit unit for removing noise included in a pulse type vehicle speed signal and dividing a voltage value of the vehicle speed signal; And From the first time point, the partial pressure and the first filter circuit unit receives the filtering signal, the vehicle speed signal from which the noise is removed, and converts it into digital data, and converts the minimum or maximum value of the filtering signal into the minimum or maximum value of the digital data. MCU to set the time until the second time point at which the next minimum value or next maximum value of the filtering signal is converted to the next minimum value or next maximum value of the digital data as the period of the vehicle speed signal, and calculate the vehicle speed using the period. (Micro Controller Unit) Vehicle speed calculating apparatus comprising a. The method of claim 1,  And the partial pressure and primary filter circuit unit includes a resistor (R) -C (capacitor) filter. The method of claim 1, And the voltage divider and the primary filter circuit divide the voltage value of the vehicle speed signal into an allowable input voltage value of the MCU. In the device for calculating the vehicle speed in the ECU (Electronic Control Unit), An analog-to-digital converter (ADC) module for receiving the filtering signal from which the noise included in the vehicle speed signal is removed from the divided voltage and the primary filter circuit unit included in the ECU and converting the digital signal into digital data; And A first time point in which the ADC module converts the minimum or maximum value of the filtering signal into a minimum or maximum value of the digital data and a next minimum value or next maximum value of the filtering signal to a next minimum value or next maximum value of the digital data. A vehicle speed calculating module that checks the converted second time point, sets a time from the first time point to the second time point as the period of the vehicle speed signal, and calculates the vehicle speed using the period Vehicle speed calculating apparatus comprising a.

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