KR20070060390A - Obtaining device of driving speed for hybrid vehicle and safety design method using thereof - Google Patents

Abstract

A traveling speed calculating device of a hybrid vehicle and a safety design method using the same are provided to exactly calculate the traveling speed of the vehicle although errors are generated in all vehicle speed signals except one signal, by using plural vehicle speed signals input through several paths. A traveling speed calculating device(100) of a hybrid vehicle is composed of a conversion unit(110) converting a vehicle speed into a predetermined signal, wherein the vehicle speed includes a first vehicle speed calculated by using RPM(Revolution Per Minute) information of a motor input through a CAN(Controller Area Network), a second vehicle speed computed by using RPM information of the motor input through PWM(Pulse Width Modulation), and a third vehicle speed computed by using a state equation of a planetary gear of the motor; an input unit(120) to which the first, second, and third vehicle speed signals converted in the conversion unit are input; a control unit(130) comparing and judging the first, second, and third vehicle speed signals input through the input unit and selecting one of the vehicle speed signals as the traveling speed of the vehicle, according to a pre-set logic; and an output unit(140) outputting the vehicle traveling speed chosen by the control unit to the outside.

Description

OBTAINING DEVICE OF DRIVING SPEED FOR HYBRID VEHICLE AND SAFETY DESIGN METHOD USING

1 is a block diagram showing a speed calculating device for a hybrid running vehicle according to the present invention;

2 is a circuit diagram implemented based on FIG. 1.

Figure 3 is a flow chart illustrating a safety design method using a traveling speed calculation apparatus for a hybrid vehicle according to the present invention.

* Description of the symbols for the main parts of the drawings *

100: traveling speed calculating device of the hybrid vehicle

110: conversion unit 120: input unit

130 control unit 140 output unit

The present invention relates to a traveling speed calculating device of a hybrid vehicle and a safety design method using the same, and specifically, a plurality of inputs through various paths to prevent a malfunction of various control devices used as a control factor of the vehicle. The present invention relates to a traveling speed calculating device of a hybrid vehicle and a safety design method using the same, comparing and determining a vehicle speed signal.

In general, the instrument panel of the vehicle is equipped with a speedometer so that the driver can recognize the driving speed of the vehicle being driven, by using this to recognize the driving speed of the vehicle to promote safe driving.

The driving speed of the vehicle measured by the speedometer is applied as driving control factors such as low speed quietness control, maximum speed limit control and cooling, and air conditioning system control of the vehicle. I don't have a relationship.

Therefore, in a general vehicle, when a failure and a failure occur in a signaled vehicle speed (hereinafter, referred to as a vehicle speed signal) input through the speedometer, a failure and a failure diagnosis are performed by relatively simple logic determination. The malfunction prevention processing limits the vehicle speed signal to a certain value.

However, in the case of a hybrid vehicle, the vehicle speed signal plays an important role for vehicle stability and driving performance compared to a general vehicle, so it is important to pay close attention to the multiplexing of signals and prevention of malfunction of various control devices, such as setting an alternative signal of the vehicle speed signal. Is required.

Accordingly, the present invention is to solve the above-mentioned problems, and to compare and determine a plurality of vehicle speed signals input through various paths so as to prevent a malfunction of various control devices in which the vehicle's driving speed is used as a control factor, the accurate vehicle An object of the present invention is to provide a driving speed calculating device for a hybrid vehicle and a safety design method using the same.

The apparatus for calculating a traveling speed of a hybrid vehicle according to the present invention for achieving the above object includes a first vehicle speed calculated by using rotational speed information of a motor through a controller area network (CAN) and a pulse width (PWM). A conversion unit for converting the second vehicle speed calculated using the rotational speed information of the motor through Modulation and the third vehicle speed calculated using the planetary gear state equation of the motor into a predetermined signal; An input unit to which the first to third vehicle speed signals converted by the converter are input; A controller which compares and determines the first to third vehicle speed signals input through the input unit and selects one of the vehicle speeds according to a preset logic; And an output unit configured to output the traveling speed of the vehicle selected by the controller to the outside.

In addition, the driving speed calculation method of the hybrid vehicle according to the present invention, the first and second vehicle speeds are calculated using the rotational speed information of the motor through CAN and PWM, and the planetary gear state equation of the motor is used to calculate the third speed. Calculating a vehicle speed and measuring a fourth vehicle speed from a sensor attached to the wheel; A second step of converting the first to third vehicle speeds calculated and measured through the first step into first to third vehicle speed signals, respectively, and inputting the converted first to third vehicle speed signals and the fourth vehicle speed; Wow; Comparing and determining the first to third vehicle speed signals input in the second step, selecting one of the vehicle speed and the fourth vehicle speed of the first to third vehicle speed signals according to a preset logic as the driving speed of the vehicle. A third step; And a fourth step of transmitting the traveling speed of the vehicle selected in the third step to various control devices.

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

1 is a block diagram illustrating an apparatus for calculating a traveling speed of a hybrid vehicle according to the present invention, and FIG. 2 is a circuit diagram implemented based on FIG. 1.

1 and 2, the traveling speed calculating apparatus 100 of the hybrid vehicle according to the present invention is largely composed of a converter 110, an input unit 120, a controller 130 and an output unit 140. do.

The converter 110 signals the vehicle speed calculated and measured through a plurality of paths, and transmits the vehicle speed signal converted by the converter 110 to the input unit. The vehicle speed signal converted by the converter 110 includes a first vehicle speed signal, a second vehicle speed signal, a third vehicle speed signal, and a fourth vehicle speed signal.

In particular, the first vehicle speed signal is based on rotational speed information of a motor input through a controller area network (CAN). That is, substituting the rotational speed of the motor input through the CAN into a predetermined conversion equation yields a first vehicle speed, and the first vehicle speed calculated by the conversion equation passes through the conversion unit 110. Converted to vehicle speed signal.

The second vehicle speed signal is based on rotational speed information of a motor input through pulse width modulation (PWM). Substituting the rotational speed of the motor input through the PWM into a predetermined conversion equation (a conversion equation different from the conversion equation for calculating the first vehicle speed), the second vehicle speed is calculated, and the second calculated by the conversion equation. The second vehicle speed is converted into a second vehicle speed signal via the conversion unit 110.

The third vehicle speed signal is based on the rotational speed of the motor using the planetary gear state equation of the motor. That is, when the planetary gear state equation is used, a third vehicle speed is calculated, and the calculated third vehicle speed is converted into a third vehicle speed signal through the conversion unit 110.

At this time, the state equation of the planetary gear for calculating the third vehicle speed is as follows.

Ns = ((1 + R) ㅧ Nc)-(R ㅧ Nr)

Where Ns and Nc are the rotational speeds of the sun gear and the carrier, respectively, and Nr is the rotational speed of the ring gear, that is, the rotational speed of the motor (vehicle speed), and R is the gear ratio of the gear. to be.

The fourth vehicle speed is measured by a sensor attached to a wheel of an anti-lock brake system (ABS), and is directly input to the input unit 120 without a separate conversion process.

The input unit 120 receives the first to third vehicle speed signals converted by the converter 110 and a fourth vehicle speed not passed through the converter 110.

The controller 130 compares and determines the first to third vehicle speed signals input through the input unit 120 to determine the first to third vehicle speeds according to the first to third vehicle speed signals according to a preset logic. One of the fourth vehicle speeds is selected as the traveling speed of the vehicle. In addition, the output unit 140 transmits the traveling speed of the vehicle selected by the control unit to various control devices.

Looking at the traveling speed calculation method of the traveling speed calculation apparatus 100 of the present invention hybrid vehicle having the configuration as described above are as follows.

3 is a flowchart illustrating a safety design method using a traveling speed calculating apparatus of a hybrid vehicle according to the present invention.

As shown in FIG. 3, the safety design method using the driving speed calculating apparatus of the hybrid vehicle according to the present invention has a total of four steps.

The first step (S100) calculates the first and second vehicle speeds using the rotational speed information of the motor through CAN and PWM, calculates the third vehicle speed using the planetary gear equation of the motor, The fourth vehicle speed is measured from the attached sensor.

The second step S200 converts the first to third vehicle speeds calculated and measured through the first step S100 into first to third vehicle speed signals, respectively, and converts the converted first to third vehicle speed signals and Enter the fourth vehicle speed.

The third step S300 compares and determines the first to third vehicle speed signals input in the second step S200, and determines among the vehicle speed and the fourth vehicle speed of the first to third vehicle speed signals according to preset logic. Select one as the vehicle's driving speed.

The fourth step S400 transmits the traveling speed of the vehicle selected in the third step to various control devices.

Table 1 shows selection signals applied when the vehicle speed signal inputted to the traveling speed calculating device of the hybrid vehicle is abnormal. Referring to Table 1, the driving speed calculation logic applied to the third step S300 will be described as follows. .

First, when the first to third vehicle speed signals are the same (S310), the vehicle speed of the first vehicle speed signal is selected as the driving speed of the vehicle (S315); When the first and second vehicle speed signals are the same and the third vehicle speed signals are different (S320), selecting the vehicle speed of the first vehicle speed signal as the driving speed of the vehicle (S325); When the second and third vehicle speed signals are the same and the first vehicle speed signals are different (S330), the vehicle speed of the third vehicle speed signal is selected as the driving speed of the vehicle (S335).

In addition, when the first and third vehicle speed signals are the same and the second vehicle speed signals are different (S340), the vehicle speed of the first vehicle speed signal is selected as the driving speed of the vehicle (S345); When all of the first to third vehicle speed signals are different (S350), the fourth vehicle speed is selected as the driving speed of the vehicle (S355).

On the other hand, when an error occurs in the CAN command or a failure occurs in the sensor attached to the wheel of the ABS so that the first and third vehicle speed signals are not input (S360), the vehicle speed of the second vehicle speed signal is converted to the vehicle speed. Select (S365).

As described above, although the configuration and driving speed calculation method of the traveling speed calculating apparatus of the hybrid vehicle according to the preferred embodiment of the present invention are shown according to the above description and drawings, these are merely described as examples and the technical features of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit.

As described above, the apparatus for calculating the traveling speed of the hybrid vehicle of the present invention and the safety design method using the same have the advantage of calculating the accurate driving speed by comparing and determining a plurality of vehicle speed signals input through various paths.

In addition, since a plurality of vehicle speed signals inputted through various paths are used, even when an error occurs or an error occurs in all but one of the plurality of vehicle speed signals, the accurate driving speed of the vehicle can be calculated.

In addition, by using the calculated traveling speed of the vehicle, there is an advantage in that various control devices of the hybrid vehicle using the vehicle speed as a control factor can be prevented from malfunctioning.

Claims (15)

A first vehicle speed calculated using the rotation speed information of the motor through a controller area network (CAN), a second vehicle speed calculated using the rotation speed information of the motor through pulse width modulation (PWM), and A converting unit converting the third vehicle speed calculated by using the planetary gear equation to a predetermined signal; An input unit to which the first to third vehicle speed signals converted by the converter are input; A controller which compares and determines the first to third vehicle speed signals input through the input unit and selects one of the vehicle speeds according to a preset logic; An output unit configured to output a driving speed of the vehicle selected by the controller to the outside; Running speed calculating apparatus of a hybrid vehicle, characterized in that comprising a. The method according to claim 1, And a fourth vehicle speed is measured from a sensor attached to a wheel of an anti-lock brake system (ABS), and the fourth vehicle speed is directly input to the input unit. The method according to claim 1 or 2, And the control unit selects the vehicle speed of the first vehicle speed signal as the traveling speed of the vehicle when the first to third vehicle speed signals are the same. The method according to claim 1 or 2, The controller selects a vehicle speed of the first vehicle speed signal as a driving speed of the vehicle when the first and second vehicle speed signals are the same and the third vehicle speed signals are different. . The method according to claim 1 or 2, The controller selects a vehicle speed of the third vehicle speed signal as a driving speed of the vehicle when the second and third vehicle speed signals are the same and the first vehicle speed signals are different. . The method according to claim 1 or 2, The controller selects a vehicle speed of the first vehicle speed signal as a driving speed of the vehicle when the first and third vehicle speed signals are the same and the second vehicle speed signals are different. . The method according to claim 1 or 2, And the controller selects the fourth vehicle speed as the traveling speed of the vehicle when all of the first to third vehicle speed signals are different from each other. The method according to claim 1 or 2, When the controller generates an error in the CAN command or a failure occurs in a sensor attached to the wheel of the ABS, the controller selects the vehicle speed of the second vehicle speed signal as the traveling speed of the vehicle. Device. The first and second vehicle speeds are calculated using the rotational speed information of the motor through CAN and PWM, the third vehicle speed is calculated using the planetary gear equation of the motor, and the fourth vehicle from the sensor attached to the wheel. A first step of measuring speed; A second step of converting the first to third vehicle speeds calculated and measured through the first step into first to third vehicle speed signals, respectively, and inputting the converted first to third vehicle speed signals and the fourth vehicle speed; Wow; Comparing and determining the first to third vehicle speed signals input in the second step, selecting one of the vehicle speed and the fourth vehicle speed of the first to third vehicle speed signals according to a preset logic as the driving speed of the vehicle. A third step; A fourth step of transmitting the traveling speed of the vehicle selected in the third step to various control devices; Safety design method using a traveling speed calculating device of a hybrid vehicle, characterized in that consisting of. The method according to claim 9, And when the first to third vehicle speed signals are identical to each other, selecting the vehicle speed of the first vehicle speed signal as the traveling speed of the vehicle. The method according to claim 9, When the first and second vehicle speed signals are the same and the third vehicle speed signals are different, the vehicle speed of the first vehicle speed signal is selected as the traveling speed of the vehicle. Design method. The method according to claim 9, When the second and third vehicle speed signals are the same and the first vehicle speed signals are different, the vehicle speed of the third vehicle speed signal is selected as the traveling speed of the vehicle. Design method. The method according to claim 9, When the first and third vehicle speed signals are the same and the second vehicle speed signals are different, the vehicle speed of the first vehicle speed signal is selected as the traveling speed of the vehicle. Safety design method. The method according to claim 9, And when the first to third vehicle speed signals are different from each other, selecting the fourth vehicle speed as a traveling speed of the vehicle. The method according to claim 9, When an error occurs in the CAN command or a failure occurs in a sensor attached to an ABS wheel, the vehicle speed of the hybrid vehicle is selected as the vehicle speed of the second vehicle speed signal. Safety design method.

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