JP2008137489A - Analog/digital status conversion method and vehicle traveling controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily convert various analog voltages to a digital status without increasing burden of CPU. <P>SOLUTION: The vehicle control device is constituted so as to have a cruise switch part 101 for setting of the traveling state; and an electronic control unit 102 for controlling injection action of an injector 103 according to an output signal of the cruise switch part 101. In the electronic control unit 102, it is determined whether the analog voltage inputted from the cruise switch part 101 corresponds to any of a plurality of predetermined determination areas (S100-S110), and the digital status previously set to the determined area is set as the digital status relative to the inputted analog voltage (S112-S122). The traveling control of the vehicle is performed according to the digital status. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for converting an analog signal into a digital status corresponding to the magnitude of the signal, and more particularly to a method for simplifying the conversion process.

Conventionally, this type of analog / digital status conversion processing is performed, for example, as an automatic constant speed traveling device that is mounted on a vehicle and maintains the vehicle in a constant speed traveling state under a predetermined condition. And a control device for switching the gear of the vehicle (for example, see Patent Document 1, Patent Document 2, etc.)
For example, if an automatic constant speed traveling device is taken as an example, in such a device, an analog voltage signal generated according to the setting state of the switch is converted into a predetermined digital status (digital signal) representing a traveling state corresponding to the voltage. To convert, first, it is determined which of the plurality of preset voltage ranges (regions) the generated analog voltage signal belongs to. This is because the voltage according to the setting state of the switch is not always a constant value due to manufacturing errors of the electronic components that make up the circuit, and an error may occur. This is so that it can be converted. Then, according to such a determination result, the voltage value is once converted into a predetermined voltage value determined for each determined voltage range, and a digital value determined in advance with respect to the predetermined voltage value. A method is adopted in which the status is a digital status for the voltage value before conversion.

  For example, assume that the output voltage of a switch is VS, and that the output voltage when the switch is turned on is VS = Vα, and the voltage range to be determined is two voltage ranges, that is, greater than 0. In addition, it is assumed that a first range of V1 or less and a second range of greater than V1 and less than V2 are defined. If 0 <Vα <V1, the output voltage Vα is assumed to be the voltage V1 for conversion to a digital status. Thereafter, a predetermined digital status preset as a digital status corresponding to the voltage V1 is set as a digital stator for the voltage Vα, and traveling control is performed so that the traveling state becomes a state corresponding to the digital status. ing.

Japanese Patent No. 3333277 (page 3-10, FIGS. 1 to 3) Japanese Patent No. 3257417 (page 4-6, FIGS. 1 to 3)

However, in the conventional conversion process as described above, the detected analog voltage is replaced with a predetermined voltage value (representative value) corresponding to a voltage range determined according to the magnitude of the voltage, and thereafter Since the digital status is determined for the replacement value, the number of voltage ranges (regions) to be determined, that is, the step of determining the voltage range as the number of regions increases, Since the number of steps for performing replacement increases, there is a problem in that the load on the CPU that executes this process increases.
In addition, as the number of voltage areas to be determined increases as described above, the number of software source code lines also increases, which causes a problem of inducing work errors in coding work and the like.

  The present invention has been made in view of the above circumstances, and an analog / digital status conversion method that enables conversion to a digital status without increasing the burden on the CPU as much as possible even if the number of voltage ranges to be determined increases. An apparatus using this is provided.

In order to achieve the above object of the present invention, an analog / digital status conversion method according to the present invention comprises:
An analog / digital status conversion method for converting an analog signal into a digital status,
It is determined which of a plurality of predetermined determination areas the input analog signal corresponds to, and a digital status set in advance for the determined area is changed to digital for the input analog signal. It is configured to output as a status.
In order to achieve the object of the present invention, a vehicle travel control device according to the present invention includes:
A cruise switch unit configured to generate and output a voltage corresponding to the pressed switch, and a plurality of switches for setting the driving state, and to control the driving state of the vehicle according to the output voltage of the cruise switch unit A vehicle travel control device comprising an electronic control unit configured to:
The electronic control unit is
It is determined whether the output voltage of the close switch unit corresponds to a plurality of predetermined determination areas, and a digital status set in advance for the determined area is determined based on the input analog voltage. The digital status is configured so that predetermined control can be executed according to the digital status.

According to the present invention, unlike the conventional case, the digital status can be obtained without once converting the input analog voltage into a voltage suitable for digital status conversion. There is an effect that the conversion process can be easily executed in a relatively short time as compared with the prior art without squeezing the processing capability in a computer or the like.
In addition, according to the present invention, since there is no restriction on the width of the determination area and the correlation between each determination area and the digital status, not only is the degree of freedom of design high, but even after the design once. , The number of judgment areas and their size can be changed, and the digital status can be changed freely. Unlike conventional models, the versatility is high and the usability can be greatly improved compared to conventional models. It has the effect of being able to do it.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 5.
The members and arrangements described below do not limit the present invention and can be variously modified within the scope of the gist of the present invention.
First, a configuration example of a vehicle control device in which an analog / digital status conversion method according to an embodiment of the present invention is used will be described with reference to FIG.
The vehicle control device according to the embodiment of the present invention is a configuration example that is particularly suitable for constant speed traveling control of a vehicle generally referred to as auto cruise or cruise control. Such a vehicle control apparatus includes a cruise switch unit 101 for setting a traveling state, and an electronic control unit ("ECU" in FIG. 1) that controls the injection operation of the injector 103 in accordance with an output signal of the cruise switch unit 101. (Notation) 102.

  The cruise switch unit 101 includes a main switch (indicated as “MAIN” in FIG. 1), a cancel switch (indicated as “CNACEL” in FIG. 1) 2, and a set / coast switch (in FIG. 1, “SET / COAST ”(noted as“ COAST ”) 3 and a resume / accelerator switch (noted as“ RES / ACCEL ”in FIG. 1) 4 and first to second voltage signals for generating voltage signals corresponding to the opening and closing of these switches. 5 resistors 5a to 5e.

The first to fifth resistors 5a to 5e are connected in series, and one end is connected to the ground, while the other end side is applied with the power supply voltage Vdc.
One end of the main switch 1 is connected to the connection point between the first resistor 5a and the second resistor 5b, and one end of the cancel switch 2 is connected to the second resistor 5b and the third resistor 5c. At the connection point, the set course and the switch 3 are connected to the connection point between the third resistor 5c and the fourth resistor 5d, and the resume accelerator switch 4 is connected to the fourth resistor 5d and the fifth resistor. The other end of each of the switches 1 to 4 is connected to the ground while being connected to a connection point with 5e.

The connection point between the first resistor 5a and the second resistor 5b is connected to an electronic control unit 102, which will be described later, as an output terminal of the switches 1-4.
Each of the switches 1 to 4 in the embodiment of the present invention is a so-called automatic return type switch, and is in an off state (open state) in a normal state, that is, in a state where the switch is not pressed. By doing so, it is in an on state (closed state), and the on state is continued while being pressed, and when it is stopped, it automatically returns to the off state.

Accordingly, during normal times, the output voltage to the electronic control unit 102 as the cruise switch unit 101 is a voltage Va corresponding to the voltage drop in the second to fifth resistors 5b to 5e.
The output voltage Vb to the electronic control unit 102 when the main switch 1 is pressed and turned on is in a state where the output point as the cruise switch unit 101 is connected to the ground via the main switch 1. Vb = 0V.

Next, when the cancel switch 2 is pressed and turned on, the voltage Vc corresponding to the voltage drop in the second resistor 5 b becomes an output as the cruise switch unit 101.
When the set / coast switch 3 is pressed and turned on, the voltage Vd corresponding to the voltage drop in the second and third resistors 5b and 5c is output as the cruise switch unit 101.

Further, when the resume / accelerator switch 4 is pressed and turned on, the voltage Ve corresponding to the voltage drop in the second to fourth resistors 5b to 5d becomes an output as the cruise switch unit 101.
Therefore, the relationship Va>Ve>Vd>Vc> Vb is established.

The electronic control unit 102 has, for example, a microcomputer (not shown) having a known and well-known configuration, a storage element (not shown) such as a RAM and a ROM, and drives the injector 103. The drive circuit (not shown) for this is comprised as a main component.
The electronic control unit 102 includes various sensors (for detecting the vehicle speed necessary for cruise control, the presence or absence of depression of an accelerator pedal (not shown), the temperature of engine coolant, and the like). A detection signal from (not shown) is input.
Further, FIG. 1 shows a schematic configuration of software processing functions related to cruise control, particularly in the electronic control unit 102.

In the embodiment of the present invention, when the output voltage of the cruise switch unit 101 is input to the electronic control unit 102, an analog / digital status conversion process is performed as will be described later, in accordance with the input analog voltage. It is converted to digital status and used for auto cruise processing.
The auto-cruise process controls the fuel injection operation in the injector 103 in order to realize constant speed traveling control according to the set state (pressed state) of each of the switches 1 to 4 in the cruise switch unit 101. is there.

  In the auto-cruise processing in the embodiment of the present invention, even when the switch configuration in the cruise switch unit 101 is different from the switch setting set in the auto-cruise processing, the cruise control is performed accordingly. A status input processing function for converting the digital status obtained by the analog / digital status conversion processing is provided (details will be described later).

  When the cruise control corresponding to the set state of the cruise switch unit 101 is selected in the auto-cruise process, an engine output torque calculation process corresponding to that is performed, and then the injector injection amount corresponding to the calculated engine output torque is determined by the injector. It is set by the injection amount processing, and fuel injection control is performed on the injector 103 for constant speed running.

Next, regarding the analog / digital status conversion processing executed in the electronic control unit 102, refer to the subroutine flowchart shown in FIG. 2 and the explanatory diagram for explaining the output characteristics of the digital status with respect to the analog input shown in FIG. However, it will be explained.
When the process is started, it is determined whether or not the input voltage x from the cruise switch unit 101 to the electronic control unit 102 is in the first range (see step S100 in FIG. 2). In the embodiment of the present invention, the first range is set to zero V or more and less than the predetermined value x1 (V). Therefore, in step S100, it is determined whether or not 0 ≦ x <x1.
When it is determined that the input voltage x is within the first range (in the case of YES), y0 is assigned as the digital status y, a series of processing is terminated, and the process returns to the main routine (not shown). On the other hand, when it is determined that the input voltage x is not in the first range (in the case of NO), the process proceeds to step S102 described below.

Here, the analog / digital status conversion characteristics in the embodiment of the present invention will be described with reference to FIG.
FIG. 3 is an explanatory diagram for explaining the conversion characteristics of an analog input into a digital status according to the embodiment of the present invention, in which the horizontal axis indicates an analog input, and the vertical axis indicates a converted digital status. Represents.
In this example, the analog inputs have a magnitude relationship of x1 <x2 <x3 <x4 <x5. In addition, the digital status is specifically a digital code determined for distinguishing the control state in the auto-cruise processing and is not originally in a magnitude relationship, but in FIG. The display positions are different in the vertical axis direction.
And what kind of digital status is assigned to each analog input differs depending on the specific device in which the analog / digital status conversion process is used, and FIG. 3 is merely an example.

  In the example shown in FIG. 3, when the analog input is 0 to x1, the digital status is y0. When the analog input is x1 to x2, the digital status is y1 and the analog input is x2 to x3. The digital status is y2, the analog status is x3 to x4, the digital status is y3, and the analog input is x4 to x5, the digital status is y4 and the analog input is x5 or more The digital status is set to y5.

Here, returning to the description of FIG. 2 again, in step S102, it is determined whether or not the input voltage x is in the second range. In the embodiment of the present invention, the second range is set to be equal to or greater than the predetermined value x1 (V) and less than the predetermined value x2 (V).
Therefore, in step S102, it is determined whether or not x1 ≦ x <x2.

  When it is determined in step 102 that the input voltage x is in the second range (in the case of YES), y1 is assigned as the digital status y (see step S114 in FIG. 2 and FIG. 3). When it is determined that the input voltage x is not in the second range (in the case of NO), the process proceeds to step S104 described below.

In step S104, it is determined whether or not the input voltage x is in the third range. In the embodiment of the present invention, the third range is set to be equal to or greater than the predetermined value x2 (V) and less than the predetermined value x3 (V).
Therefore, in step S104, it is determined whether or not x2 ≦ x <x3.

  If it is determined in step 104 that the input voltage x is in the third range (in the case of YES), y2 is assigned as the digital status y (see step S116 in FIG. 2 and FIG. 3). When it is determined that the input voltage x is not within the third range (in the case of NO), the process proceeds to step S106 described below.

In step S106, it is determined whether or not the input voltage x is in the fourth range. In the embodiment of the present invention, the fourth range is set to be equal to or greater than the predetermined value x3 (V) and less than the predetermined value x4 (V).
Therefore, in step S106, it is determined whether or not x3 ≦ x <x4.

  When it is determined in step 106 that the input voltage x is in the fourth range (in the case of YES), y3 is assigned as the digital status y (see step S118 in FIG. 2 and FIG. 3). If it is determined that the input voltage x is not in the fourth range (in the case of NO), the process proceeds to step S108 described below.

In step S108, it is determined whether or not the input voltage x is in the fifth range. In the embodiment of the present invention, the fifth range is set to be equal to or greater than the predetermined value x4 (V) and less than the predetermined value x5 (V).
Therefore, in step S108, it is determined whether or not x4 ≦ x <x5.

  If it is determined in step 108 that the input voltage x is in the fifth range (in the case of YES), y4 is assigned as the digital status y (see step S120 in FIG. 2 and FIG. 3). When it is determined that the input voltage x is not in the fifth range (in the case of NO), the process proceeds to step S110 described below.

In step S110, it is determined whether or not the input voltage x is in the sixth range. In the embodiment of the present invention, the sixth range is set to a predetermined value x5 (V) or more.
Therefore, in step S110, it is determined whether or not x5 ≦ x.

  In step 110, when it is determined that the input voltage x is in the sixth range (in the case of YES), y5 is assigned as the digital status y (see step S122 in FIG. 2 and FIG. 3). When it is determined that the input voltage x is not in the fifth range (in the case of NO), a series of processing is terminated.

In the case of the processing procedure shown in FIG. 2, every time the input voltage x is input, the overlapping processing is repeated, and the load on the ECU 102 is increased.
That is, for example, even if the input voltage x in the previous process is x5 and the current input voltage x is x5 again, the processing is executed in order from step S100.
From the viewpoint of eliminating such processing waste and reducing the load on the ECU 102, as in the second embodiment described below, a step that can be omitted from the relationship with the previous input voltage x is described in the processing. May be omitted.
The second embodiment will be described below with reference to FIG.

First, it is assumed that the latest input voltage x is stored until a new input voltage x is input. Specifically, the output voltage of the cruise switch unit 101 is stored in an appropriate storage area of the ECU 102.
When the process is started, it is determined whether or not the input voltage x is larger than the value of the input voltage in the previous process (see step S150 in FIG. 6).
When it is determined that the input voltage x is larger than the input voltage at the time of the previous process (in the case of YES), the area where the determination voltage is larger than the area where the conversion to the digital status with respect to the previous input voltage is performed The input voltage falls within which range and conversion to digital status is performed (see step S152 in FIG. 6).

For example, if the previous input voltage X is a voltage corresponding to the fourth range (x3 ≦ x <x4) described above and the current input voltage x is larger than that, for example, 3, it is sufficient to perform determination and conversion processing in a range larger than x4. That is, the digital status can be converted by executing only step S108 and subsequent steps in FIG.
On the other hand, if it is determined in step S150 that the input voltage x is not greater than the input voltage in the previous process (in the case of NO), the input voltage x is the value of the input voltage in the previous process. It is determined whether or not it is smaller (see step S154 in FIG. 6).

When it is determined that the input voltage x is smaller than the input voltage at the time of the previous processing (in the case of YES), the region where the determination voltage is smaller than the region where the conversion to the digital status with respect to the previous input voltage is performed The input voltage falls within which range, and the digital status is converted (see step S156 in FIG. 6).
For example, if the previous input voltage X corresponds to the fourth range (x3 ≦ x <x4) described above and the current input voltage x is smaller than that, In terms of 3, it is sufficient to perform determination and conversion processing in a range smaller than x4. That is, the digital status can be converted by executing only steps S100 to S104 in FIG.

On the other hand, if it is determined in step S154 that the input voltage x is not smaller than the input voltage in the previous process (in the case of NO), the determination range for the previous value is maintained.
That is, in this case, as a result, the same digital status as the previous time is obtained.
In this way, by restricting the input range determination area in the unlog / digital status conversion process depending on whether the size of the analog input is larger or smaller than the previous value, it avoids redundant useless processing. The load on the ECU 102 can be reduced.

Next, the analog / digital status conversion process for the input from the cruise switch unit 101 will be described more specifically. First, when the main switch 1 is pressed and turned on, the electronic control unit 102 is As described above, Vb = 0V is input.
Therefore, in this case, since the input voltage x = 0, it is determined that the input voltage is in the first range (see step S100 in FIG. 2), and the digital status y0 is subjected to the auto-cruise process.

Next, when the cancel switch 2 is pressed and turned on, the voltage Vc is input to the electronic control unit 102.
Here, as described above, the output voltage of the cruise switch unit 101 in the embodiment of the present invention has a relationship of Va>Ve>Vd>Vc> Vb = 0, which are shown in FIG. In the example shown, assume the following range.
That is, Vb is in the first range (0 ≦ x <x1), Vc is in the second range (x1 ≦ x <x2), and Vd is in the third range (x2 ≦ x <x3). It is assumed that Ve is in the fourth range (x3 ≦ x <x4) and Va is in the fifth range (x4 ≦ x <x5).
Therefore, when the cancel switch 2 is pressed and turned on, the digital status y1 is used for the auto cruise process.

Next, when the set / coast switch 3 is pressed and turned on, the voltage Vd is input to the electronic control unit 102. Therefore, the digital status y2 is used for the auto cruise process.
When the resume / accelerator switch 4 is pressed and turned on, the voltage Ve is input to the electronic control unit 102. Therefore, the digital status y3 is used for the auto cruise process.
When all the switches 1 to 4 are in the off state, the voltage Va is input to the electronic control unit 102, and the digital status y4 is subjected to the auto cruise process.

As described above, in the embodiment of the present invention, the analog voltage output from the cruise switch unit 101 is directly converted into the corresponding digital status depending on the voltage range, and is used for the auto-cruise processing. Therefore, the burden of software processing in the electronic control unit 102 can be reduced as compared with the conventional case.
In the above configuration example, the analog input can be converted into six digital statuses y0 to y5. However, this is only an example, and of course, the present invention is not limited to this. It may be set appropriately.

  Next, in the cruise control process executed in the electronic control unit 102, when the originally assumed switch type and configuration of the cruise switch unit 101 are different, the cruise control process is executed smoothly. The status input process to be performed will be described with reference to FIGS.

First, the type and function of the original cruise switch assumed by the cruise control process according to the embodiment of the present invention and the differences between the switches 1 to 4 in the cruise switch unit 101 shown in FIG. 1 will be described.
First, in the cruise control process according to the embodiment of the present invention, four switches that are originally denoted as “Set +”, “Set−”, “Resume”, and “Cancel” are switches for setting the cruise control. Assumes that

  “Set +” is a switch used for setting and accelerating the target vehicle speed. For example, when “Set +” is pressed in a normal driving state, that is, in a state where cruise control is not executed. The vehicle speed at that time is set as the target vehicle speed, and engine control is performed by cruise control processing so that the vehicle travels at the target vehicle speed, that is, travels at a constant speed. When this “Set +” is pressed during constant speed traveling, the target speed is gradually increased (accelerated) while the button is being pressed.

  “Set-” is a switch used to set and decelerate the target vehicle speed. For example, when “Set-” is pressed in a normal driving state, that is, in a state where cruise control is not executed. The vehicle speed at that time is set as the target vehicle speed, and engine control is performed by cruise control processing so that the vehicle travels at the target vehicle speed, that is, travels at a constant speed. When this “Set−” is pressed during constant speed travel, the target speed is gradually reduced (decelerated) while the button is being pressed.

“Resume” is a switch for returning (returning) from the current control state to the most recent previous control state. For example, when this switch is pressed in a normal running state, the latest constant speed running is performed. “Cancel” is controlled so as to return to the state. When this switch is pressed, control is performed so as to return to the normal running state. When the Resume switch is pressed again, control is performed so as to return to constant speed traveling at the vehicle speed stored in the previous constant speed traveling control.

On the other hand, the functions required for the main switch 1, the cancel switch 2, the set / coast switch 3 and the resume / accelerator switch 4 in the cruise switch unit 101 according to the embodiment of the present invention are as follows. .
First, the main switch 1 is for setting on / off of cruise control (auto-cruise processing). When the main switch 1 is pressed in a normal driving state, the cruise control is started. When the main switch 1 is pressed in a state where the cruise control is being performed, that is, in the constant speed traveling state, the cruise control control is turned off to return to the normal traveling state.

Next, the cancel switch 2 is for turning off the cruise control control. When the cancel switch 2 is pressed during the constant speed traveling by the cruise control control, the constant speed traveling by the cruise control control is terminated and the normal traveling state is restored. It is what you want to do.
The set / coast switch 3 has a function of switching between two control states of a set function and a coast function. That is, one of them is that the constant speed traveling state by the cruise control control is performed at the traveling speed at that time when pressed in the normal traveling state (set function). Secondly, the vehicle speed is decelerated by being pressed during constant speed traveling under cruise control control, and the deceleration is continued while the vehicle is being depressed. By stopping the depression, the vehicle speed at that time is constant. It is intended to keep high speed running (coast function).

  Next, the resume / accelerator switch 4 has a switching function between two control states of a resume function and an accelerator function. That is, one is that the vehicle speed is changed to the vehicle speed set by the most recent operation of the set / coast switch 3 when pressed in a normal driving state, and the vehicle speed is constant at the vehicle speed by cruise control control. It is intended to run (resume function). Second, when pressed while driving at a constant speed under cruise control control, the acceleration state is established, acceleration during pressing continues, and when the pressing is stopped, the acceleration is stopped, and the vehicle speed at that time is constant. It is intended to keep running (accelerator function).

Next, the entire processing procedure of the status input processing in the embodiment of the present invention will be described with reference to the subroutine flowchart shown in FIG.
When the status input process is started, the digital status obtained according to the output voltage of the cruise switch unit 101 is input by the analog / digital status conversion process described above with reference to FIG. 2 (FIG. 4). Step S200).

  Next, status input processing for converting the input digital status into a corresponding status in the auto-cruise processing is performed (see step S300 in FIG. 4), and selection of a control state according to the converted status, Then, mode selection is performed (see step S400 in FIG. 4), a series of processing ends, the process shifts to auto-cruising processing, and traveling control selected by mode selection is performed.

Next, a status conversion procedure by status input processing (see step S300 in FIG. 4) in the embodiment of the present invention will be described with reference to FIG.
In the auto-cruise processing according to the embodiment of the present invention, as described above, it is assumed that the control is switched by four cruise switches of “Set +”, “Set−”, “Resume”, and “Cancel”. The function of is as described above.
On the other hand, in the cruise switch unit 101, four switches 1 to 4 are provided. As described above, the functions required for each switch are those of the switch originally assumed for the auto cruise processing. It is different from the function.

However, since the control to be realized is almost the same, the digital status obtained in accordance with the switch operation of the cruise switch unit 101 is realized in the auto-cruise process so that there is no problem. Therefore, in the embodiment of the present invention, necessary conversion processing is performed using the concept of a status machine.
That is, first, in the status input process, the digital status obtained by the analog / digital status conversion process according to the operation state of the switches 1 to 4 of the cruise switch unit 101 and the information on the state of the cruise control control Therefore, the state (control state) at that time is determined.
For example, in the cruise switch unit 101, when any of the switches 1 to 4 is in the OFF state and the cruise control control is not performed, that is, in the normal running state, the state is recognized as the state 1. (See FIG. 5).

  In this state, for example, when the main switch 1 is pressed, there is no function corresponding to “Set +”, “Set−”, “Resume”, and “Cancel”, and special control is required. Therefore, state 1 is maintained as it is. After that, for example, if the set / coast switch 3 is pressed, this state is a case where a constant speed driving state at the current speed is requested from the normal driving state, and “Set +” is pressed. In this case, the state is equivalent to a predetermined “Set +”. That is, in other words, a predetermined digital code is generated and used for auto-cruise processing. At this time, at the same time, in this state, that is, in the state 1 state, the set course and the switch 3 are pressed and the state where the vehicle is in the constant speed running state by the auto-cruise processing is recognized as the state 2 (See FIG. 5).

In the state 2 state, for example, if the resume / accelerator switch 4 of the cruise switch unit 101 is pressed, this situation is a state where acceleration is required, and “Set +” is pressed in the constant speed running state. It is assumed that the status is predetermined for such a state. That is, in other words, a predetermined digital code is generated and used for auto-cruise processing.
As a result, the vehicle speed is accelerated while the resume / accelerator switch 4 is pressed, and when the resume / accelerator switch 4 is turned off, the constant speed traveling state is maintained at the vehicle speed at that time.
Then, this state is recognized as, for example, state 3, and becomes a standby state for a new input of a digital status according to the switch operation of the cruise switch unit 101 (see FIG. 5).

  Hereinafter, as described above, from the digital status obtained according to the switch operation of the cruise switch unit 101, the state up to that point, and the state of cruise control including the presence or absence of cruise control up to that point, By determining the state corresponding to the control to be performed, the function of the switch of the cruise switch unit 101 and the switching of the cruise control control defined in advance in the auto cruise process executed in the electronic control unit 102 are performed. Conversion with the function of each switch is made (see FIG. 5).

In the above-described configuration example, the cruise switch unit 101 has four switches 1 to 4. However, the application of the present invention is not limited to the above-described configuration, and the cruise switch unit 101 switches. Of course, in the case where the number is larger or smaller than that in the above configuration example, the present invention can be applied in any case in the same manner as described above.
In the analog / digital status conversion method according to the embodiment of the present invention, the voltage signal is converted into the digital status. However, the analog signal is not necessarily an analog voltage, and other analog values such as an analog current are used. However, it can be applied basically in the same manner.

It is a block diagram which shows the structural example of the vehicle control apparatus with which the analog / digital status conversion method in embodiment of this invention is used. It is a subroutine flowchart which shows the procedure of the analog / digital status conversion process performed with the electronic control unit of the vehicle control apparatus shown by FIG. It is explanatory drawing explaining the output characteristic of the digital status with respect to the analog input by the analog-digital status conversion process in embodiment of this invention. It is a subroutine flowchart which shows the procedure of the status input process in embodiment of this invention. It is explanatory drawing explaining the status conversion procedure in embodiment of this invention. It is a subroutine flowchart which shows the process sequence in the 2nd Example of the analog / digital status conversion process performed with the electronic control unit of the vehicle control apparatus shown by FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Main switch 2 ... Cancel switch 3 ... Set / coast switch 4 ... Reset accelerator switch 101 ... Cruise switch part 102 ... Electronic control unit 103 ... Injector

Claims (2)

An analog / digital status conversion method for converting an analog signal into a digital status,
It is determined which of a plurality of predetermined determination areas the input analog signal corresponds to, and a digital status set in advance for the determined area is changed to digital for the input analog signal. An analog / digital status conversion method characterized by outputting as a status. A cruise switch unit configured to generate and output a voltage corresponding to the pressed switch, and a plurality of switches for setting the driving state, and to control the driving state of the vehicle according to the output voltage of the cruise switch unit A vehicle travel control device comprising an electronic control unit configured to:
The electronic control unit is
It is determined whether the output voltage of the close switch unit corresponds to a plurality of predetermined determination areas, and a digital status set in advance for the determined area is determined based on the input analog voltage. The vehicle travel control device is configured to be capable of executing predetermined control according to the digital status.

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