JP2007290488A - On-vehicle equipment control system and on-vehicle equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide on-vehicle equipment control system and on-vehicle equipment capable of eliminating the influence of noise from a second on-vehicle equipment to a first on-vehicle equipment such as a radio receiver and a television receiver having a radio communicating function. <P>SOLUTION: The radio receiver 1 transmits frequency information indicating receiving frequency of a radio broadcast set by an operating portion 13 to an ECU 2 of an EPS through an in-vehicle LAN 3. When the receiving frequency indicated by the received frequency information matches with the clock frequency of a CPU 20 or the frequency of harmonic waves of a clock, the CPU 20 of the ECU 2 controls a clock generater 21 to change a value of the clock frequency to a proper value of the clock frequency which makes the radio receiver 1 hard to catch noise due to the clock of the ECU 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an in-vehicle device control system and an in-vehicle device in which a plurality of in-vehicle devices are connected to an in-vehicle LAN.

  The in-vehicle device is configured such that an electronic component such as an MPU (microprocessor unit) or a DSP (Digital Signal Processor) included in the in-vehicle device operates according to a clock input to the electronic component itself. In addition, wireless communication devices such as a radio receiver and a television receiver are configured such that a user sets a reception frequency and receives a radio wave having the set reception frequency wirelessly from the outside.

Conventionally, for example, the frequency of a control signal for driving and controlling an electric motor driving means for driving an in-vehicle electric motor for EPS (electric power steering system) is an integral multiple of a frequency interval of a reception frequency assigned to an AM radio broadcasting station or There has been proposed an electric motor drive device that suppresses the influence of noise derived from a control signal from adversely affecting an AM radio receiver by setting to “integer + 0.5” times (see Patent Document 1).
Japanese Patent No. 3390332

  By the way, when the clock frequency of the in-vehicle device or the frequency of the harmonics of the clock matches the frequency of the reception frequency, the radio communication device receives the radiation / conduction noise derived from the clock derived from the in-vehicle device, and the radio sound, television Viewing screens may be difficult.

However, in the electric motor drive device of Patent Document 1, only the relationship between the frequency of the control signal for driving and controlling the electric motor driving means for driving the in-vehicle electric motor and the reception frequency of the AM radio receiver is considered.
In addition, since the frequency of the control signal is a constant frequency according to the frequency interval of the reception frequency, when wireless communication devices with different frequency intervals of the reception frequency coexist, noise derived from the control signal adversely affects the wireless communication device. Can be considered.

  By the way, in recent years, it has been considered that a vehicle is equipped with an in-vehicle LAN, and in-vehicle devices connected to the in-vehicle LAN communicate with each other.

  This invention is made | formed in view of such a situation, The main objective is that the 1st frequency of a 1st vehicle-mounted apparatus differs from the 2nd frequency of a 2nd vehicle-mounted apparatus, and the frequency of a harmonic, respectively. By setting it as the structure which changes the value of a 2nd frequency, it is providing the vehicle equipment control system and vehicle equipment which can remove the bad influence of the noise from the 2nd vehicle equipment with respect to a 1st vehicle equipment.

  Another object of the present invention is that the first in-vehicle device communicates wirelessly using the set signal of the first frequency, and the second frequency of the second in-vehicle device is set as the second frequency and the harmonic frequency. A vehicle-mounted device control system capable of removing the adverse effects of noise from the second vehicle-mounted device on the first vehicle-mounted device, which is a wireless communication device, by changing the first frequency to be different from each other. There is to do.

  An in-vehicle device control system according to a first invention is an in-vehicle device control system comprising a plurality of in-vehicle devices connected to an in-vehicle LAN, wherein the first in-vehicle device is a signal processing means for processing a signal having a first frequency; Transmitting means for transmitting frequency information indicating the first frequency to the second in-vehicle device via the in-vehicle LAN, wherein the second in-vehicle device includes an oscillating means for oscillating the second frequency, and the in-vehicle LAN. A receiving unit that receives frequency information from the first vehicle-mounted device via a determination, and a determination that determines whether the second frequency or the harmonic frequency matches a frequency indicated by the frequency information received by the receiving unit And a changing means for changing the second frequency oscillated by the oscillating means to a different value so as not to match when it is determined that the determining means match.

  In the in-vehicle device control system according to a second aspect of the invention, the first in-vehicle device has setting means for setting a first frequency, and the signal processing means has the first frequency set by the setting means. The wireless communication means wirelessly communicates with the outside using a signal.

  An in-vehicle device according to a third invention is an in-vehicle device connected to an in-vehicle LAN, an oscillating unit that oscillates a predetermined frequency, and a receiving unit that receives frequency information indicating a frequency from the outside via the in-vehicle LAN, If the determination means determines whether the predetermined frequency or the harmonic frequency matches the frequency indicated by the frequency information received by the reception means, and the determination means determines that they match, the oscillation means oscillates And changing means for changing the frequency to be different so as not to match.

  In the case of the vehicle-mounted device control system according to the first invention and the vehicle-mounted device according to the third invention, the value of the second frequency is changed so as not to coincide with the first frequency. It is possible to reliably suppress the adverse effects of noise.

  In the case of the in-vehicle device control system according to the second invention, the second frequency value is changed so as not to coincide with the first frequency used for wireless communication. 2 It is possible to reliably suppress the adverse effects of noise derived from on-vehicle equipment.

  Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.

FIG. 1 is a block diagram showing a configuration of an in-vehicle device control system according to the present invention.
The in-vehicle device control system includes a plurality of in-vehicle devices connected to the in-vehicle LAN 3. This in-vehicle device is a first in-vehicle device having a signal processing unit and a transmission unit, and a second in-vehicle device having an oscillating unit, a receiving unit, a determining unit, and a changing unit.

The first vehicle-mounted device is a vehicle-mounted wireless communication device such as the radio receiver 1 and the television receiver 5. The second in-vehicle devices are an EPS ECU (Electronic Control Unit) 2, a car navigation system (car navigation) 4, an engine ECU 6, and the like.
In order to prevent the second in-vehicle device from interfering with the first in-vehicle device due to noise, the first in-vehicle device in the present embodiment provides frequency information indicating the set reception frequency as described later. The second in-vehicle device is configured to transmit to the device, and is configured to actively change the value of the clock frequency used by the second in-vehicle device based on the received frequency information.

In addition, although radio | wireless communication apparatuses, such as the radio receiver 1 and the television receiver 5, are 1st vehicle-mounted apparatuses, in addition to this, it is preferable to also have a function as a 2nd vehicle-mounted apparatus. The first in-vehicle device may be a wireless communication device that performs not only wireless reception from the outside but also wireless transmission to the outside.
Hereinafter, for the sake of simplicity, the radio receiver 1 that is the first in-vehicle device and the ECU 2 of the EPS that is the second in-vehicle device (hereinafter referred to as ECU 2 for short) will be described as an example.

The radio receiver 1 includes a CPU 10, a clock generator 11 that generates a clock and outputs the clock to each part of the radio receiver 1, an I / F 12 that is an interface between the radio receiver 1 and the in-vehicle LAN 3, an operation unit 13, and a radio unit 14 and the speaker 15 are electrically connected to each other via a bus or a signal line.
The CPU 10 of the radio receiver 1 operates according to the clock generated by the clock generator 11 at a predetermined clock frequency. Specifically, the CPU 10 uses a RAM (not shown) as a work area, controls each part of the radio receiver 1 according to a control program and data stored in a ROM (not shown), and executes various processes.

The operation unit 13 of the radio receiver 1 is provided for the user of the radio receiver 1 to set the frequency (reception frequency) assigned to the radio broadcasting station, and the user operates to set the reception frequency. There are knobs, switches, etc.
Such an operation unit 13 functions as a setting unit for setting the first frequency.
The user selects a desired radio broadcast station by operating the operation unit 13.
The operation unit 13 outputs data indicating the reception frequency set by the user by operating the operation unit 13 to the CPU 10 and the wireless unit 14.

The radio unit 14 of the radio receiver 1 is a radio wave receiver, and receives a signal having a reception frequency (first frequency) set by the operation unit 13 from the outside, specifically, from a radio broadcasting station. . The radio unit 14 outputs an audio signal obtained by demodulating the received signal to the speaker 15, and the speaker 15 of the radio receiver 1 generates audio based on the input audio signal.
Such a radio | wireless part 14 functions as a signal processing means which processes the signal which has a 1st frequency. That is, the wireless unit 14 functions as a wireless communication unit that wirelessly communicates with the outside using the signal having the first frequency set by the setting unit.

The CPU 10 having received the data indicating the reception frequency set by operating the operation unit 13 by the user transmits frequency information indicating the input reception frequency to the ECU 2 via the I / F 12 and further via the in-vehicle LAN 3. To do.
When a plurality of second in-vehicle devices such as the ECU 2 are connected to the in-vehicle LAN 3, frequency information may be transmitted indiscriminately from the first in-vehicle device to all the second in-vehicle devices. The frequency information may be selectively transmitted to the second in-vehicle device.

The ECU 2 includes a CPU 20, a clock generator 21 that generates a clock having a predetermined clock frequency (second frequency) and outputs the clock to each part of the ECU 2, an I / F 22 that is an interface between the ECU 2 and the in-vehicle LAN 3, and a functional unit 23. , Electrically connected to each other via a bus or a signal line.
Such a clock generator 21 functions as an oscillating means for oscillating the second frequency. Further, the clock generator 21 is configured to be able to change the value of the clock frequency of the generated clock under the control of the CPU 20.

The CPU 20 of the ECU 2 operates in accordance with a clock generated by the clock generator 21 at a predetermined clock frequency (second frequency). Specifically, the CPU 20 uses a RAM (not shown) as a work area, controls each part of the ECU 2 according to a control program and data stored in a ROM (not shown), and executes various processes.
The CPU 20 receives the frequency information transmitted from the radio receiver 1 via the in-vehicle LAN 3 via the I / F 22. Further, the CPU 20 controls the clock generator 21 based on the reception frequency indicated by the received frequency information to change the value of the clock frequency as will be described later.

  The function unit 23 of the ECU 2 is configured such that the steering torque applied to the steering wheel for steering the vehicle is detected, and the CPU 20 drives and controls the steering assist electric motor based on the detected torque.

Next, a procedure of frequency transmission processing executed by the CPU 10 of the radio receiver 1 will be described.
When the switch of the radio receiver 1 is turned on, the CPU 10 determines whether or not data indicating the reception frequency set by the user operating the operation unit 13 is input from the operation unit 13. It is determined whether or not the user has selected a channel.

When the user selects a channel, the CPU 10 transmits frequency information indicating the reception frequency set by the user's channel selection to the ECU 2 via the I / F 12 and the in-vehicle LAN 3.
Note that it is not necessary to transmit to the ECU 2 a frequency that is not assigned to the radio broadcast station. In addition, when the user repeats channel selection many times in a short time, the frequency information is transmitted for each channel selection to prevent the data processing amount of the radio receiver 1 and ECU 2 from becoming excessive. Thereafter, the frequency information may be transmitted when an appropriate time has elapsed (when the user completes channel selection).

If the user has not selected the channel, the CPU 10 determines, for example, whether or not the switch of the radio receiver 1 has been turned off. If not, the CPU 10 waits until the user selects a channel and turns it off. If so, the frequency transmission process is terminated.
In the frequency transmission process as described above, the CPU 10 and the I / F 12 function as a transmission unit that transmits frequency information indicating the first frequency to the second in-vehicle device via the in-vehicle LAN 3.

FIG. 2 is a flowchart showing a procedure of frequency change processing executed by the CPU 20 of the ECU 2.
When the ECU 2 is on, the CPU 20 determines whether or not frequency information is received from the radio receiver 1 via the I / F 22 and the in-vehicle LAN 3 (S21).

When the frequency information is received (YES in S21), the CPU 20 calculates a frequency used for the determination in S23 described later based on the reception frequency indicated by the frequency information received in S21 (S22).
The frequency calculated in S22 is a harmonic frequency of the clock that is currently generated by the clock generator 21 at the time when the process of S22 is performed. Here, the frequency of the harmonic is calculated corresponding to an appropriate integer of “2” or more, and the calculated maximum frequency is set to be equal to or higher than the reception frequency indicated by the frequency information received in S21.

  After completing the process of S22, the CPU 20 matches the clock frequency of the clock currently generated by the clock generator 21 and the harmonic frequency calculated in S22 with the reception frequency indicated by the frequency information received in S21. It is determined whether or not (S23).

When the clock frequency or the harmonic frequency matches the reception frequency (YES in S23), the ECU 2 interferes with the radio receiver 1 by continuously using the clock frequency currently used, and the speaker of the radio receiver 1 is used. Since there is a possibility that noise is output from 15, the CPU 20 calculates the value of the frequency for change in order to change the clock frequency (S24).
The calculation of the clock frequency in S24 may be, for example, a value stored in advance in the ROM corresponding to the reception frequency, or may be determined based on a mathematical expression stored in advance in the ROM.

After completing the process of S24, the CPU 20 controls the clock generator 21 to change the clock frequency value of the clock generated by the clock generator 21 to the clock frequency value calculated in S24 (S25).
After completing the process of S25, the CPU 20 returns the process to S21.

  If the clock frequency and the harmonic frequency do not all coincide with the reception frequency (NO in S23), the ECU 20 does not interfere with the radio receiver 1 even if the clock frequency currently used is continuously used. Returns the process to S21 without changing the value of the clock frequency.

  When the frequency information is not received (NO in S21), the CPU 20 determines whether or not the ECU 2 is turned off (S26). When the ECU 2 is not turned off (NO in S26), the process is performed in S21. If it is turned off and turned off (YES in S26), the frequency changing process is terminated.

In S21 of the frequency changing process as described above, the CPU 20 and the I / F 22 function as a receiving unit that receives frequency information from the first in-vehicle device via the in-vehicle LAN 3.
Further, the CPU 20 in S23 functions as a determination unit that determines whether the second frequency or the harmonic frequency matches the frequency indicated by the frequency information received by the reception unit.
Further, the CPU 20 and the clock generator 21 in S25 function as changing means for changing the second frequency oscillated by the oscillating means to a different value when it is determined that the determining means match.

The in-vehicle device control system as described above includes a plurality of in-vehicle devices that can be connected via an in-vehicle network, and sets the clock frequency of at least one other in-vehicle device according to the operating frequency (reception frequency) of one in-vehicle device. change. For this reason, it is suppressed that the 1st vehicle equipment picks up the noise of a 2nd vehicle equipment, and outputs it unnecessary.
Specifically, the second related to the second in-vehicle device provided with the oscillating means for oscillating the second frequency according to the first frequency related to the first in-vehicle device provided with the signal processing means for processing the signal having the first frequency. Actively change the frequency value.

More specifically, the transmission means of the first in-vehicle device transmits frequency information indicating the first frequency to the second in-vehicle device via the in-vehicle LAN.
The receiving means of the second in-vehicle device receives the frequency information from the first in-vehicle device via the in-vehicle LAN, and the determining means of the second in-vehicle device is either the second frequency or the harmonic frequency. It is determined whether or not it matches the frequency indicated by the received frequency information.

Here, when one of the second frequency and the harmonic frequency matches the first frequency, noise derived from the second vehicle-mounted device may adversely affect the first vehicle-mounted device.
For this reason, the change means of the 2nd vehicle equipment changes the 2nd frequency which an oscillation means oscillates to a different value, when it judges with a judgment means being in agreement.

  At this time, the value of the changed second frequency is a value in which the frequency of the changed value and the harmonic frequency of this frequency do not match the first frequency. That is, the changing unit changes the value of the second frequency so that each of the second frequency and the harmonic frequency is a frequency that is reliably separated from the first frequency.

As a result of the above, it is possible to reliably suppress the noise derived from the second vehicle-mounted device from adversely affecting the first vehicle-mounted device, and to suppress the interference of the second vehicle-mounted device to the first vehicle-mounted device due to the noise. be able to.
Further, the first in-vehicle device is not limited to the AM radio receiver, and the second in-vehicle device is not limited to the electric motor driving device.
Furthermore, even if there are various values of the first frequency, the second frequency is actively changed, so that the adverse effects of noise can be suppressed.

Now, when the determination means determines that each of the second frequency and the harmonic frequency does not match the first frequency, the changing means of the second in-vehicle device does not need to change the second frequency.
Further, the changing means may change the value of the second frequency to a predetermined frequency according to the first frequency, for example, and appropriately change the value of the second frequency and use the determining means for each change. The determination may be repeated.

  At least one first in-vehicle device and two second in-vehicle devices are connected to the in-vehicle LAN. However, one vehicle-mounted device may be configured to have one function of the first vehicle-mounted device or the second vehicle-mounted device, or may be configured to have both functions.

  The above-described in-vehicle device control system is configured at a low cost by connecting appropriate in-vehicle devices to an existing in-vehicle LAN and unilaterally communicating with each other or from the first in-vehicle device to the second in-vehicle device. Can be easily constructed.

The first vehicle-mounted device is a wireless communication device that receives or transmits / receives radio waves to / from the outside, such as a radio receiver and a television receiver.
The setting means of the first in-vehicle device is an operation unit including a knob, a switch and the like for the user of the first in-vehicle device to set the first frequency, for example, the first frequency is, for example, a radio broadcast station or a television broadcast This is a reception frequency assigned to a station or the like.

The wireless communication means that is the signal processing means of the first in-vehicle device uses a radio wave that is a signal having a first frequency set by the setting means, that is, a first frequency set by the user, as a radio broadcast station, a television broadcast station, or the like. Or wirelessly transmit to an external communication facility.
And the transmission means of the 1st vehicle equipment transmits the frequency information which shows the 1st frequency set by the setting means to 2nd vehicle equipment via in-vehicle LAN.
In addition, for example, the first in-vehicle device uses the radio wave received by the wireless communication unit to generate sound from the speaker, display an image on the display, and the like.

As described above, it is possible to reliably suppress the noise derived from the second vehicle-mounted device from adversely affecting the first vehicle-mounted device. For this reason, it is suppressed that the 1st vehicle equipment which is radio | wireless communication apparatuses, such as a radio receiver and a television receiver, receives noise.
As a result, it is possible to prevent the received noise from being output to the speaker, the display, or the like of the first in-vehicle device and making viewing difficult. In addition, it is possible to suppress wireless transmission of noise from the first in-vehicle device to an external communication facility.

  For example, a vehicle-mounted device whose clock frequency exceeds the reception frequency and is clearly not a noise generation source can change the clock frequency according to the reception frequency of the first vehicle-mounted device (second vehicle-mounted device). It is not necessary to have the function of the device. Or it is not necessary to transmit a receiving frequency from such a vehicle-mounted device from the first vehicle-mounted device.

It is a block diagram which shows the structure of the vehicle equipment control system which concerns on this invention. It is a flowchart which shows the procedure of the frequency change process which CPU of ECU as an in-vehicle apparatus concerning this invention performs.

Explanation of symbols

1 Radio receiver (first in-vehicle device)
10 CPU
12 I / F (Transmission means)
13 Operation part (setting means)
14 Radio section (signal processing means, wireless communication means)
2 EPS ECU (second in-vehicle equipment, in-vehicle equipment)
20 CPU
21 Clock generator (oscillating means, changing means)
22 I / F (Receiving means)
3 LAN in the car

Claims (3)

In an in-vehicle device control system comprising a plurality of in-vehicle devices connected to an in-vehicle LAN,
The first in-vehicle device
Signal processing means for processing a signal having a first frequency;
Transmission means for transmitting frequency information indicating the first frequency to the second in-vehicle device via the in-vehicle LAN,
The second in-vehicle device is
Oscillating means for oscillating the second frequency;
Receiving means for receiving frequency information from the first in-vehicle device via the in-vehicle LAN;
A determination unit that determines whether the frequency of the second frequency or the harmonic matches the frequency indicated by the frequency information received by the reception unit;
An in-vehicle device control system comprising: a changing unit that changes the second frequency oscillated by the oscillating unit to a different value so as not to match when it is determined that the determining unit matches. The first in-vehicle device is
Setting means for setting the first frequency;
The signal processing means includes
The in-vehicle device control system according to claim 1, wherein the vehicle-mounted device control system is a wireless communication unit that wirelessly communicates with the outside using a signal having the first frequency set by the setting unit. For in-vehicle devices connected to the in-vehicle LAN,
Oscillating means for oscillating a predetermined frequency;
Receiving means for receiving frequency information indicating a frequency from the outside via the in-vehicle LAN;
Determining means for determining whether the predetermined frequency or the harmonic frequency matches a frequency indicated by the frequency information received by the receiving means;
An in-vehicle device comprising: a changing unit that changes a frequency oscillated by the oscillating unit to a different value so as not to match when it is determined that the determining unit matches.

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