JP4501353B2 - Electronically controlled brake device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electronically controlled brake device, and more particularly to an electronically controlled brake device that performs vehicle brake control.
[0002]
[Prior art]
In recent years, electronic devices that control brake operating pressure based on electrical command values have been used to eliminate transmission delays in brake piping systems, improve vehicle stability by preventing braking force imbalance, and improve braking capability by distributing braking force suitability. Control brake devices have been developed.
[0003]
A conventional electronically controlled brake device includes a brake pedal sensor that detects a depression amount of a brake pedal, a calculation unit that calculates a control command value based on a brake pedal sensor signal input from the brake pedal sensor, And a brake actuator that controls the brake operating pressure of the vehicle based on a control command value input from the unit.
[0004]
In addition, electronically controlled brake devices for large vehicles have been developed that use air pressure to release the brakes. In this case, the air pressure is generated by a compressor driven by a vehicle engine and stored in a tank. When a brake operated by a spring force or the like is released in a closed circuit, the brake actuator However, the air pressure on the brake / cylinder side is consumed by opening to the atmosphere.
[0005]
On the other hand, as a side brake for large vehicles, the brakes are activated by activating the brakes by using spring force, etc. by consuming air pressure, and releasing the brakes by increasing the air pressure to overcome the spring force, etc. An electronically controlled brake system called the "sound" is also being developed.
[0006]
Normally, when brake control is performed using air pressure as described above, if the engine is started and the compressor is operating, the air pressure consumed when releasing or operating the brake is replenished.
On the other hand, as a means of preventing theft of vehicles, an immobilizer that prohibits engine fuel injection and prevents the engine from starting when an engine other than a registered key with a transponder is to be started Devices have become popular in recent years.
[0007]
A general immobilizer device, a transponder built-in key, and checking the registration information of the transponder to determine whether it is a regular key, and an immobilizer ECU that outputs a permission signal or a prohibition signal to the engine ECU, The engine ECU is configured to perform control based on a signal from the immobilizer ECU.
[0008]
As an example of such an immobilizer device, when the key means side key code does not match the vehicle side key code, or the unit code held in the engine start check unit, the unit code held in the engine control unit, and the control unit When there is a mismatch in any of the reference results with the held unit code, the vehicle engine control device has been improved in the anti-theft performance by shutting off the power supply to the engine control unit (see, for example, Patent Document 1). Has been proposed.
[0009]
There is also a vehicle antitheft device (see, for example, Patent Document 2) that can easily register an ID code for user identification.
Furthermore, there is also a vehicle antitheft device that does not require a dedicated tool for registration of a security code that is set separately to cancel the antitheft function in an emergency and for emergency input (see, for example, Patent Document 3). .
[0010]
[Patent Document 1]
JP-A-8-268229 (Summary, FIG. 1)
[0011]
[Patent Document 2]
JP-A-8-318819 (summary, FIG. 3)
[0012]
[Patent Document 2]
JP-A-8-324388 (summary, FIG. 4)
[0013]
[Problems to be solved by the invention]
In the above immobilizer device, anti-theft measures are taken only for the engine ECU, so if the engine ECU installed in the vehicle has the immobilizer function disabled in advance, it can be damaged by theft. Increases nature. In particular, in the case of a large vehicle, if it is stolen in a state where an article is loaded, it will suffer enormous damage.
[0014]
Further, in order to further strengthen the anti-theft measures, a cumbersome operation such as attaching an instrument that restrains steering of the steering wheel is required in combination with the immobilizer device.
If the electronically controlled brake device is interlocked with the above-described immobilizer device, it is possible to enhance theft prevention without requiring the troublesome operation as described above, but conventionally, the electronically controlled brake device interlocked with the above-described immobilizer device is There was no.
[0015]
Accordingly, an object of the present invention is to provide an electronically controlled brake device that is linked to an immobilizer device and that can prevent theft of a vehicle without impairing safety during traveling.
[0016]
[Means for Solving the Problems]
In order to achieve the above object, an electronically controlled brake device according to the present invention is activated by use of a key, determines whether or not a regular key is used, and generates a predetermined signal indicating the determination result. the immobilizer device to a state that can not start the engine, timed the specified time period from the detection of the start of the immobilizer device, the predetermined signal received from the immobilizer device within the predetermined time, the said authorized key Only when it indicates that it is not being used, a calculation unit that outputs a predetermined foot brake operating pressure as a brake control signal, and a brake actuator that generates a foot brake lock state based on the brake control signal, It is characterized by having prepared.
[0017]
That is, the immobilizer device determines whether or not a regular key has been used at the time of starting the engine, as in the prior art. For example, the permission signal indicating that the regular key has been used or the regular key has not been used. A prohibition signal indicating this is generated as a predetermined signal so that the engine cannot be started.
[0018]
Arithmetic unit performs counting of a predetermined time after detecting that the immobilizer device is activated by use of a key, the predetermined signal from the immobilizer device received within the predetermined time, the said authorized key Only when it indicates that it is not being used, a predetermined foot brake operating pressure is output as a brake control signal.
The brake / actuator performs foot brake lock control based on the brake control signal output from the calculator.
[0019]
Therefore, when there is a thief who tries to start the engine without using a regular key, not only can the engine not be started as in the conventional case, but also the brake is locked by the operation of the brake actuator, that is, the brake Will remain in operation, making it difficult to move or tow the vehicle in a short time and prevent theft of the vehicle.
[0020]
In addition, although the engine is started using the regular key, a predetermined signal indicating that the regular key is not being used is erroneously generated due to, for example, a malfunction of the immobilizer device during traveling. However, since the brake is not locked if a predetermined time has passed as a result of the time measurement by the calculation unit, the safety during traveling is not impaired.
[0021]
The electronically controlled brake device is activated by use of a key, determines whether or not a regular key has been used, and generates a predetermined signal indicating the determination result, thereby making it impossible to start the engine. and immobilizer device, counts a predetermined time from the detection of the start of the immobilizer device, the predetermined signal received from the immobilizer device within the predetermined time, it indicates that the authorized key is not being used when in only an arithmetic unit for outputting a predetermined intermittent foot brake operating pressure as a brake control signal, based on the brake control signal, and a brake actuator to repeat the operation and release of the foot brake to consume air pressure, May be provided.
[0022]
That is, the calculation unit may be the predetermined signal from the immobilizer device received from the detection that the immobilizer device is started within a predetermined time by the use of keys, the authorized key is not being used The predetermined intermittent foot brake operating pressure is output as a brake control signal only when
The brake actuator performs foot brake control based on the brake control signal output from the calculation unit, and performs control to consume air pressure.
[0023]
As a result, when the brake control signal is the predetermined intermittent brake operating pressure, the brake actuator repeatedly operates and releases the brake, and the air pressure is consumed every time the brake is released or operated. Is done.
Therefore, when there is a thief who tries to start the engine without using a regular key, not only can the engine not be started as in the prior art, but also the operation of the brake to prevent theft by the operation of the brake actuator. Since the release is repeated and the brake operates intermittently, it becomes difficult to move and tow the vehicle in a short time, and the vehicle can be prevented from being stolen.
[0024]
In addition, since a large amount of air pressure is consumed due to frequent repetition of brake operation and release, air pressure is often used for other vehicle control particularly in large vehicles. If it is used for the operation of the machine, the shifting operation cannot be performed. Furthermore, since the sound discharged when air pressure is consumed plays the role of a warning sound, the vehicle theft prevention effect is enhanced.
[0025]
Even if the engine is started using the regular key, a predetermined signal indicating that the regular key is not being used is generated due to, for example, a malfunction of the immobilizer device during traveling. If the predetermined time has elapsed as a result of the time measurement by the arithmetic unit, the brake operation and release are not repeated as described above, so that safety during traveling is not impaired.
[0026]
Further, the calculation unit may count the predetermined time using a built-in clock.
Alternatively, the immobilizer device transmits predetermined data or pulse signals to the arithmetic unit at a predetermined cycle after activation, and the arithmetic unit calculates the predetermined time based on the received number of the predetermined data or pulse signals. It may be timed.
[0027]
That is, since the number of the predetermined data or pulse signal transmitted to the arithmetic unit at a predetermined cycle after the immobilizer device is activated corresponds to time, the arithmetic unit receives the predetermined data or pulse signal received. The predetermined time is counted based on the number.
Further, whether or not the immobilizer device transmits data in a predetermined format to the arithmetic unit only in the predetermined time or only after the predetermined time has elapsed, and the arithmetic unit receives the data in the predetermined format. An electronically controlled brake device characterized by determining whether or not it is within the predetermined time.
[0028]
That is, the immobilizer device measures the predetermined time, and further transmits data in a predetermined format to the arithmetic unit at a predetermined cycle only within the predetermined time or only after the predetermined time has elapsed.
For example, when the immobilizer device transmits the data in the predetermined format only within the predetermined time, the arithmetic unit may determine that the data is within the predetermined time if the arithmetic unit receives the data in the predetermined format. Conversely, when the immobilizer transmits the data in the predetermined format only after the predetermined time has elapsed, the arithmetic unit may determine that it is within the predetermined time if the data in the predetermined format is received. .
[0029]
The predetermined signal may be a permission signal indicating that the regular key is used or a prohibition signal indicating that the regular key is not used.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the electronically controlled brake device according to the present invention includes an embodiment (1) for preventing the theft by locking the brake and an embodiment (2) for preventing the theft by repeatedly operating and releasing the brake. Separately described.
[0031]
Example (1) : FIGS. 1 and 2
FIG. 1 shows a configuration of an embodiment (1) of an electronically controlled brake device according to the present invention. This electronically controlled brake device includes an engine starting key 10 incorporating a transponder 11 and an antenna 21. The immobilizer ECU 20 includes an engine ECU 30, a brake pedal sensor 40, a calculation unit 50, and a brake actuator 60. The configuration shown in the figure is common to Example (2) described later.
[0032]
The key 10 stores data for collating with identification information stored in advance in the immobilizer ECU 20, and sends this data from the transponder 11 to the immobilizer ECU by radio waves or the like.
The immobilizer ECU 20 receives the data from the transponder 11 with the antenna 21 and collates the received data with the identification information stored in the immobilizer ECU 20, and only when they match, the engine is started with the regular key 10. Judgment is made and a permission signal is issued to the engine ECU 30 and the calculation unit 50.
[0033]
Note that the immobilizer ECU 20 may issue a prohibition signal when the received data does not match the identification information instead of the permission signal. However, in this embodiment (1), description will be made assuming that the immobilizer ECU 20 issues a permission signal.
[0034]
Furthermore, the immobilizer ECU 20 may generate a predetermined signal (predetermined data or pulse, data of a predetermined format, etc.) used by the calculation unit 50 described later for determining the anti-theft start condition separately from the permission signal. .
The engine ECU 30 executes engine control such as start-up control and fuel injection control on the engine (not shown) only when the permission signal from the immobilizer ECU 20 is input.
[0035]
The brake pedal sensor 40 may be a known sensor that is attached to a brake pedal (not shown) and that can detect the amount of depression.
The calculation unit 50 includes an input unit 51 that reads a signal from the immobilizer ECU 20 and a signal from the brake pedal sensor 40, a CPU 52 that performs calculation and determination related to electronically controlled brake control using the output signal of the input unit 51, and a calculation RAM53 used by CPU52, ROM54 that stores control programs and control parameters, output unit 55 that drives brake actuator 60 according to output data obtained by CPU52, and each part from the vehicle power supply And a power source unit 56 for supplying various power sources.
[0036]
The brake actuator 60 is attached to a vehicle piping system (not shown), generates a predetermined pressure from a pressure source (not shown) based on an output from the output unit 55, and generates a brake cylinder (not shown). A well-known device for discharging the liquid may be used.
[0037]
FIG. 2 shows the flow of the control program stored in the ROM 54 in the arithmetic unit 50 shown in FIG. 1.Hereinafter, the operation of the embodiment (1) of FIG. 1 will be described with reference to FIG. explain. Note that this flowchart is started at predetermined time intervals, and only the part related to the control of the control device is described, but initial processing at the time of starting up the hardware such as the CPU is omitted.
[0038]
First, the CPU 52 reads a signal from the immobilizer ECU 20 and a signal from the brake pedal sensor 40 via the input unit 51 (step S1).
Next, the CPU 52 checks whether or not a theft prevention start condition is satisfied (S2 in the same). Here, the anti-theft start condition may be a condition that is satisfied only after a predetermined time elapses after the processing by the calculation unit 50 is started and is not satisfied after the predetermined time elapses.
[0039]
If the anti-theft start condition is satisfied in step S2, it is determined whether there is a permission signal in the signal from the immobilizer ECU 20 read in step S1 (S3).
If it is determined in step S3 that a permission signal is present, a control command value for controlling the brake actuator 60 is obtained based on the brake pedal sensor signal read in step S1 (S4), and based on this control command value Then, the brake operation pressure control of the brake actuator 60 is performed (S5), and the process is terminated.
[0040]
If it is determined in step S3 that there is no permission signal, it means that the regular key 10 has not been used, and there is a suspicion of theft, so the anti-theft flag indicating that the anti-theft control is being performed in step S6. Is set to “ON” and the set value is substituted into the control command value for controlling the brake / actuator 60 (S7), and the brake operating pressure control of the brake / actuator 60 is performed based on this control command value (same as S5), the process ends.
[0041]
The anti-theft flag set to “ON” in step S6 is initialized to “OFF” when the hardware is activated.
Further, the set value substituted for the control command value in step S7 may be a value stored in the ROM 54 in advance.
[0042]
If the anti-theft start condition is not satisfied in step S2, the state of the anti-theft flag is confirmed (S8). Here, if the anti-theft flag is “ON”, it is already determined that there is a suspicion of the theft, so the process proceeds to step S6 as shown in FIG.
[0043]
If it is determined in step S8 that the anti-theft flag is “OFF”, the brake pedal / sensor signal read in step S1 is applied based on the brake pedal / sensor signal read in step S3. A control command value for controlling the actuator 60 is obtained (S4), the brake operating pressure control of the brake actuator 60 is performed based on this control command value (S5), and the process is terminated.
[0044]
Example (2) : FIGS. 1 and 3
The configuration of the embodiment (2) of the electronically controlled brake device according to the present invention is the same as that of the embodiment (1), and as shown in FIG. 1, the engine starting key 10 incorporating the transponder 11 and the antenna An immobilizer ECU 20 having 21, an engine ECU 30, a brake pedal sensor 40, a calculation unit 50, and a brake actuator 60 are configured.
[0045]
However, the brake / actuator 60 of the embodiment (2) may be a known device that is conventionally used in a large vehicle and that can operate or release the brake by consuming air pressure.
FIG. 3 shows the flow of the control program stored in the ROM 54 in the calculation unit 50 shown in FIG. 1 in the case of the embodiment (2) .Hereinafter, the embodiment (see FIG. The operation of 2) will be described. Like the flowchart of the embodiment (1) shown in FIG. 2, the flowchart of FIG. 3 is also started at a predetermined time interval, and only the part related to the control of the control device is described, but the CPU etc. Initial processing at the time of hardware startup is omitted.
[0046]
Also, the steps S11 to S18 of the embodiment (2) shown in FIG. 3 correspond to the steps S1 to S8 of the embodiment (1) shown in FIG.
First, the CPU 52 reads a signal from the immobilizer ECU 20 and a signal from the brake pedal sensor 40 via the input unit 51 (step S11).
[0047]
Next, the CPU 52 confirms whether or not the anti-theft start condition is satisfied (S12). Here, the anti-theft start condition may be a condition that is satisfied only after a predetermined time elapses after the processing by the calculation unit 50 is started and is not satisfied after the predetermined time elapses.
If the anti-theft start condition is satisfied in step S12, it is determined whether there is a permission signal in the signal from the immobilizer ECU 20 read in step S11 (S13).
[0048]
If it is determined in step S13 that a permission signal is present, a control command value for controlling the brake actuator 60 is obtained based on the brake pedal sensor signal read in step S11 (S14), and based on this control command value Then, the brake operating pressure control of the brake actuator 60 is performed (S15 in the same), and the processing is terminated.
[0049]
If it is determined in step S13 that there is no permission signal, it means that the regular key 10 has not been used, and there is a suspicion of theft. Set the flag to “ON”, substitute the set value for the control command value for controlling the brake / actuator 60 (S17), and control the brake operating pressure of the brake / actuator 60 based on this control command value ( At step S15), the process ends.
[0050]
The anti-theft flag set to “ON” in step S16 is initialized to “OFF” when the hardware is activated.
Further, the set value substituted for the control command value in step S17 is a value corresponding to a predetermined intermittent brake operating pressure, which is calculated based on the parameters stored in the ROM 54 in advance. It changes with time as shown in the graph.
[0051]
Therefore, as long as the anti-theft flag is “ON”, the brake operation pressure control of the brake actuator 60 in step S15 repeats the operation and release of the brake, and a large amount of air pressure is consumed.
If the anti-theft start condition is not satisfied in step S12, the state of the anti-theft flag is confirmed (S18). Here, if the anti-theft flag is “ON”, it is already determined that there is a suspicion of the theft, so the process proceeds to step S16 as shown in (2) in FIG.
[0052]
If it is determined in step S18 that the anti-theft flag is “OFF”, the brake pedal / sensor signal read in step S11 is applied based on the brake pedal sensor signal read in step S13, as in the case where it is determined in step S13 that the permission signal is present. A control command value for controlling the actuator 60 is obtained (S14), the brake operating pressure control of the brake actuator 60 is performed based on this control command value (S15), and the process is terminated.
[0053]
The anti-theft start condition that is determined in steps S2 and S12 in the above embodiments (1) and (2) is satisfied only until a predetermined time elapses after the start of processing by the calculation unit 50 , and the predetermined time elapses. Since it is sufficient that the condition is not satisfied later, for example, the predetermined time may be measured by the following method.
[0054]
(1) The arithmetic unit 50 measures a predetermined time using a built-in clock (not shown).
(2) After starting, the immobilizer ECU 20 transmits predetermined data or pulse signals to the arithmetic unit 50 in a predetermined cycle separately from the above permission signal, and the arithmetic unit 50 receives the number of predetermined data or pulse signals received. The predetermined time is counted based on the above.
[0055]
(3) After the immobilizer ECU 20 is activated, data in a predetermined format (for example, data in the format of “11”) is stored in the arithmetic unit 50 only in a predetermined time or only after a predetermined time, apart from the above permission signal. The calculation unit 50 determines whether it is within a predetermined time depending on whether data in a predetermined format is received.
[0056]
In this case, if the data format sent by the immobilizer ECU 20 is changed within the predetermined time and after the predetermined time has elapsed, it is possible to determine whether or not a failure has occurred in the connection between the immobilizer ECU and the calculation unit 50. I can do it.
For example, if data in a predetermined format to be transmitted within a predetermined time is changed to “11” format data, and the format of the data to be transmitted after the predetermined time has elapsed is “≠ 11”, any format data cannot be received. In such a case, since it can be determined that the connection is faulty, the possibility of malfunctioning can be reduced.
[0057]
【The invention's effect】
As described above, according to the electronically controlled brake device according to the present invention, a predetermined signal from the immobilizer device is detected within a predetermined time after the arithmetic unit detects that the immobilizer device is activated by using the key . Only when it indicates that the regular key is not being used, a predetermined foot brake operating pressure or a predetermined intermittent foot brake operating pressure is output as a brake control signal, and based on the brake control signal, the brake actuator An immobilizer device that can prevent theft of the vehicle without compromising safety while driving, because it is configured to perform foot brake lock control or repeated control of foot brake activation or release with air consumption. An interlocked electronically controlled brake device can be provided.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of embodiments (1) and (2) of an electronically controlled brake device according to the present invention.
FIG. 2 is a flowchart showing a control program used in the embodiment (1) of the electronically controlled brake device according to the present invention.
FIG. 3 is a flowchart showing a control program used in the embodiment (2) of the electronically controlled brake device according to the present invention.
[Explanation of symbols]
10 key
11 Transponder
20 Immobilizer ECU
21 Antenna
30 engine ECU
40 Brake pedal sensor
50 Calculation unit
60 In the brake / actuator diagrams, the same reference numerals indicate the same or corresponding parts.

Claims (6)

An immobilizer device that is activated by the use of a key, determines whether or not a regular key has been used, generates a predetermined signal indicating the determination result, and disables the engine;
Counts a predetermined time from the detection of the start of the immobilizer device, the predetermined signal received from the immobilizer device within the predetermined time, only when the authorized key indicates that it has not been used, A calculation unit that outputs a predetermined foot brake operating pressure as a brake control signal;
A brake actuator that generates a locked state of the foot brake based on the brake control signal;
An electronically controlled brake device comprising: An immobilizer device that is activated by the use of a key, determines whether or not a regular key has been used, generates a predetermined signal indicating the determination result, and disables the engine;
Counts a predetermined time from the detection of the start of the immobilizer device, the predetermined signal received from the immobilizer device within the predetermined time, only when the authorized key indicates that it has not been used, A calculation unit that outputs a predetermined intermittent foot brake operating pressure as a brake control signal;
Based on the brake control signal, a brake actuator that repeats the operation and release of the foot brake to consume air pressure;
An electronically controlled brake device comprising: In claim 1 or 2,
The electronic control brake device, wherein the arithmetic unit measures the predetermined time using a built-in clock. In claim 1 or 2,
The immobilizer device transmits predetermined data or pulse signals to the arithmetic unit at a predetermined cycle after activation, and the arithmetic unit counts the predetermined time based on the received number of the predetermined data or pulse signals. An electronically controlled brake device. In claim 1 or 2,
The immobilizer device transmits data in a predetermined format only within the predetermined time or only after the predetermined time has elapsed to the arithmetic unit at a predetermined cycle, and the arithmetic unit determines whether the data in the predetermined format has been received. An electronically controlled brake device characterized by determining whether or not it is within a predetermined time. In claim 1,
The electronic control brake device, wherein the predetermined signal is a permission signal indicating that the regular key is used or a prohibition signal indicating that the regular key is not used.

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