JP2006244116A - Vehicular output monitoring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular output monitoring device that can monitor periodic fluctuations in output signals of a vehicular electronic control device. <P>SOLUTION: About an output signal output by the vehicular electronic control device to control an electronically controlled actuator, a change frequency Nsw of changes in the output signal is stored, the change frequency Nsw per unit time is compared with a reference change frequency Ksw such that periodic fluctuations in the output signal can be detected as an abnormality, and if an abnormality is detected, changes in the output signal are prohibited. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle output monitoring device that monitors an abnormality of an output signal that is output by a vehicle electronic control device to control an electronic control actuator, a display, or the like.

  Conventionally, Patent Document 1 discloses the following technique as a technique for monitoring an output signal output from a vehicle electronic control device to control an electronic control actuator.

  In this conventional technology, in an electronic control device including a microcomputer (hereinafter referred to as a microcomputer) and a peripheral integrated circuit, the microcomputer and the peripheral integrated circuit perform data communication, and the control state of the microcomputer and the output state of the peripheral integrated circuit are compared. By doing so, it is possible to monitor the abnormality of the output signal.

  Here, the microcomputer in this prior art means a function for determining whether or not to perform control based on an input signal obtained from detection means such as a sensor, and controls an electronic control actuator or the like based on the control state. A function for calculating an output signal to be output, a function for instructing the peripheral integrated circuit to output the output signal, and the like. The peripheral integrated circuit is a function for converting a detection signal output by a detection means such as a sensor into an input signal for a microcomputer and outputting an output signal for controlling an electronic control actuator or the like based on a command from the microcomputer. It has a function, a function of storing the control state of the microcomputer, and the like.

  Furthermore, this prior art shows an application to a system (hereinafter referred to as ABS) that controls the tire not to be locked when the vehicle is braked.

  For example, when the microcomputer enters the control state in which the ABS control is performed based on the input signal obtained from the detection unit, the fact that the microcomputer performs the ABS control is transmitted to the peripheral integrated circuit by serial communication.

  By the way, in order to perform ABS control, it is necessary to drive an actuator that increases or decreases the brake fluid pressure, so the microcomputer instructs the peripheral integrated circuit to output an output signal that drives the actuator. Must.

Therefore, if the microcomputer does not instruct the peripheral integrated circuit to output an output signal even after a predetermined time has elapsed since the peripheral integrated circuit stores the control state that the microcomputer performs ABS control, the peripheral integrated circuit Outputs a signal to the microcomputer that the calculation result of the microcomputer is abnormal. With this signal, the microcomputer can monitor the abnormality of the output signal to the electronic control actuator.
Japanese Patent Laid-Open No. 2001-312315

  However, in the above prior art, if the microcomputer instructs the peripheral integrated circuit to output an output signal before the predetermined time elapses after the peripheral integrated circuit stores the control state of the microcomputer, the output signal is No matter how many times the change is made, the peripheral integrated circuit does not output a signal that the microcomputer operation result is abnormal. For this reason, there is a problem in that this periodic variation cannot be detected even if the output signal has an abnormality that periodically varies.

  For example, even if the input signal obtained from the detecting means periodically varies due to poor contact of the electrical wiring due to vehicle vibration, etc., the output signal based on the calculation result of the microcomputer also varies abnormally. If the microcomputer instructs the peripheral integrated circuit to output the output signal before the predetermined time elapses, the microcomputer cannot detect the abnormality of the output signal.

  For this reason, the operation of the actuator also periodically changes. For example, when the actuator is a motor, the deterioration of the motor is promoted by the periodic fluctuation of the rotation speed, and the passenger feels uncomfortable by the change of the operating sound. This causes problems such as

  An object of the present invention is to provide a vehicle output monitoring device capable of monitoring periodic fluctuations in an output signal.

  In order to achieve the above object, according to the first aspect of the present invention, there is provided a vehicle output monitoring device for monitoring an output signal of the vehicle electronic control device (25), wherein the output signal is determined to be changed. 1 determination means (S202), storage means (26) for storing the number of changes (Nsw) determined per unit time by the first determination means (S202), and the number of changes (Nsw) Second determination means (S205) for determining an abnormality of the output signal when it is equal to or higher than (Ksw).

  According to this, since the number of changes (Nsw) at which the output signal is changed per unit time is stored and can be compared with the reference change number (Ksw), periodic fluctuations in the output signal can be monitored. .

  According to a second aspect of the present invention, in the vehicle output monitoring apparatus according to the first aspect, the output signal is an electric signal composed of two voltage levels, a high level voltage and a low level voltage, The 1 determination means (S202) is characterized in that a change in voltage level is determined as a change in output signal.

  According to this, since the output signal is an electric signal composed of two levels of a high level voltage and a low level voltage, it is possible to easily detect a change in the output signal and to monitor periodic fluctuations in the output signal. It's easy to do.

  As in the third aspect of the invention, in the vehicle output monitoring apparatus according to the first aspect, the output signal is an electric signal composed of a combination of two levels of a high level voltage and a low level voltage. An electric signal in which one high-level voltage and one low-level voltage form a rectangular wave having a fixed period, and the first determination means (S202) occupies the high-level voltage in the fixed period. Even if it is determined that a change in at least one of the time ratio or the time ratio occupied by the low-level voltage is a change in the output signal, the change in the output signal can be easily detected.

  Here, as shown in FIG. 5, one high level voltage and one low level voltage constituting a rectangular wave having a fixed period occupy one high level voltage. An electric signal is shown in which the time Th and the time Tl occupied by one low level voltage are summed in this order to always give a fixed time T. On the contrary, an electric signal that always takes a certain time T when the time Tl occupied by one low level voltage and the time Th occupied by one high level voltage are summed in this order is also included.

  As in the invention according to claim 4, in the vehicle output monitoring apparatus according to claim 1, the output signal is an electric signal composed of a combination of two levels of high level voltage and low level voltage. In addition, the first determination means (S202) changes the digital data by changing the digital data by combining a plurality of high level voltages and low level voltages in time series to form digital data. Can be easily detected as a change in the output signal.

  Here, the digital data described in claim 4 is data represented by a finite digit number such as a binary number. In addition, as shown in FIG. 6, an electrical signal that constitutes digital data by combining a plurality of high-level voltages and a plurality of low-level voltages in time series is digital data consisting of differences in voltage levels at each time Ts. Is included.

  According to a fifth aspect of the present invention, in the vehicle output monitoring device according to any one of the first to fourth aspects, the vehicle electronic control device includes an air conditioning actuator (5, 9, 12, 19, 21 and 23) and an air conditioning electronic control device (25) that outputs an output signal for controlling at least one of the air conditioning indicator (38).

  In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic diagram of the overall configuration of a vehicle air conditioner. The indoor unit of the vehicle air conditioner is roughly divided into a blower unit 1 and an air conditioner unit 2. The blower unit 1 includes an inside / outside air switching box 3 and a blower 4. The inside / outside air switching door 5 in the inside / outside air switching box 3 opens and closes the outside air introduction port 6 and the inside air introduction port 7. Thereby, outside air (vehicle compartment outside air) or inside air (vehicle compartment air) is switched and introduced into the inside / outside air switching box 3. The inside / outside air switching door 5 is driven by an electric drive device 8 comprising a servo motor. The blower 4 is provided with a centrifugal blower fan 9 and a drive motor 10.

  The air conditioning unit 2 is provided with an air conditioning case 2a that forms an air passage, and an evaporator (cooling heat exchange means) 11 of the refrigeration cycle is disposed upstream of the air flow in the air conditioning case 2a. An air mix door 12 is disposed on the downstream side. On the downstream side of the air mix door 12, a hot water heater core (heating heat exchanging means) 13 that heats the air using hot water (cooling water) of the vehicle engine as a heat source is installed. A bypass passage 14 that bypasses the hot water heater core 13 and flows air is formed on the side of the hot water heater core 13 (the vehicle upper portion).

  The air mix door 12 is a rotatable plate-like door and is driven by an electric drive device 15 including a servo motor. The air mix door 12 adjusts the air volume ratio between the hot air passing through the hot water heater core 13 and the cool air passing through the bypass passage 14, and the air blown into the vehicle interior by adjusting the air volume ratio of the cold / hot air. Adjust the temperature.

  A hot air passage 16 extending upward from the lower side of the vehicle is formed on the downstream side of the hot water heater core 13. The hot air from the hot air passage 16 and the cold air from the bypass passage 14 are mixed by the air mixing unit 17. Air at the desired temperature can be created.

  Further, an air outlet mode switching unit is configured on the downstream side of the air mixing unit 17 in the air conditioning case 2a. That is, a defroster opening 18 is formed on the upper surface of the air conditioning case 2a, and this defroster opening 18 blows air to the inner surface of the vehicle windshield through a defroster duct (not shown). The defroster opening 18 is opened and closed by a rotatable plate-like defroster door 19.

  In addition, a face opening 20 is formed on the upper surface of the air-conditioning case 2a at the rear side of the vehicle from the defroster opening 18, and the face opening 20 is directed toward the upper body of the passenger in the vehicle cabin via a face duct (not shown). It blows out air. The face opening 20 is opened and closed by a rotatable plate-like face door 21.

  Further, in the air conditioning case 2a, a foot opening 22 is formed in a lower part of the face opening 20, and air is blown out from the foot opening 22 toward the feet of passengers in the passenger compartment. The foot opening 22 is opened and closed by a rotatable plate-like foot door 23.

  The blow-out mode doors 19, 21, and 23 are connected to a common link mechanism (not shown), and are driven by an electric drive unit 24 including a servo motor via the link mechanism.

  Next, the outline of the electric control unit in the present embodiment will be described. The air conditioning electronic control device 25 and the output monitoring device 26 are configured by a well-known microcomputer including a CPU, a ROM, a RAM, and the like, and a peripheral integrated circuit. It is.

  The air-conditioning electronic control unit 25 has a well-known temperature sensor 27 for detecting an evaporator blowing temperature Te, an inside air temperature Tr, an outside air temperature Tam, and a hot water temperature Tw at a portion immediately after the air blowing of the evaporator 11 for air conditioning control. , 28, 29, 30 and a solar radiation sensor 31 for detecting the solar radiation amount Ts and the like are input.

  The air conditioning control panel 32 installed near the vehicle interior instrument panel is provided with operation switches 33 to 37 that are manually operated by passengers, and operation signals of the operation switches 33 to 37 are also input to the electronic controller 25 for air conditioning. The

  Specifically, as the operation switch, an air volume switch 33 that generates an air volume switching signal, an air outlet mode switch 34 that generates an air blowing mode signal, an inside / outside air switching switch 35 that generates an inside / outside air switching signal, and a compressor ( An air conditioner switch 36 that intermittently operates (not shown), a temperature setting switch 37 that generates a temperature setting signal Tset, and the like are provided.

  Further, the air conditioning control panel 32 is provided with a display unit 38 for displaying the air temperature state such as the internal temperature Tr, the opening / closing states of the blowing mode doors 19, 21, and 23, and the amount of blowing air.

  The air conditioning electronic control device 25 outputs signals for controlling various actuators such as the inside / outside air switching door 5, the centrifugal blower fan 9, the air mix door 12, and the blowing mode doors 19, 21, and 23, the display unit 38, and the like. Is output. These output signals are output via the output monitoring device 26 to the electric drive device 8 that drives various actuators, the drive motor 10, the electric drive device 15, the electric drive device 24, the air conditioning control panel 32, and the like.

  The operation of the present embodiment will be described with the above configuration. The flowchart of FIG. 2 shows an outline of the control processing executed by the microcomputer of the air conditioning electronic control device 25. The control routine of FIG. 2 is a power supply to the air conditioning electronic control device 25 when an ignition switch of a vehicle engine (not shown) is turned on. Starts when is supplied.

  First, the outline of the control processing of the electronic control device 25 will be described. In step S1, flags, timers, etc. are initialized, and in the next step S2, operation signals of the operation switches 33 to 37 of the air conditioning control panel 32 are read. In the next step S3, a vehicle environmental state signal, that is, a detection signal from the sensors 27 to 31 is read.

  Subsequently, in step S4, a target blowing temperature TAO of the conditioned air blown into the vehicle interior is calculated. This target blowing temperature TAO is a blowing temperature necessary for maintaining the passenger compartment at the set temperature Tset of the temperature setting switch 37, and is calculated based on the following formula F1.

TAO = Kset × Tset−Kr × Tr−Kam × Tam−Ks × Ts + C (F1)
Here, Tr is the inside air temperature detected by the inside air sensor 28, Tam is the outside air temperature detected by the outside air sensor 29, Ts is the amount of solar radiation detected by the solar radiation sensor 31, and Kset, Kr, Kam, Ks are the control gain and C is a constant for correction.

  Next, the target air volume of the air blown by the blower 4 is determined in step S5. Specifically, the blower voltage level applied to the blower driving motor 10 is determined based on the TAO with reference to a control map stored in advance in the air conditioning electronic control device 25.

  Next, in step S6, the inside / outside air mode is determined. In this inside / outside air mode, for example, the inside air mode is set when the inside temperature Tr is significantly higher than the set temperature Tset by a predetermined temperature or higher (during cooling high load), and the outside air mode is set at other times. Alternatively, as the TAO rises from the low temperature side to the high temperature side, the setting may be switched from the all-inside air mode → the inside / outside air mixing mode → the all outside air mode.

  Next, in step S7, the blowing mode is determined according to the TAO. As is well known, the blowing mode is switched from face mode to bi-level mode to foot mode as TAO rises from the low temperature side to the high temperature side.

  Next, in step S8, the target opening degree SW of the air mix door 12 is calculated by the following formula F2 based on the TAO, the evaporator outlet temperature Te, and the hot water temperature Tw.

SW = [(TAO−Te) / (Tw−Te)] × 100 (%) (F2)
Here, the target opening degree SW of the air mix door 12 sets the maximum cooling position of the air mix door 12 (solid line position in FIG. 1) to 0%, and the maximum heating position of the air mix door 12 (dotted line position in FIG. 1). Is expressed as a percentage with 100%.

  Next, in step S9, data for displaying the air conditioning state on the display unit 38 is determined. Specifically, the data is based on the internal air temperature Tr, the blower voltage level determined in step S5, the blowing mode determined in step S7, and the like.

  Next, the process proceeds to step S10, and output signals to the drive devices (8, 10, 15, 24) of the various actuators are output from the output monitoring device 26 so that the control states determined in steps S5 to S9 are obtained. Is output via. In the next step S11, the process waits for the control period τ, and returns to step S2 when it is determined that the control period τ has elapsed.

  Next, the outline of the control process of the output monitoring device 26 will be described. The output monitoring device 26 is also supplied with power similarly to the electronic control device 25, and a control routine as shown in the flowchart of FIG. 3 is started.

  First, in step S101, flags, timers, and the like are initialized, and in the next step S102, an output signal output from the air conditioning electronic control device 25 is read.

  Next, in step S103, air mix door state determination (N1) is performed. That is, it is determined whether or not the output signal to the electric drive device 15 that drives the air mix door 12 is periodically fluctuating. A specific process of this state determination will be described with reference to FIG.

  First, in step S201, signals and information necessary for performing the state determination (N1) are read. Specifically, the number of changes Nsw (N1), measurement time Ntm (N1), reference number of changes Ksw (N1), reference unit time Ktm (N1), and output prohibition flag ONG (N1) stored in the output monitoring device 26 ) Etc. are read.

  The number of changes Nsw (N1) records the number of times the output signal has been changed, and the measurement time Ntm (N1) is based on a timer built in the output monitoring device 26 and measures the number of changes to the output signal so far. Remembered time. The reference change count Ksw (N1) stores a predetermined number of times for monitoring the periodic fluctuation of the output signal, and the reference unit time Ktm (N1) for monitoring the periodic fluctuation of the output signal. A predetermined unit time is stored. The output prohibition flag ONG (N1) is a flag for storing whether or not the output signal can be changed.

  Information on the number of times of change Nsw (N1), the measurement time Ntm (N1), the number of times of reference change Ksw (N1), the reference unit time Ktm (N1), and the output prohibition flag ONG (N1) are output signals output to the electric drive unit 15 Is stored in the output monitoring device 26, and N1 in parentheses is an identification symbol indicating that the state of the air mix door is determined.

  Next, in step S202, it is determined whether or not the output signal output from the air conditioning electronic control device 25 has been changed. Here, the change of the output signal in the state determination (N1) of the air mix door will be specifically described.

  The electric drive device 15 is fixed to the outer wall surface of the air conditioning case 2a, and includes a direct current motor, a speed reducer that decelerates the rotation of the direct current motor, an output gear that outputs the rotation of the speed reducer to the air mix door 12, and And a potentiometer that detects the rotation angle of the output gear.

  The air conditioning electronic control device 25 grasps the actual opening degree SWr of the air mix door 12 with a potentiometer, and uses the direct current motor until the target opening degree SW calculated in step S8 of FIG. 2 becomes equal to the actual opening degree SWr. A voltage of 12V is applied. When the target opening degree SW and the actual opening degree SWr are equal, 0V is applied to the DC motor.

  Therefore, in step S202, a change in the voltage applied to the DC motor becomes a change in the output signal. For example, when the voltage applied to the DC motor is changed from 12V → 0V or 0V → 12V, it is determined that the output signal has been changed.

  If the output signal has been changed in step S202, the process proceeds to step S203, 1 is added to the number of changes Nsw (N1), and the process proceeds to step S204. If there is no output signal change in step S202, the process proceeds to step S204.

  Next, in step S204, it is determined whether or not the measurement time Ntm (N1) is equal to or longer than a reference unit time Ktm (N1) that is a unit time. If the measurement time Ntm (N1) ≧ reference unit time Ktm (N1), the process proceeds to step S205. If the measurement time Ntm (N1) ≧ the reference unit time Ktm (N1), the process proceeds to step S208.

  In step S205, it is determined whether the number of changes Nsw (N1) per unit time is equal to or greater than the reference number of changes Ksw (N1). That is, it is determined whether or not the output signal has a periodic fluctuation. If the number of changes Nsw (N1) ≧ the number of reference changes Ksw (N1), 1 is input to the output prohibition flag ONG (N1) in step S206, and the process proceeds to step S207. If the number of changes Nsw (N1) ≧ reference number of changes Ksw (N1) is not satisfied in step S205, the process proceeds to step S207.

  According to the study by the present inventors, it is generally known that the opening degree of the air mix door 12 of the vehicle air conditioner is changed only once every 30 sec. Therefore, in this embodiment, the reference unit time Ktm (N1) is set to 300 (sec), and the reference change count Ksw (N1) is set to 100 (times).

  In this state determination (N1), since the DC motor operation start and stop are added to the change count Nsw (N1) in response to a change in the opening degree of the air mix door 12 once, generally in 300 sec. The output signal is changed about 20 times. Therefore, when the output signal is changed 100 times or more in 300 sec, it is determined that the output signal is periodically fluctuating.

  Next, in step S207, the measurement time Ntm (N1) and the number of changes Nsw (N1) are reset. Specifically, Ntm (N1) = 0 (sec) and Nsw (N1) = 0 (times). As a result, preparation for determination of the number of changes Nsw (N1) per unit time is made.

  Next, in step S208, the output monitoring device 26 stores the number of changes Nsw (N1), and the state determination ends.

  Next, in step S104, unless the output prohibition flag ONG (N1) = 1, the process proceeds to step S105, and the output signal to the electric drive device 15 is changed to the output signal read in step S102. If the output prohibition flag ONG (N1) = 1 in step S104, the process proceeds to step S106, and the change of the output signal to the electric drive device 15 is prohibited. That is, the output signal currently output to the electric drive device 15 is maintained.

  In this way, the state determination that the change of the output signal is the change of the voltage level is performed by the inside / outside air switching door 5 that opens and closes the door with the same structure as the air mix door 12 and the blowing mode doors 19, 21, and 23. Applicable to state determination.

  Next, a blower motor state determination (N2) is performed in step S106. That is, it is determined whether or not the output signal to the driving motor 10 that drives the centrifugal blower fan 9 periodically varies. This state determination (N2) is also performed as shown in the flowchart of FIG. 4 in the same manner as the air mix door state determination (N1). Note that N2 in the parentheses of the state determination is an identification symbol indicating the state determination of the blower motor.

  The rotational speed of the drive motor 10 is controlled by the blower voltage level described above, and the blower voltage level is changed by a method of changing the average voltage of the rectangular pulse voltage by a pulse width modulation (PWM) method. That is, as shown in FIG. 5, one high level voltage and one low level voltage constitute an electric signal constituting a rectangular wave with a constant period T, and the time Th occupied by the high level voltage occupies the period T. By changing the ratio, the average voltage is changed.

  For this reason, in step S202 of the blower motor state determination (N2), a change in the ratio of the period Th occupied by the high-level voltage of the rectangular wave output to the drive motor 10 to the period T is a change in the output signal. For example, when Th is changed from 10% to 50% with respect to T, it is determined that there is an output signal change.

  According to the study by the present inventors, it is known that the rotation of the centrifugal blower fan 9 of the vehicle air conditioner is generally changed only once every 30 seconds. Therefore, in this embodiment, the reference unit time Ktm (N2) is set to 30 (sec) and the reference change count Ksw (N2) is set to 5 (times) to monitor the periodic variation of the output signal. If it is determined that there is a periodic fluctuation, 1 is input to the output prohibition flag ONG (N2).

  Next, in step S107, unless the output prohibition flag ONG (N2) = 1, the process proceeds to step S108, and the output signal to the electric drive device 8 is changed to the output signal read in step S102. If the output prohibition flag ONG (N2) = 1 in step S107, the process proceeds to step S109, so that the change of the output signal to the drive motor 10 is prohibited and the output signal currently output to the drive motor 10 is maintained. Is done.

  Further, the drive motor 10 may supply drive power from the air conditioning electronic control device 25 via a relay. In this case, since the change of the output signal is a change of the voltage level output to the relay, it is possible to perform the same state determination as that of the air mix door 12 described above.

  Next, in step S109, output state determination (N3) to the display unit is performed. That is, it is determined whether or not the output signal output to the air conditioning control panel 32 in order to display the air conditioning state on the display unit 38 is periodically changing. Note that N3 in the parentheses of the state determination is an identification symbol indicating the state determination of the output to the display unit.

  The air conditioning control panel 32 receives data to be displayed on the display unit 38 through serial communication with the air conditioning electronic control device 25. As shown in FIG. 6, the data includes a plurality of high level voltages and a plurality of low level voltages based on a predetermined communication protocol for communication between the air conditioning electronic control device 25 and the air conditioning control panel 32. Is digital data configured by combining chronologically.

  For this reason, in step S202 of the state determination (N3) of the output to the display part 38, the change of the digital data output to the air-conditioning control panel 32 becomes a change of an output signal.

  Further, according to the study by the present inventors, it is known that the display on the display unit 38 is changed only once every 30 seconds, so the reference unit time Ktm (N3) is set to 30 (sec) and the reference is changed. The number of times Ksw (N3) is set to 5 (times), and the periodic variation of the output signal is monitored.

  Similarly, the inside / outside air mode state determination (N4), that is, whether or not the output signal to the electric drive device 8 that drives the inside / outside air switching door 5 periodically varies, and the state of the blowout door mode. Determination (N5), that is, whether or not the output signal to the electric drive device 24 that drives the blowout door modes 19, 21, and 23 periodically varies is performed, and the process returns to step S102.

  As described above, the output monitoring device 26 detects the periodic fluctuation of the output signal as an abnormality, and prohibits the change of the output signal after the abnormality is detected.

(Second Embodiment)
In the first embodiment, the output monitoring device 26 is configured separately from the air conditioning electronic control device 25 and electrically connected in series in the order of the air conditioning electronic control device 25 → the output monitoring device 26 → various actuators. However, it is also possible to connect the output monitoring device 26 and various actuators to the air conditioning electronic control device 25 in parallel as shown in FIG.

  In this case, the output monitoring device 26 cannot prohibit the change of the output signal directly, but the air conditioning electronic control device 25 monitors the output prohibition flag ONG of the output monitoring device 26 to prohibit the change of the output signal. can do.

(Third embodiment)
In the first embodiment and the second embodiment, the output monitoring device 26 is configured separately from the air conditioning electronic control device 25, but the output monitoring device 26 is integrated with the air conditioning electronic control device 25 as shown in FIG. It is also possible to configure.

  In this case, the same effect as in the first embodiment can be obtained by causing the microcomputer of the air conditioning electronic control device 25 to execute the control routine of the output monitoring device 26. Specifically, the control routine of the output monitoring device 26 is executed immediately after step S10 in FIG.

(Other embodiments)
In the first embodiment, when 1 is input to the output prohibition flag ONG, the subsequent change of the output signal is prohibited. However, the change of the output signal is prohibited simultaneously with the prohibition of the change of the output signal. The warning light may be turned on or blinking, or a warning sound may be emitted by a buzzer to allow the occupant to recognize that an abnormality has occurred due to periodic fluctuations in the output signal of the air conditioning electronic control device 25. .

1 is an overall configuration diagram of a first embodiment of the present invention. It is a flowchart which shows control of the electronic controller for an air conditioning of 1st Embodiment. It is a flowchart which shows control of the output monitoring apparatus of 1st Embodiment. It is a flowchart which shows the principal part of control of the output monitoring apparatus of 1st Embodiment. It is a time chart explaining the rectangular wave of a fixed period of 1st Embodiment. It is a time chart explaining the digital data of 1st Embodiment. It is a schematic whole block diagram of 2nd Embodiment. It is a schematic whole block diagram of 3rd Embodiment.

Explanation of symbols

5 ... Inside / outside air switching door, 9 ... Centrifugal blower fan, 12 ... Air mix door,
19, 21, 23 ... Blow mode door, 25 ... Electronic control device for air conditioning, 26 ... Output monitoring device,
38 ... Display section.

Claims (5)

A vehicle output monitoring device for monitoring an output signal of the vehicle electronic control device (25),
First determination means (S202) for determining that the output signal has been changed;
Storage means (26) for storing the number of changes (Nsw) determined per unit time by the first determination means (S202);
A vehicle output monitoring apparatus comprising: a second determination unit (S205) that determines an abnormality of the output signal when the number of changes (Nsw) is equal to or greater than a reference number of changes (Ksw). The output signal is an electric signal composed of two voltage levels, a high level voltage and a low level voltage,
The vehicle output monitoring apparatus according to claim 1, wherein the first determination unit (S202) determines that the change in the voltage level is a change in the output signal. The output signal is an electrical signal composed of a combination of two levels of a high level voltage and a low level voltage, and one high level voltage and one low level voltage is a rectangular wave with a fixed period. Comprising an electrical signal comprising:
The first determination unit (S202) determines that a change in at least one of a ratio of time occupied by the high level voltage or a ratio of time occupied by the low level voltage in the fixed period is a change of the output signal. The vehicle output monitoring apparatus according to claim 1. The output signal is an electrical signal composed of a combination of two levels of a high level voltage and a low level voltage, and digital data is obtained by combining a plurality of high level voltages and low level voltages in time series. An electrical signal comprising
The vehicle output monitoring apparatus according to claim 1, wherein the first determination unit (S202) determines that the change of the digital data is a change of the output signal. The vehicle electronic control device outputs an output signal for controlling at least one of an air conditioning actuator (5, 9, 12, 19, 21, 23) and an air conditioning display (38). 5. The vehicle output monitoring device according to claim 1, wherein the vehicle output monitoring device is a device (25).

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