Switch system

Abstract

In view of the foregoing background, it is therefore an object of the present disclosure to provide a switch system that can operate properly after a switch is released from an ON-fixed state.SOLUTION: In a switch system in which, when a switch is in an ON-fixed state during IG-ON of a vehicle, information on the ON-fixed state is stored even after IG-OFF, in a state where it is determined that the switch is in the ON-fixed state and the information on the ON-fixed state is stored, when a next trip after the IG-OFF occurs and it is determined that an ON signal of the switch is not generated, determination of the ON-fixed state of the switch is released. As a result, it is possible to optimize the control in the next trip after the ON fixation determination is made.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a switch system having a switch for operating an in-vehicle device, etc. In particular, the present invention relates to control when a switch is stuck ON. [Background technology]

[0002] Generally, various switches, such as switches for operating air conditioners, are arranged inside a vehicle cabin. Known switches of this type include those that output an ON signal when pressed and an OFF signal when released.

[0003] However, as disclosed in Patent Document 1, for example, a so-called stuck-ON state can occur in which an ON signal from an operated (pushed) switch continues to be output even after the operation is released. This stuck-ON state can occur not only in physical switches (switches that move mechanically by being pushed), but also in touch panel switches.

[0004] Examples of causes of a switch being stuck ON include, if the switch is a physical switch, when it is pressed in it gets caught on another component (such as the frame surrounding the switch) and is unable to return to its original position, or if liquid (such as a drink) is spilled around the switch and the remaining liquid becomes viscous after the water in the liquid evaporates, causing the switch (the pressed switch) to be unable to return to its original position due to that viscosity.Another example of a cause of a stuck ON state in both physical switches and touch panel switches is when an electrical malfunction inside the switch causes the switch to remain in the ON state. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2020-162370 Summary of the Invention [Problem to be solved by the invention]

[0006] However, up until now, with this type of switch, no specific proposals have been made regarding the optimization of control when the switch's stuck-ON state is resolved on the next trip after the stuck-ON determination (IG-OFF, then IG-ON), and there is room for improvement to optimize control in such situations.

[0007] The present invention has been made in consideration of the above points, and its purpose is to provide a switch system that can optimize control in the next trip after a stuck-ON determination has been made. [Means for solving the problem]

[0008] The solution of the present invention for achieving the above object is a switch system having an operation status determination unit that acquires a status signal when a switch is operated, a stuck-ON determination unit that determines a stuck-ON state of the switch when the status signal continues to be output to the operation status determination unit, and a memory unit that stores information about the switch being stuck-ON even after the ignition is turned off if the switch is in the stuck-ON state while the vehicle's ignition is on.The switch system is characterized in that, when the next trip occurs after the ignition is turned off while the stuck-ON determination unit has determined that the switch is in the stuck-ON state and the memory unit has stored the information about the stuck-ON state, the switch system cancels the stuck-ON determination of the switch made by the stuck-ON determination unit if the operation status determination unit has determined that the status signal has not been generated.

[0009] Due to this specification, if the switch is in a stuck-ON state and the stuck-ON determination unit determines that the switch is in the stuck-ON state, the memory unit stores the information that the switch is stuck on even after the vehicle is turned off. Then, in the next trip after the vehicle is turned on, if the operation status determination unit determines that a status signal is being generated (the switch is still stuck on), the stuck-ON determination unit continues to determine that the switch is stuck on. However, if the operation status determination unit determines that the switch is no longer stuck on because the switch is no longer stuck on, the stuck-ON determination unit cancels the switch's stuck-ON determination. As a result, the operation status of the switch is subsequently determined based on the status signal when the switch is operated. In this way, it is possible to optimize control in the next trip after a stuck-ON determination is made. [Effects of the Invention]

[0010] In the present invention, when the switch is determined to be stuck ON and information on the stuck ON state is stored, if the next trip occurs after IG-OFF and it is determined that a status signal has not been generated, the stuck ON state of the switch is canceled, thereby optimizing control in the next trip after the stuck ON state determination has been made. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 2 is a diagram illustrating switches in an air conditioner operation unit according to the embodiment. [Figure 2] 1 is a block diagram showing a schematic configuration of an air conditioning system according to an embodiment. [Figure 3] FIG. 4 is a flowchart showing the procedure of air conditioning control in accordance with switch operations in the embodiment. [Figure 4] 5 is a timing chart illustrating the relationship between a switch depression state and the associated switch determination in the embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In this embodiment, a switch system according to the present invention will be described as being applied as a switch system including a switch for operating an air conditioning device of an electric vehicle. In this embodiment, the switch is a physical switch that outputs an ON signal when pressed and outputs an OFF signal when the pressing operation is released. Note that the switch system according to the present invention is not limited to electric vehicles, and can also be applied to other vehicles (conventional vehicles, hybrid vehicles, plug-in hybrid vehicles, fuel cell vehicles, etc.).

[0013] -Explanation of the air conditioner controls- 1 is a diagram showing the switches of the air conditioner operating unit 1 according to this embodiment. The air conditioner operating unit 1 is disposed on an instrument panel inside the vehicle cabin, and when a passenger presses (pushes) a switch, the air conditioner ECU (described later) controls the air conditioner (air conditioner unit) in response to that operation.

[0014] 1 includes, from the right side in the figure, a driver's seat-side set temperature change switch 11, an air conditioner switch 12, an auto switch 13, an OFF switch 14a, an air volume increase switch 14b, an air volume decrease switch 14c, a blowout mode switch 15, a rear window defogger switch (which also serves as a mirror heater switch) 16a, a front defroster switch 16b, an inside / outside air selector switch 17, and a passenger's seat-side set temperature change switch 18. The driver's seat-side set temperature change switch 11 and the passenger's seat-side set temperature change switch 18 are each equipped with a set temperature increase switch 11a, 18a and a set temperature decrease switch 11b, 18b.

[0015] The operation of the air conditioning unit when these switches 11 to 18 are pressed (in a direction perpendicular to the plane of the paper in FIG. 1) is well known, and therefore will not be described here. Note that the various switches provided on the air conditioning operating unit 1 are not limited to those described above, and may include a sync switch for linking the driver's seat side set temperature and the passenger seat side set temperature, a so-called direct instruction switch for directly instructing each set temperature, a relative instruction switch for raising or lowering the cabin temperature from the current temperature, etc.

[0016] -Outline of air conditioning system configuration- 2 is a block diagram showing a schematic configuration of an air conditioning system 2 according to this embodiment. As shown in Fig. 2, the air conditioning system 2 includes an air conditioning operation section 1 having the above-mentioned multiple switches 11 to 18 (see Fig. 1), an air conditioning unit 3, and an air conditioning ECU 4.

[0017] The air conditioning unit 3 is configured to blow conditioned air, the temperature and humidity of which has been adjusted, into the vehicle interior through an air outlet. The air conditioning unit 3 includes a heat pump 31, a blower 32, an air outlet switching door 33, and the like.

[0018] The heat pump 31 includes, for example, an electric compressor, an outdoor heat exchanger, an indoor heat exchanger, and an expansion valve, and is configured to form a refrigerant circulation path according to the air conditioning demands in the vehicle cabin. The electric compressor is provided to circulate the refrigerant through the circulation path. The electric compressor is powered by power from the battery and is configured so that its rotational speed can be adjusted, for example, by inverter control. In conventional vehicles equipped with an engine, the compressor may be mechanical and operated by engine power. The outdoor heat exchanger is located in the motor compartment, and the indoor heat exchanger is located in an air duct (not shown). The expansion valve reduces the pressure of the refrigerant circulating through the circulation path.

[0019] The blower 32 is configured to selectively take in outside air and inside air and send it to the air duct. The blower 32 is operated by power from a battery and is configured to have an adjustable rotational speed.

[0020] During cooling operation, the outdoor heat exchanger functions as a condenser and the indoor heat exchanger functions as an evaporator, thereby cooling the air being blown by the indoor heat exchanger. During heating operation, the indoor heat exchanger functions as a condenser and the outdoor heat exchanger functions as an evaporator, thereby warming the air being blown by the indoor heat exchanger. Note that a heating heat exchanger may be provided in the air duct separately from the indoor heat exchanger, and the air being blown that has been dehumidified by the indoor heat exchanger may be heated by the heating heat exchanger. In addition, in conventional vehicles equipped with an engine, the heat of the engine coolant is used to heat the passenger compartment.

[0021] A plurality of air outlets are provided at the downstream end of the air duct, and the air outlets are provided with an air outlet switching door 33. The plurality of air outlets include a face air outlet that blows conditioned air toward the upper bodies of occupants in the vehicle cabin, a foot air outlet that blows conditioned air toward the feet of occupants in the vehicle cabin, and a defroster air outlet that blows conditioned air toward the inner surface of the windshield.

[0022] The air conditioner ECU 4 is provided to control the air conditioner unit 3. An ignition (IG) switch 51 and various sensors 52 are connected to the air conditioner ECU 4 via signal lines. As a result, the ON signal (IG-ON signal) and OFF signal (IG-OFF signal) of the IG switch 51 and sensing signals from the various sensors 52 are input to the air conditioner ECU 4. The various sensors 52 include a vehicle interior temperature sensor, an outside air temperature sensor, and a solar radiation sensor.

[0023] Further, the air conditioner ECU 4 (more specifically, the ROM of the air conditioner ECU 4) stores a control program for performing various controls on the air conditioner unit 3.

[0024] The air conditioner ECU 4 has, as its functional units, an operation status determination unit 41, a stuck-ON determination unit 42, a memory unit 43, an IG detection unit 44, and a default set value command unit 45. The operation status determination unit 41, the stuck-ON determination unit 42, the IG detection unit 44, and the default set value command unit 45 are each realized by a control program stored in the ROM of the air conditioner ECU 4. The memory unit 43 is realized by a backup RAM (non-volatile memory) that stores information even after the IG is turned off.

[0025] The operation status determination unit 41 acquires a status signal when any switch in the air conditioner operation unit 1 is operated. For example, when the set temperature UP switch 11a of the driver's seat side set temperature change switch 11 is pressed, its ON signal (ON signal of the set temperature UP switch 11a) is input to the operation status determination unit 41 of the air conditioner ECU 4. When the set temperature UP switch 11a of the driver's seat side set temperature change switch 11 is released from the pressed state, its OFF signal (OFF signal of the set temperature UP switch 11a) is input to the operation status determination unit 41 of the air conditioner ECU 4. When any other switch is pressed or released from the pressed state, its ON signal or OFF signal is similarly input to the operation status determination unit 41 of the air conditioner ECU 4.

[0026] When an ON signal (status signal) is continuously input from a certain switch to the operation status determination unit 41, the stuck-ON determination unit 42 determines that the switch is in the stuck-ON state. For example, when an ON signal is continuously output from the set temperature up switch 11a of the driver's seat side set temperature change switch 11 for a predetermined time (e.g., 5 seconds) and this ON signal is continuously input to the operation status determination unit 41, the set temperature up switch 11a is determined to be in the stuck-ON state. The value of this predetermined time is not limited to this. When an ON signal is continuously output from another switch for a predetermined time, the switch outputting the ON signal is also determined to be in the stuck-ON state. Information on the result of the determination by the stuck-ON determination unit 42 is output to the memory unit 43 and the default set value command unit 45. A feature of this stuck-ON determination unit 42 is that when the vehicle is next tripped due to IG-ON after IG-OFF, if an OFF signal is input to the operation status determination unit 41 from the switch that was determined to be in the stuck-ON state, the determination that the switch is in the stuck-ON state is cancelled.

[0027] The memory unit 43 stores the previous setting values ​​for air conditioning control and information on whether the switches are stuck on. Storing the previous setting values ​​for air conditioning control means that if the air conditioning unit 3 was operating while the vehicle's ignition was on and the ignition was then turned off, the memory stores information on the set airflow and set temperature immediately before the ignition was turned off. Storing information on whether the switches are stuck on means that if the stuck-on determination unit 42 determines that a switch is stuck on while the vehicle's ignition is on, the memory stores information that the switch is stuck on even after the ignition is turned off. This information is also stored at the start of the next trip when the vehicle's ignition is turned on after the ignition is turned off.

[0028] The IG detector 44 receives an ON signal or an OFF signal from the IG switch 51 and outputs the information to the default setting value command unit 45 .

[0029] The default set value command unit 45 can receive signals from the stuck-ON determination unit 42 and the IG detection unit 44. If the stuck-ON determination unit 42 determines that a switch is stuck-ON while the IG is ON, the default set value command unit 45 transmits a default set value command signal as a command signal to the device targeted by that switch (the switch stuck-ON). This default set value may be, for example, zero for the air volume blown by the blower 32, or 25°C for the set temperature of the conditioned air in the heat pump 31. In other words, if the air volume increase switch 14b or the air volume decrease switch 14c is stuck-ON, the air volume blown by the blower 32 is set to zero (the blower 32 is stopped). If the set temperature UP switch 11a or the set temperature DOWN switch 11b of the driver's seat side set temperature change switch 11 is stuck-ON, the driver's seat side set temperature is set to 25°C. Similarly, if the set temperature UP switch 18a or set temperature DOWN switch 18b of the passenger seat set temperature change switch 18 is stuck ON, the passenger seat set temperature will be set to 25° C. These values ​​can be set arbitrarily, but it is preferable to set them to values ​​that will enable a significant reduction in power consumption.

[0030] Furthermore, when information that a certain switch is in a stuck-ON state is stored in the memory unit 43, even at the start of the next trip due to IG-ON after IG-OFF, the default set value command unit 45 transmits a default set value command signal to the air conditioning unit 3 as a command signal for the device targeted by that switch (the switch stuck-ON state). In other words, even when IG-ON is turned on while a certain switch is stuck-ON, the device targeted by that switch (the switch stuck-ON state) is controlled by the default set value.

[0031] With such a system configuration, the air conditioner operating unit 1 and the above-mentioned functional units in the air conditioner ECU 4 constitute a switch system according to the present invention.

[0032] -Air conditioning control- Next, air conditioning control when a switch is operated in the above-described configuration will be described with reference to Figs. 3 and 4. Fig. 3 is a flowchart showing the procedure for air conditioning control in accordance with switch operation in this embodiment. Fig. 4 is a timing chart showing the relationship between the switch depression state and the associated switch determination. The following description focuses on one switch (for example, air volume increase switch 14b) among switches 11 to 18.

[0033] First, in step ST1, it is determined whether the IG is turned on (whether the IG detection unit 44 receives an ON signal from the IG switch 51). If the IG is not turned on and the determination is NO in step ST1, the process ends.

[0034] On the other hand, if the IG-ON switch is turned on and the determination in step ST1 is YES, the process proceeds to step ST2, where it is determined whether or not information about the switch being stuck on is stored in the memory unit 43. If none of the switches are in a stuck-on state and no information about the switch being stuck on is stored in the memory unit 43, the determination in step ST2 is NO and the process proceeds to step ST3. In step ST3, air conditioning control is started using the previous setting values ​​for air conditioning control (the set air volume and set temperature in the previous trip) stored in the memory unit 43, and the process proceeds to step ST4.

[0035] In step ST4, it is determined whether or not a certain switch (for example, air volume increase switch 14b) has been pressed and an ON signal (switch ON signal) has been input (input to operation status determination unit 41) from the switch.

[0036] If an ON signal is input from the switch and the determination in step ST4 is YES, the process proceeds to step ST5, where air conditioning control is performed in accordance with the switch operation. For example, if the air volume increase switch 14b is pressed, the air volume of the blower 32 is increased by one level. If the switch is pressed and held down, air conditioning control is performed in accordance with the operation every predetermined time. For example, if the air volume increase switch 14b is pressed and held down, the air volume of the blower 32 is increased by one level every predetermined time.

[0037] When air conditioning control according to the switch operation is started in this way, in step ST6, a timer provided in the air conditioner ECU 4 starts counting, and the process proceeds to step ST7. In this step ST7, it is determined whether the count of the timer has exceeded a predetermined ON-stuck determination time. In other words, it is determined whether an ON signal from the switch has been continuously input for a predetermined time. This ON-stuck determination time can be set arbitrarily.

[0038] If the count of the timer has not yet exceeded the predetermined ON-stuck determination time and the determination is NO in step ST7, the process proceeds to step ST8, where it is determined whether the input of the ON signal from the switch is continuing. If the input of the ON signal from the switch has stopped, the determination is NO in step ST8 and the process proceeds to step ST10, whereas if the input of the ON signal from the switch is continuing, the determination is YES in step ST8 and the process returns to step ST7.

[0039] If the ON signal input from the switch is not stopped and the time during which the ON signal continues to be input (the timer count) exceeds the stuck-ON determination time, a YES determination is made in step ST7, and the process proceeds to step ST9. In step ST9, the stuck-ON determination unit 42 determines that the switch is in a stuck-ON state, stores information about the stuck-ON state in the memory unit 43, and sends a default set value command signal from the default set value command unit 45 to the air conditioning unit 3. FIG. 4(a) shows the relationship between the switch pressed state and the associated switch determination at this time. In other words, because the switch pressed state exceeds a predetermined time (the stuck-ON determination time), the switch is determined to be in a stuck-ON state. If the switch is determined to be in this stuck-ON state, air conditioning control is performed using the default set value. For example, if it is determined that the air volume increase switch 14b is in a stuck-ON state, the air volume of the blower 32 is set to zero (the blower 32 is stopped). Also, for example, if it is determined that the set temperature UP switch 11a of the driver's seat side set temperature change switch 11 is stuck ON, the driver's seat side set temperature is set to 25° C. After air conditioning control using the default set value is started in this way, the process proceeds to step ST10.

[0040] In step ST10, it is determined whether the IG has been turned off (whether the IG detection unit 44 has received an OFF signal from the IG switch 51). If the IG has been turned off and the determination in step ST10 is YES, the air conditioning control is stopped and the control ends. On the other hand, if the IG has not been turned off (the IG remains on) and the determination in step ST10 is NO, the process proceeds to step ST11, where it is determined whether information indicating that the switch is stuck on is stored in the memory unit 43. That is, if the determination in step ST7 is YES (the switch is determined to be in a stuck-on state), it is determined in step ST9 whether information indicating that the switch is stuck on is stored in the memory unit 43. If information indicating that the switch is stuck on is not stored in the memory unit 43 and the determination in step ST11 is NO, the process proceeds to step ST12, where air conditioning control is performed in accordance with the switch operation. On the other hand, if information indicating that the switch is stuck on is stored in the memory unit 43 and the determination in step ST11 is YES, the process proceeds to step ST13.

[0041] In step ST13, air conditioning control is performed using default setting values ​​based on the default setting value command signal sent from the default setting value command section 45 to the air conditioning unit 3 (if air conditioning control using default setting values ​​is performed in step ST9, that air conditioning control is continued). Then, in step ST14, it is determined whether or not an OFF signal (switch OFF signal) has been input (input to the operation status determination section 41) from the switch that has been determined to be in a stuck ON state.

[0042] If an OFF signal is not input to the operation status determination unit 41 from the switch that was determined to be in the stuck-ON state and a NO determination is made in step ST14, the process returns to step ST10. On the other hand, if an OFF signal is input to the operation status determination unit 41 from the switch that was determined to be in the stuck-ON state and a YES determination is made in step ST14, the process proceeds to step ST15, where the information about the stuck-ON state stored in the memory unit 43 is released. In other words, the switch that was in the stuck-ON state has returned to its original position, so the information about the stuck-ON state is released. Thereafter, the process proceeds to step ST16, where normal air conditioning control according to the operation of the switch is restored.

[0043] Furthermore, if the switch is determined to be stuck-ON in step ST9 and the IG is turned OFF in step ST10 while the information indicating that the switch is stuck-ON is stored in the memory unit 43, then in the next trip (next routine) due to the subsequent IG ON, both steps ST1 and ST2 will return YES, and air conditioning control will be performed using the default setting value based on the default setting value command signal sent from the default setting value command unit 45 to the air conditioning unit 3. If, in step ST14, an OFF signal is not input to the operation status determination unit 41 from the switch determined to be stuck-ON, the process proceeds to step ST10. FIG. 4(b) shows the relationship between the switch pressed state and the associated switch determination at this time. That is, because the switch is in the stuck-ON state, the pressed state is maintained, but because the stuck-ON state is stored, the switch determination is OFF (a state in which switch operation is not accepted).

[0044] Furthermore, if an OFF signal is input to the operation status determination unit 41 from a switch that has been determined to be in a stuck-ON state, the information about the stuck-ON state stored in the memory unit 43 is released in step ST15. In other words, the switch that was in a stuck-ON state has returned to its original position, and the information about the stuck-ON state is released. Then, the process proceeds to step ST16, and normal air conditioning control is restored in accordance with the switch operation. Figure 4(c) shows the relationship between the switch depression state and the associated switch determination at this time. In other words, the switch determination determines that the switch has returned to a normal state because the switch has returned to its original position, and if the switch is subsequently pressed, the switch determination also determines that the switch has been turned ON accordingly. The above operations are repeated.

[0045] -Effects of the embodiment- As described above, according to this embodiment, when the stuck-ON determination unit 42 determines that the switch is in a stuck-ON state and the stuck-ON information is stored in the memory unit 43, if the next trip occurs after IG-OFF and an OFF signal is input from the switch (if it is determined that a status signal has not been generated), the stuck-ON information stored in the memory unit 43 is cancelled (the stuck-ON determination of the switch is cancelled). This makes it possible to optimize control in the next trip after the stuck-ON determination has been made.

[0046] (Compared to conventional switches) Here, we will compare it with a conventional general switch and explain how the switch system according to this embodiment can solve the problems that occurred in the three types of conventional general switches.

[0047] First, a comparison with a so-called non-latching switch will be described as a first conventional switch. This non-latching switch is used, for example, in a vehicle as a drive mode selector switch or an idle stop switch. When the ignition is turned on after being turned off, the switch state immediately before the ignition is turned off is canceled (the switch is turned off), and the settings at the time of the ignition being turned off are not retained. However, when this type of switch is used as an air conditioning switch, the air conditioning settings (airflow rate and set temperature) at the time of the ignition being turned off are not retained, which causes the inconvenience of having to change the air conditioning settings every time the ignition is turned on. In this embodiment, as described in step ST3 of the flowchart, the air conditioning control is performed using the previous air conditioning control settings stored in the memory unit 43. This allows the air conditioning settings (airflow rate and set temperature) at the time of the ignition being turned off to be retained, eliminating the inconvenience of having to change the air conditioning settings every time the ignition is turned on.

[0048] A comparison with an OFF edge detection switch will be described as a second conventional switch. This OFF edge detection switch is known to perform a switch-ON determination when the switch is pressed and then released. FIG. 4(d) shows the relationship between the pressed state of this OFF edge detection switch and the associated switch determination. However, when this type of switch is in a stuck-ON state, the pressed state of the switch is not released, so the switch-ON determination is not performed, and as a result, the stuck-ON determination is not performed either. In other words, it is not possible to determine that the switch is in a stuck-ON state. In this embodiment, the switch-ON determination is performed when the switch is pressed, so the stuck-ON determination of the switch can be performed successfully.

[0049] A third type of conventional switch is known, which determines that a switch has failed if an ON signal is output continuously for a predetermined period of time. However, with this type of switch, if an object in the vehicle cabin continues to hit the switch, the switch may be determined to be faulty even though it is not, and excessive measures may be taken to address this. In this embodiment, even if the switch is initially determined to be stuck ON, if an OFF signal is output from the switch, it will return to a normal state, thereby solving the problem with the switch.

[0050] -Other embodiments- The present invention is not limited to the above-described embodiments, and all modifications and applications within the scope of the claims and equivalents thereto are possible.

[0051] For example, in the above embodiment, the present invention has been described as being applied to a switch system having a switch for operating an air conditioning unit of a vehicle (electric vehicle), but the present invention is not limited to this and can also be applied to switch systems provided in various devices.

[0052] In the above embodiment, the switch is a physical switch that outputs an ON signal when pressed and an OFF signal when the pressing operation is released. The present invention is not limited to this, and may be a physical switch that outputs 0V when not pressed and outputs a predetermined voltage (for example, 5V) when pressed. Also, a physical switch equipped with a function for determining a stuck-ON state may be applied. Furthermore, the present invention is not limited to physical switches and can be applied to touch panel switches as well. [Industrial Applicability]

[0053] The present invention is applicable to control when a switch in a switch system for operating an air conditioner of a vehicle is stuck ON. [Explanation of symbols]

[0054] 11, 18...Set temperature change switch 14b...Air volume increase switch 14c...Air volume decrease switch 41... Operation status determination unit 42... ON stuck determination unit 43... Memory unit 44... IG detection unit 51...IG switch

Claims

[Claim 1] an operation status determination unit that acquires a status signal when a switch is operated; a stuck-ON determination unit that determines a stuck-ON state of the switch, which is a state in which the state signal continues to be output to the operation status determination unit; a storage unit that stores information about the switch being stuck in the ON state even after the IG is turned OFF when the switch is stuck in the ON state while the IG of the vehicle is turned ON, A switch system characterized in that, when the ON-stuck determination unit determines that the switch is in an ON-stuck state and the memory unit stores the ON-stuck information, if the next trip occurs after the IG is turned OFF and the operation status determination unit determines that the status signal has not been generated, the ON-stuck determination unit cancels the ON-stuck determination of the switch.

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