JP4049050B2 - Drive device - Google Patents

Description

  The present invention relates to a drive device for driving a motor for opening and closing a power window of a vehicle, and even when a submergence accident due to a fall of the vehicle to the sea or the like occurs, the motor can be prevented from being operated freely, and galvanic corrosion or the like. The present invention relates to a drive device that is less likely to occur, can reliably realize at least a specified direction of operation according to an operation, and can detect a submergence failure state with a simple configuration and realize a predetermined submergence countermeasure accurately and inexpensively.

  In general, as a control method for an opening / closing mechanism such as a power window (especially a driver's seat side window) of a vehicle, electronic control that realizes an automatic window reversal function (anti-pinch function) at the time of pinch detection has become the mainstream. For this reason, as a driving device that appropriately supplies power to a motor that is a driving source of the opening and closing mechanism and controls its operation, a driving method using a relay is adopted as shown in Patent Documents 1 and 2, for example. Those equipped with a control circuit including a microcomputer (hereinafter referred to as a microcomputer) have become common.

  That is, basically, this type of driving device supplies power to the motor 1 to rotate the motor 1 in the normal rotation direction (for example, the DOWN direction for opening the vehicle window), as shown in FIG. 4A or 4B, for example. Or two relays 2 and 3 for driving in the reverse direction (for example, UP direction for closing the vehicle window), and operation switches 4 and 5 for instructing the operation of the motor 1 in the forward direction or the reverse direction, and this operation And a control circuit 6 that controls the relays 2 and 3 in response to operation inputs of the switches 4 and 5.

Here, each relay includes an exciting relay coil 2a, 3a, a common terminal (hereinafter referred to as C terminal), a normally open terminal (hereinafter referred to as NO terminal), and a normally closed terminal (hereinafter referred to as NC terminal), for example. In the non-operating state in which the relay coil is not energized (ie, excited), the C terminal and the NC terminal are connected, and the relay coil is energized. In the broken operation state, the C terminal and the NO terminal are connected.
The NO terminals of these relays 2 and 3 are connected to a power supply line L1 (a line connected to the high potential side of the power supply; for example, 12V), and the NC terminal is connected to the ground line LG. The C terminal of the relay is connected to either one of both terminals of the motor coil (a predetermined terminal that realizes normal rotation or reverse rotation).

  The operation switches 4 and 5 have switch contacts (normally open type so-called “a contacts”) that are operated by operation of a common operation unit (such as a swinging operation knob) that can be operated by a driver of the vehicle. Each switch contact has a C terminal connected to, for example, a ground line LG, an NO terminal connected to an input terminal of the control circuit 6, and is connected to, for example, a power supply line L2 via a pull-up resistor.

  Further, the control circuit 6 has switching elements (in this case, FIG. 4 (FIG. 4A)) provided on the energization lines of the relay coils 2a and 3a (the ground side in FIG. 4A and the high potential side in FIG. 4B). a) includes NPN transistors 7 and 8; in FIG. 4B, PNP transistors 9 and 10); and a processing circuit 11 (for example, including a one-chip microcomputer) for driving and controlling the switching elements.

  The processing circuit 11 reads the terminal voltage of each NO terminal of the operation switches 4 and 5, determines whether or not the operation unit has been operated in any direction, and determines the predetermined relay coil according to the determination result. Energization control (that is, forward or reverse drive control of the motor) is executed. That is, when the operation unit is operated in one direction (direction instructing normal rotation), for example, the processing circuit 11 is in a state where the C terminal of the operation switch 4 and one NO terminal are connected to each other. Becomes the ground level, it is determined that an operation command for rotating the motor 1 forward, for example, is input, and a drive signal for turning on the switching element (transistor 7 or 9) on the forward rotation side is output. Then, when the forward rotation side switching element is turned on, the forward rotation side relay 2 is operated, and one of the two terminals of the motor coil (the forward rotation side) is connected via the C terminal and the NO terminal of the relay 2. Only the terminal) is connected to the power supply line L1, and the motor rotates forward, for example.

  For example, in the case of a vehicle power window, depending on the vehicle type or seat (especially the driver's seat side window), an automatic operation function (for example, if the operation knob is operated largely in the opening direction, the window is opened to the fully opened position even if the operation knob is stopped). Is automatically operated). In this case, a contact for auto operation is further provided as a contact of the operation switch. When this contact is turned on (that is, when auto operation is instructed), either relay is fully opened or controlled by the control of the processing circuit 11. It continues to be driven to the fully closed position, and the automatic operation in the commanded direction is realized.

JP-A-11-36700 Japanese Patent Application Laid-Open No. 11-41961

  However, in the above-described conventional drive device, when a leak occurs on the downstream side of the relay coil when submerged, depending on the leak resistance, either or both relays are turned on regardless of the user's intention, and the window opens. There was a problem that it could operate without permission or that the window would not operate in response to a user operation.

  Therefore, Patent Document 1 discloses a technique for detecting the submergence, turning on both relays at the same time, and connecting both terminals of the motor coil to the power supply line in order to solve the problem that the window operates arbitrarily when submerged. Has been. However, in this case, since both terminals of the motor coil are at a high potential (battery voltage) when submerged in water, the circuit conductors constituting the motor coil and its energization line due to leakage to the chassis (vehicle body) at the ground level If the electrical corrosion (corrosion caused by the flow of electricity) is significantly accelerated, or if the harness that constitutes the motor energizing line is sandwiched between the door and the body, both relays will be There is a problem that smoke or ignition may occur at the same time when they are turned on.

In addition, in a system drive device in a vehicle such as a power window, the terminal of the battery voltage and other circuit conductors in the vehicle occupy the ground potential. Eventually, it will corrode and become open and fail to satisfy its original function, which may lead to system malfunction. In addition, around the terminals that output the battery voltage, etc., because of the electrolysis between the battery voltage and the ground potential, the flow of charges starts rapidly when submerged, and the surrounding circuits are likely to leak when submerged, thereby causing malfunctions. There was a problem that is likely to cause.
In addition, the technique disclosed in Patent Document 1 has a problem that it is impossible to reliably realize the operation of the motor according to the operation when submerged.

  Next, in Patent Document 2, switching elements (transistors) or switch contacts are provided on both sides of the relay coil in order to ensure that the window can be reliably operated (at least can be operated in the opening direction) when submerged. An apparatus is disclosed that reliably drives only a predetermined relay coil by synchronously turning on both sides of one relay coil in accordance with the operation direction when the switch is operated. However, since this device does not have a function of detecting whether or not it is submerged, it can only be operated in a specified direction (for example, the opening direction of the window) when submerged, and other operations are prohibited or submerged. There is a problem that measures against submersion such as keeping records cannot be taken.

  In addition, the submergence detection means (a submergence detection gap, a submergence detection pad, a submergence detection open terminal, etc.) is separately provided for the apparatus of Patent Document 2 to detect submergence as in Patent Document 1. It is possible to implement submersion measures. However, the provision of submergence detection means has a detrimental effect such as an increase in cost. Also, the submergence detection means detects the submergence itself, so even if the motor is not likely to malfunction due to submergence (submergence failure state), the submergence countermeasures are executed, for example, in the specified direction. There is also a problem that the operation (for example, the operation in the closing direction of the window) is prohibited, or the relay in both directions is turned on and the entire operation of the motor is prohibited as in Patent Document 1.

  Therefore, the present invention relates to a drive device for driving a motor for opening and closing a power window of a vehicle, and even when a submergence accident due to a fall of the vehicle into the sea or the like occurs, it is possible to prevent the motor from operating freely and Providing a drive device that can reliably achieve at least a specified direction of operation according to the operation, detect a submergence failure state with a simple configuration, and implement a predetermined submergence countermeasure accurately and inexpensively. The purpose is to do.

The drive device of the present application has a forward rotation relay and a reverse rotation relay that supply power to the motor to rotate the motor in the normal direction or the reverse direction, respectively, and is in an operating state of the operation unit that commands the operation in the forward direction or the reverse direction of the motor. In response, a driving device that operates one of the two relays to drive the motor in the forward direction or the reverse direction,
A high-potential side switching element for normal rotation that opens and closes between the high-potential side terminal of the coil of the forward-rotation relay and the high-potential side of the power source;
A high potential side switching element for reverse rotation that opens and closes between a high potential side terminal of the coil of the reverse relay and a high potential side of the power source;
A forward-rotating low-potential side switching element that opens and closes between a low-potential-side terminal of the coil of the forward-rotating relay and the ground side;
A low potential side switching element for reverse rotation that opens and closes between a low potential side terminal of the coil of the reverse relay and the ground side;
A forward coil voltage detecting means for detecting a voltage between terminals of the coil of the forward relay;
A reverse coil voltage detecting means for detecting a voltage between terminals of the coil of the reverse relay;
A control unit having a function of executing a diagnosis process when a predetermined diagnosis condition is satisfied, and a function of executing a normal control at least in a normal state;
In the normal control, when the operation unit is in a non-operating state, the forward high potential side switching element, the normal rotation low potential side switching element, the reverse rotation high potential side switching element, and the reverse rotation low potential side switching element are turned off. When the operation unit is in an operation state in which the operation unit is instructed to operate in the normal rotation direction of the motor, the high-potential switching element for normal rotation and the low-potential switching element for normal rotation are turned on. When the operation unit is in an operation state in which the operation unit is commanded to operate in the reverse direction of the motor, the high potential side switching element for reverse rotation and the low potential side switching element for reverse rotation are turned on to reverse the motor,
Each of the diagnostic processing is detected by the forward rotation coil voltage detection means and the reverse rotation coil voltage detection means with the forward rotation high potential side switching element and the reverse rotation high potential side switching element turned on (closed state). The terminal voltage is read and both the forward terminal voltage detected by the forward coil voltage detecting means and the reverse terminal voltage detected by the reverse coil voltage detecting means are both equal to or higher than the relay operating voltage. If it is, it is judged that it is a submerged failure state.

Here, the “motor” is an actuator that outputs a mechanical driving force by electric power, and is not necessarily limited to a rotary motor, and may of course be a linear motor. Further, “forward rotation” or “reverse rotation” means an operation in one direction or the other direction of the “motor”, and is not necessarily limited to a rotational movement in one direction or the other direction.
The “ground side” means an earth line or a line connected to the low potential side of the power source.
In addition, “more than” in “both voltages between terminals are equal to or higher than the relay operating voltage” does not necessarily mean strictly. For example, the content may be determined to be “above operating voltage” when the difference between the inter-terminal voltage and the relay operating voltage is less than or less than a specified allowable value in order to increase the sensitivity of submergence failure determination as necessary. Alternatively, the “relay operating voltage” may be set to a value that is lower than the actual relay operating voltage by a required margin (for example, an allowance in consideration of fluctuations in battery voltage, etc.).

The “coil voltage detection means” outputs, for example, a signal voltage corresponding to the voltage of the high potential side terminal of the coil (which may be a power supply voltage applied to the high potential side terminal) and the voltage of the low potential side terminal, respectively. Voltage detection means (for example, a signal line connected to each coil terminal or a power source and a voltage dividing resistor) and arithmetic means for calculating a difference between these signal voltages as the inter-terminal voltage (for example, a difference circuit, Or a microcomputer). When the power supply voltage applied to the high potential side terminal of the coil is constant, a value corresponding to the power supply voltage may be given to the arithmetic means as a constant value. Needless to say, the voltage detecting means is not always necessary.
In the diagnosis process, the process for determining whether or not each terminal voltage is equal to or higher than the relay operating voltage may be substantially executed. For example, as in an embodiment described later, a relay operation low potential side voltage (Von = VBAT−VRY) which is a difference between the battery voltage (VBAT) and the relay operation voltage (VRY) is obtained, and the low potential of each relay coil is obtained. If the side terminal voltage (Vup, Vdn) is less than or equal to this relay operation low potential side voltage (Von), the voltage between the terminals (VBAT-Vup, VBAT-Vdn) is greater than or equal to the relay operation voltage (VRY). The processing content that is determined to be a failure state may be used.

The “diagnostic condition” means that, for example, the operating unit is in a non-operating state, and any switching element is not to be driven for motor operation. That is, for example, at a certain cycle, it is determined whether or not the operation unit is in a non-operating state and not in an automatic operation state. The diagnosis process may be executed. In order to properly execute the diagnosis process, it is necessary to set such a condition because normal control for driving the switching elements on both sides of the relay coil cannot be performed. However, a specification for executing the diagnosis process in preference to the normal control (for example, when the operation unit is operated at the diagnosis process execution timing, the normal process is suspended and the diagnosis process is executed first. For example, the diagnosis condition may be satisfied and the diagnosis process may be executed whenever a certain execution cycle elapses.
The “normal state” means a state in which the apparatus operates normally and is not determined as a failure state (a submerged failure state or a circuit failure state described later).

  In the drive device of the present application, switching elements are provided on both sides of each relay coil. When not operated, all the switching elements are basically kept off (except during execution of diagnostic processing). By turning on only the switching elements on both sides of one relay coil corresponding to the operation direction, only the predetermined relay coil is reliably driven. For this reason, at the time of non-operation, the both ends of each relay coil are basically maintained in a state of being disconnected from the energization line (each relay is in an off state), and the motor can be prevented from operating arbitrarily even if submerged. Basically (except when the motor operation is restricted to one direction in the operation direction restricted state described later), the operation in both directions according to the operation is reliably realized even when submerged. In addition, if the motor coil terminal is in a non-operating state when submerged, both of the potentials of the motor coil terminals can be stably maintained at the ground potential, so that the above-described problems of firing due to electrolytic corrosion and leakage and malfunction of peripheral circuits can be solved.

  Further, according to the driving device of the present application, the diagnosis process executed when the diagnosis condition is satisfied, without providing a submergence detection unit, accurately a state where a malfunction is likely to occur due to submergence (submergence failure state). It can be detected inexpensively with a simple configuration. The diagnosis process reads the voltage between terminals of each relay coil when only the switching elements on the high potential side are turned on, and determines that the submergence failure state is obtained when both the terminal voltages are equal to or higher than the relay operating voltage. Is. For this reason, if leakage to the ground side that causes the relay to malfunction occurs on the low potential side of each relay coil, it is determined that the submergence failure state is caused by this diagnostic processing. When submerged, it is unlikely that leaks will occur on only one side of the relay coil except in the initial stage of submergence, and leaks on the low potential side of the relay coil are likely to cause malfunctions. The state is judged more accurately.

Next, according to a preferred aspect of the present application, when the control means determines that a submergence failure state is present in the diagnostic processing, only the motor operation in a predetermined specified direction (for example, a window opening direction) can be operated. The operation direction is restricted, and in this operation direction restriction state, the forward high potential side switching element, the forward low potential side switching element, the reverse rotation, unless the operation unit is in the operation state instructed to operate in the specified direction of the motor. The high potential side switching element for switching and the low potential side switching element for reverse rotation are maintained in the OFF state.
In such a mode, in the submerged failure state, the motor operation in the specified direction is enabled, and all the motor operations other than the specified direction operation are surely prohibited, in addition to the arbitrary operation of the motor, Inadvertent motor operation in the direction (for example, the closing direction of the window) can be prevented.

  However, the countermeasures at the time of submergence fault detection in the present application are not limited to the above countermeasures (measures that allow only the motor operation in the specified direction to be operated). Different countermeasures may be taken (for example, one that allows operation in both directions as usual, or one that prohibits operation in both directions). In addition, it is not limited to the countermeasures related to the motor operation as described above, and when a submerged failure state is detected, for example, a measure for outputting an alarm is executed, or a process for leaving a record (eg, diagnostic data) is executed. May be.

According to another preferable aspect of the present application, the control unit is configured such that, in the diagnosis process, when one of the forward-side terminal voltage and the backward-side terminal voltage is equal to or higher than the relay operating voltage, a low potential is set. It is determined that the side circuit is faulty.
According to such an aspect, the diagnosis processing can accurately and inexpensively detect a low-potential side circuit fault state in addition to a submerged fault state.
Here, the “low-potential side circuit failure state” means that, for example, the output circuit that drives the low-potential side switching element fails, and the low-potential side switching element is irrelevant to the operation (regardless of the control of the control means) Means a fault that remains on. Such a failure is unlikely to occur at the same time for both relay coils, unlike leakage due to submergence. Therefore, the determination condition as described above (any one of the forward-side terminal voltage and the reverse-side terminal voltage) It is possible to make an accurate determination based on whether one is equal to or higher than the relay operating voltage. Further, since the diagnosis process is performed in a state where only the high-potential side switching element is controlled to be in the on state (closed state) as described above, the above-described determination condition is satisfied in this state. It can be determined that the circuit failure is related to the low-potential side switching element (that is, the low-potential side circuit failure state).

Note that in a transient state in the initial stage of submergence, water may enter a part of the apparatus, and a predetermined leak may temporarily occur only on one relay coil side. For this reason, in the determination of the circuit failure state, a determination period of a certain time or more is provided, and for example, only when the determination condition is satisfied throughout the determination period, the circuit failure state is determined. The reliability of the determination may be improved (the possibility of erroneously determining a submerged failure state as a circuit failure state) is reduced.
In addition, as countermeasures when detecting a circuit failure state, for example, the motor operation in both directions is prohibited (all switching elements are maintained in an off state regardless of the operation state), an alarm is output, and the recording (for example, a diagram) Data).

According to another preferable aspect of the present application, the control unit turns off the forward high potential side switching element, the normal rotation low potential side switching element, the reverse rotation high potential side switching element, and the reverse rotation low potential side switching element. As a state (controlled to OFF state), the terminal voltage of the coil for the forward and reverse relays is read, and if any terminal voltage is the high potential side voltage of the power supply, the high potential side circuit failure The high-potential side failure determination process for determining that the state is in a state has a function of executing when a predetermined execution condition is satisfied.
In such a mode, the high potential side failure determination process enables accurate and inexpensive detection of the high potential side circuit failure state in addition to the submergence failure state (or even the low potential side circuit failure state).

Here, the “high potential side circuit failure state” means that, for example, the output circuit that drives the high potential side switching element fails, and the high potential side switching element is irrelevant to the operation (regardless of the control of the control means). Means a fault that remains on. When such a failure occurs, the coil terminal voltage becomes substantially equal to the high potential side voltage of the power source even though all the switching elements are controlled to be in the OFF state. This failure can be detected.
The “coil terminal voltage” may be the voltage at the high potential terminal of the coil or the voltage at the low potential terminal of the coil. Further, the means for detecting the terminal voltage can be realized by the above-described voltage detecting means constituting the coil voltage detecting means.
In addition, the “execution condition” for executing the above-described high-potential-side failure determination process may be set based on the same concept as the above-described “diagnosis condition”. That is, the above-described high-potential-side failure determination process may be executed, for example, under the same conditions as the above-described diagnosis process, and may be executed, for example, at a timing immediately before or after the above-described diagnosis process.
In addition, in "Determining that the terminal voltage is the high potential side voltage of the power supply" in "Determining that the high potential side circuit is faulty when the terminal voltage is the high potential side voltage of the power supply" This means that the terminal voltage is substantially equal to the high potential side voltage (that is, the power supply voltage) of the power supply in consideration of required errors and margins.

  According to the drive device of the present invention, it is possible to prevent malfunctions that cause the motor to operate without permission due to leakage due to submergence, and to solve the problems such as electric corrosion and ignition described above, and to stabilize operation during submergence. Effect. In addition, basically, even when submerged, the motor can be reliably operated according to the operation of the operation unit. In addition, according to the present drive device, a state in which there is a high possibility of malfunction due to submersion (submergence failure state) can be accurately performed without a separate submergence detection means by a diagnostic process executed when a predetermined diagnosis condition is established. It can be detected inexpensively with a simple configuration.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a main part of a circuit configuration of a driving device (a driving device for a power window of a vehicle) of this example. The external appearance of the device and the mechanical structure of the switch operating unit are not shown. Further, the same components as those of the conventional apparatus shown in FIG. In the following description, it is assumed that the opening direction of the window is the normal rotation direction of the motor 1.

As shown in FIG. 1, this device includes transistors 21 (TR 1), 22 (TR 2), 23 (TR 3), 24 (TR 4) for relay energization, a switch contact for forward rotation 25 (DOWNSW), and a switch for reverse rotation. A contact 26 (UPSW), an auto switch contact 27 (AUTOSW), transistors 28 and 29 for driving control of the transistors 21 and 22, and a control processing circuit 50 are provided.
In FIG. 1, the reference numerals 30 to 41 indicate resistors for voltage division, pull-down or pull-up, and the reference numerals 42 and 43 protect the transistors 21 to 24 from the back electromotive voltage when the relay is off. It is a diode for.

The transistor 21 (TR1) is a forward high potential side switching element that opens and closes between the high potential side terminal of the coil 2a of the forward relay 2 and the high potential side of the power supply (power supply line L1; for example, 12V).
The transistor 22 (TR2) is a reverse high potential side switching element that opens and closes between the high potential side terminal of the coil 3a of the reverse relay 3 and the power supply line L1.
The transistor 23 (TR3) is a forward rotation low potential side switching element that opens and closes between the low potential side terminal of the coil 2a of the forward rotation relay 2 and the ground side.
The transistor 24 (TR4) is a reverse low potential side switching element that opens and closes between the low potential side terminal of the coil 3a of the reverse relay 3 and the ground side.

  In this case, the transistors 21 and 22 are PNP transistors, and the transistors 23 and 24 are NPN transistors. However, it goes without saying that the specific example of the switching element for energizing the relay is not limited to this mode. . For example, these switching elements may be configured by FETs (field effect transistors).

The forward rotation switch contact 25 (DOWNSW) is a normally open switch contact (so-called a contact) that is closed when the operation unit is in a state of commanding a manual operation or an automatic operation in the forward direction of the motor 1. .
The reverse switch contact 26 (UPSW) is an a contact that is closed when the operation unit is in a state of instructing a manual operation or an automatic operation in the reverse direction of the motor 1.

The auto switch contact 27 (AUTOSW) is an a contact that is closed when the operation unit is in a state of instructing an auto operation in each direction of the motor 1.
In this case, one terminal (high potential side terminal) of the forward switch contact 25, the reverse switch contact 26, and the auto switch contact 27 is connected to the power supply line L2 (voltage) via the pull-up resistor 38 as shown in FIG. Vdd (for example, 5 V) and connected to input terminals IMD, IMU, and IA (described later) of the control processing circuit 40 via the voltage dividing resistor 39, and the other terminal (low potential side terminal) is connected to the ground line LG. It is connected.

  The transistors 28 and 29 are NPN transistors, and their collector terminals are connected to the base terminals of the transistors 21 and 22 via the voltage dividing resistor 31 and are connected to the power supply line via the voltage dividing resistor 31 and the pull-up resistor 30. Connected to L1. The base terminals of the transistors 28 and 29 are connected to output terminals OD1 and OU1 (to be described later) of the control processing circuit 40 through the voltage dividing resistor 33, and are connected to the ground line LG through the pull-down resistor 32. Yes. The emitter terminals of these transistors 28 and 29 are connected to the ground line LG.

The control processing circuit 50 is a circuit including a microcomputer, and has IA, IMD, IMU, ID, IU, IB, OD1, OD2, OU1, and OU2 as signal terminals.
Among these, IA is connected to the high potential side terminal of the auto switch contact 27 via the voltage dividing resistor 39, and when the auto switch contact 27 is turned on, the voltage is changed from the high potential (H) to the low potential (L). The input terminal changes to.

The IMD is an input terminal connected to the high potential side terminal of the forward switch contact 25 via a voltage dividing resistor 39. In this case, when the forward rotation switch contact 25 is turned on, the voltage of the input terminal IMD changes from a high potential to a low potential.
The IMU is an input terminal connected to the high potential side terminal of the reverse switch contact 26 via a voltage dividing resistor 39. In this case, when the reverse switch contact 26 is turned on, the voltage of the input terminal IMU changes from a high potential to a low potential.

Next, ID is an input terminal connected to the terminal voltage input line LI1 via the voltage dividing resistor 37 and to the ground line LG via the pull-down resistor 36, and the low potential side terminal voltage of the relay coil 2a. Is an input terminal to which a signal voltage (Vdn) corresponding to is input.
IU is an input terminal connected to the terminal voltage input line LI2 through the voltage dividing resistor 37 and connected to the ground line LG through the pull-down resistor 36, and is connected to the low potential side terminal voltage of the relay coil 3a. This is an input terminal to which a corresponding signal voltage (Vup) is input.
Here, the terminal voltage input line LI1 is a circuit conductor having one end connected to the low potential side terminal of the relay coil 2a and the other end connected to the input terminal ID via the voltage dividing resistor 37.
The terminal voltage input line LI2 is a circuit conductor having one end connected to the low potential side terminal of the relay coil 3a and the other end connected to the input terminal IU via the voltage dividing resistor 37.

IB is an input terminal connected to the power supply line L1 via the voltage dividing resistor 41 and connected to the ground line LG via the pull-down resistor 40, and a signal voltage (VBAT) corresponding to the battery voltage is input. Input terminal.
The terminal voltage input line LI1, the pull-down resistor 36, and the voltage dividing resistor 37, the pull-down resistor 40, and the voltage dividing resistor 41 connected to the input terminal ID constitute the normal rotation coil voltage detecting means of the present invention. . Further, the terminal voltage input line LI2, the pull-down resistor 36, and the voltage dividing resistor 37, the pull-down resistor 40, and the voltage dividing resistor 41 connected to the input terminal IU constitute the reverse coil voltage detecting means of the present invention. .

OD1 is connected to the base terminal of the transistor 28 via the voltage dividing resistor 33. When the output voltage becomes high, the transistors 28 and 21 are turned on, and when the output voltage becomes low, the transistors 28 and 21 are turned on. This is an output terminal that turns off.
OD2 is connected to the base terminal of the transistor 23 via the voltage dividing resistor 35. The output that turns on the transistor 23 when the output voltage becomes high and turns off the transistor 23 when the output voltage becomes low. Terminal.

OU1 is connected to the base terminal of the transistor 29 via the voltage dividing resistor 33, and turns on the transistors 29 and 22 when the output voltage becomes high and the transistors 29 and 22 when the output voltage becomes low. This is an output terminal that turns off.
OU2 is connected to the base terminal of the transistor 24 via the voltage dividing resistor 35. The output OU2 turns on the transistor 24 when the output voltage becomes high and turns off the transistor 24 when the output voltage becomes low. Terminal.

The control processing circuit 50 has the function of executing the following normal control by changing the output voltages of the output terminals OD1, OD2, OU1, and OU2 depending on the states of the input terminals IA, IMD, and IMU.
That is, when the operation unit is in a non-operation state (the voltages of the input terminals IA, IMD, and IMU are in a high potential state), all the energization switching elements (transistors 21 to 24 (TR1 to TR4)) are maintained in the off state. When the operation unit is in an operation state in which a manual operation in the normal direction of the motor is commanded (only the voltage of the IMD is in a low potential state), the transistors 21 and 23 are turned on, and the operation unit is in the reverse direction of the motor 1. In the operation state in which the manual operation is instructed (only the voltage of the IMU is in a low potential state), the transistors 22 and 24 are turned on to realize the manual operation in each direction.

Further, when the operation unit enters an operation state in which the motor 1 is instructed to perform an automatic operation in the normal rotation direction (IMD and IA voltages are in a low potential state), a predetermined normal rotation direction auto operation end timing (when the window is fully opened) Until the transistors 21 and 23 are kept in the ON state and the operation unit commands the automatic operation in the reverse direction of the motor 1 (IMU and IA voltages are in a low potential state), the predetermined reverse direction The transistors 22 and 24 are maintained in the ON state until the auto operation end timing (when the window is fully closed), thereby realizing the auto operation in each direction.
In the case of this example, the above normal control is executed only in a normal state in which a failure state (a submerged failure state or a circuit failure state) is not detected.

  When the submergence failure state is detected by a self-diagnosis function described later (when a submergence flag described later is turned on), the control processing circuit 50 can operate only the motor operation in the forward rotation direction (window opening direction). The following control is executed instead of the normal control. In other words, in this operation direction restricted state, all the energization switching elements are maintained in the OFF state unless the operation unit commands the operation in the normal rotation direction (the IMD voltage is in a low potential state). When the control unit is in the operation state in which the manual operation in the normal rotation direction is commanded (only the voltage of the IMD is in a low potential state), the transistors 21 and 23 are turned on to realize the manual operation in the normal rotation direction. When the operation state in which the auto operation in the normal rotation direction 1 is commanded (the IMD and IA voltages are in a low potential state), the transistors 21 and 23 are kept on until the predetermined auto rotation direction end timing. Thus, auto operation in the forward rotation direction is realized.

  In the case of this example, in a state where a circuit failure state is detected by a self-diagnosis function described later (a state where an UP output circuit failure flag or a DOWN output circuit failure flag described later is on), for example, the normal control is not executed, Under the control of the control processing circuit 50, all the energization switching elements are maintained in the OFF state regardless of the operation state, and the operation in any direction is prohibited, and an alarm for the user or the like is output. This alarm notifies a user or the like that there is a circuit failure state by sound or light, or display of characters or graphics. A similar alarm may be output when a submerged failure state is detected.

Further, the control processing circuit 50 determines whether or not the operation unit is in a non-operation state (except during the automatic operation), for example, at a constant cycle. A self-diagnosis function for executing the processing routine (high potential side failure determination processing and diagnosis processing) shown in FIG. Hereinafter, this processing routine will be described with reference to the flowcharts of FIGS.
When the processing routine is started, as shown in FIG. 2, first, in step S0, a high potential side failure determination process is executed.
This high-potential-side failure determination process includes a series of processes as shown in FIG. That is, first, in step S21, the timer for which a predetermined time is set as standby is started, and the process proceeds to step S22 after waiting for the timer to expire.

Next, in step S22, the voltages (VBAT, Vup) of the input terminals IB and IU are read, and whether or not the low potential side terminal voltage (Vup) of the relay coil 3a is substantially equal to the high potential side voltage (VBAT) of the power source, that is, Then, it is determined whether or not the low potential side terminal voltage (Vup) of the relay coil 3a is equal to the power supply voltage (VBAT) in consideration of a required error and margin. If so, the process proceeds to step S25.
Then, when proceeding to step S23, it is determined that a high potential side circuit failure state on the reverse side of the relay coil 3a has been detected, the UP output high potential side circuit failure flag is turned on, and in the next step S24, this high potential is detected. A record (diagram data) indicating that a side circuit failure state has been detected is stored, for example, in a memory in the control processing circuit 50.

Next, in step S25, the voltages (VBAT, Vdn) of the input terminals IB, ID are read, and whether the low potential side terminal voltage (Vdn) of the relay coil 2a is substantially equal to the high potential side voltage (VBAT) of the power source, That is, it is determined whether or not the low potential side terminal voltage (Vdn) of the relay coil 2a is equal to the power supply voltage (VBAT) in consideration of required errors and margins. If it is correct, return and proceed to step S1.
Then, when proceeding to step S26, it is determined that the high potential side circuit failure state on the relay coil 2a side in the normal rotation direction has been detected, and the DOWN output high potential side circuit failure flag is turned on. A record (diagram data) indicating that a potential side circuit failure state has been detected is stored in, for example, a memory in the control processing circuit 50.
After step S27, the process returns and proceeds to step S1.

When the above-described high potential side failure determination processing is completed, first, in step S1 (FIG. 2), the high potential side transistors 21 and 22 are turned on (output terminals OD1 and OU1 are turned on).
Next, in step S2, in order to wait for the terminal voltages of the relay coils 2a and 3a to become stable, the timer for which a predetermined time is set is started, and after waiting for this timer to expire, the process proceeds to step S3. move on.

In step S3, the voltages (VBAT, Vup) of the input terminals IB, IU are read, and whether the low potential side terminal voltage (Vup) of the relay coil 3a is equal to or lower than the relay operation low potential side voltage (Von = VBAT-VRY). In other words, it is determined whether or not the voltage (VBAT-Vup) between the terminals of the relay coil 3a is equal to or higher than the relay operating voltage (VRY). Proceed to S5.
Next, in step S5, the voltages (VBAT, Vdn) of the input terminals IB and ID are read, and whether or not the low potential side terminal voltage (Vdn) of the relay coil 2a is equal to or lower than the relay operation low potential side voltage (Von). That is, it is determined whether the voltage (VBAT-Vdn) between the terminals of the relay coil 2a is equal to or higher than the relay operating voltage (VRY). If the determination is affirmative, the process proceeds to step S6. .

In step S4, the Vup flag is turned on and the process proceeds to step S5. In step S6, the Vdn flag is turned on and the process proceeds to step S7.
Next, in step S7, it is determined whether both the Vup flag and the Vdn flag are on. If the determination is affirmative, the process proceeds to step S10. If the determination is negative, the process proceeds to step S8.
In step S8, it is determined whether the Vup flag is on and the Vdn flag is off. If the determination is affirmative, the process proceeds to step S12. If the determination is negative, the process proceeds to step S9.
In step S9, it is determined whether the Vup flag is off and the Vdn flag is on. If the determination is affirmative, the process proceeds to step S14. If the determination is negative, the process proceeds to step S16.

Then, when proceeding to step S10, it is determined that a submergence failure state has been detected, the submergence flag is turned on, and a record (diagram data) indicating that the submergence failure state has been detected in the next step S11 is controlled, for example. The data is stored in a memory in the processing circuit 50.
In step S12, it is determined that the low potential side circuit failure state on the reverse side of the relay coil 3a has been detected, and the UP output low potential side circuit failure flag is turned on. In the next step S13, the low potential side circuit failure flag is turned on. A record (diagram data) indicating that a side circuit failure state has been detected is stored, for example, in a memory in the control processing circuit 50.

Further, when proceeding to step S14, it is determined that the low potential side circuit failure state on the relay coil 2a side in the normal rotation direction has been detected, and the DOWN output low potential side circuit failure flag is turned on. A record (diagram data) indicating that a potential side circuit failure state has been detected is stored in, for example, a memory in the control processing circuit 50.
Here, the diagnosis data is recorded information in the vehicle controller (mainly information indicating the occurrence status of errors, etc.) that can be accessed and checked by an operator for grasping the vehicle status at a vehicle maintenance factory or the like. ). In the present invention, it goes without saying that leaving such a record is not necessarily an essential requirement. Further, such a record may be left for the circuit failure state, and such a record may not be left for the submerged failure state.

After steps S11, S13, and S15, the process proceeds to step S16. In step S16, the transistors 21 and 22 on the high potential side (upstream side) are returned to the off state (the output terminals OD1 and OU1 are returned to the off state). After step S16, one sequence of diagnostic processing is terminated and the process returns to the parent routine.
The Vup flag and the Vdn flag are initialized, for example, at the first or last step (not shown) of the processing routine shown in FIG. In addition, each flag indicating a failure state (submergence flag, UP output high potential side circuit failure flag, DOWN output high potential side circuit failure flag, UP output low potential side circuit failure flag, DOWN output low potential side circuit failure flag) For example, the operator in the repair shop is manually initialized to the off state by performing a special operation.

  In the drive device of this example configured as described above, switching elements (transistors 21, 22, 23, 24) for energization are provided on both sides of each relay coil 2a, 3a. That is, all the switching elements are maintained in the OFF state (except during the diagnosis process and during the auto operation), and basically one relay coil corresponding to the operation direction (except for the operation direction restriction state) is operated during operation. By turning on only the energization switching elements on both sides, only a predetermined relay coil is reliably driven. For this reason, at the time of non-operation, the both ends of each relay coil are basically maintained in a state of being disconnected from the energization line (each relay is in an off state), and the motor 1 can be prevented from operating arbitrarily even when submerged. Basically, even in the case of submergence, the operation in both directions according to the operation is reliably realized. In addition, if the motor coil terminal is in a non-operating state when submerged, both of the potentials of the motor coil terminals can be stably maintained at the ground potential, so that the above-described problems of firing due to electrolytic corrosion and leakage and malfunction of peripheral circuits can be solved.

  In addition, according to the present apparatus, the diagnosis process (steps S1 to S16) executed when the diagnosis condition is satisfied can provide a state where there is a high possibility of malfunction due to submersion (submergence failure state) without providing a submergence detection unit. It can be detected accurately and inexpensively with a simple configuration. The diagnostic process reads the voltage between the terminals of the relay coils 2a and 3a when only the switching elements on the high potential side are turned on, and the submerged failure state when both the terminal voltages are equal to or higher than the relay operating voltage. It is to be judged. For this reason, if a leak that causes the relay to malfunction occurs on the low potential side of each of the relay coils 2a and 3a, it is determined that the submerged failure state is caused by this diagnosis process. When submerged, it is unlikely that leakage will occur only on one side of the relay coils 2a and 3a except in the initial stage of submergence, and leakage on the low potential side of the relay coils 2a and 3a is likely to cause malfunction. The submerged failure state is more accurately determined by the diagnostic process.

Further, in this example, when the control processing circuit 50 determines that it is a submerged failure state in the diagnostic processing, it becomes an operation direction restriction state in which only the motor operation in a predetermined specified direction (window opening direction) can be operated. In this operation direction restricted state, all the energization switching elements are maintained in the OFF state unless the operation unit is in the operation state instructed to operate in the specified direction of the motor.
For this reason, in the submerged failure state, while the motor operation in the specified direction is possible, all the motor operations other than the specified direction operation are surely prohibited, and in addition to the arbitrary operation of the motor 1, the direction other than the specified direction (window Inadvertent motor operation in the closing direction) can be prevented.

Further, in this example, when the control processing circuit 50 determines that any one of the inter-terminal voltages of the relay coils 2a and 3a is equal to or higher than the relay operating voltage in the diagnosis processing, the low potential side circuit failure as described above. Judged to be in a state.
For this reason, in addition to the submerged failure state, the low-potential side circuit failure state can be accurately and inexpensively detected by the diagnosis process.

Further, in this example, the control processing circuit 50 turns off all coil switching elements (controls them to the off state), reads each coil terminal voltage, and any terminal voltage is the high potential side voltage of the power supply. If this is the case, a high potential side failure determination process (step S0; steps S21 to S27) for determining that a high potential side circuit failure state has occurred is executed immediately before the diagnosis process.
For this reason, in addition to the submerged failure state and the low potential side circuit failure state, the high potential side circuit failure state can be accurately and inexpensively detected.

The present invention is not limited to the above-described embodiments, and various modifications and applications are possible.
For example, a vehicle sunroof or power seat drive device can be realized with the same circuit configuration, and the same effect can be achieved.
The present invention can also be applied to a drive device that does not have an automatic operation function.
Further, the mode of the switch contact output signal and the transistor drive signal (active low or active high) is not limited to the above embodiment, and can be appropriately changed in design.
Further, for example, in the above-described embodiment, the control processing circuit 50 may further execute the following circuit failure diagnosis processing. That is, when a control signal is output to energize one of the relay coils to operate the motor, the voltage between the terminals of the corresponding relay coil is read, and the voltage between the terminals is equal to or higher than the relay operating voltage. If not, a process for determining that some circuit failure (for example, a circuit failure in which the transistor does not normally turn on) has occurred may be added.
Further, the high potential side failure determination processing may be executed after, for example, the diagnosis processing (detection processing such as submergence failure) (for example, immediately after step S16 in FIG. 2).

It is a figure which shows the principal circuit structure of a drive device. It is a flowchart which shows the diagnostic process etc. of a drive device. It is a flowchart which shows the high potential side failure judgment process of a drive device. It is a circuit diagram which shows the conventional drive device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor 2 Forward rotation relay 3 Reverse rotation relay 2a Forward rotation relay coil 3a Reverse rotation relay coil 21 Transistor (High-potential side switching element for forward rotation)
22 Transistor (High-potential side switching element for reverse rotation)
23 Transistor (Low-potential side switching element for normal rotation)
24 transistor (low potential side switching element for reverse rotation)
50 Control processing circuit (control means)
LI1 terminal voltage input line (coil voltage detection means for forward rotation)
LI2 terminal voltage input line (reverse coil voltage detection means)

Claims (4)

According to the operating state of the operation unit for commanding the operation in the normal rotation direction or the reverse rotation direction of the motor, the motor has a normal rotation relay and a reverse rotation relay to supply power to the motor to rotate the motor in the normal rotation or reverse rotation, respectively. A driving device that operates one of the relays to drive the motor in the forward direction or the reverse direction,
A high-potential side switching element for normal rotation that opens and closes between the high-potential side terminal of the coil of the forward-rotation relay and the high-potential side of the power source;
A high potential side switching element for reverse rotation that opens and closes between a high potential side terminal of the coil of the reverse relay and a high potential side of the power source;
A forward-rotating low-potential side switching element that opens and closes between a low-potential-side terminal of the coil of the forward-rotating relay and the ground side;
A low potential side switching element for reverse rotation that opens and closes between a low potential side terminal of the coil of the reverse relay and the ground side;
A forward coil voltage detecting means for detecting a voltage between terminals of the coil of the forward relay;
A reverse coil voltage detecting means for detecting a voltage between terminals of the coil of the reverse relay;
A control unit having a function of executing a diagnosis process when a predetermined diagnosis condition is satisfied, and a function of executing a normal control at least in a normal state;
In the normal control, when the operation unit is in a non-operating state, the high-potential switching element for normal rotation, the low-potential switching element for normal rotation, the high-potential switching element for reverse rotation, and the low-potential switching element for reverse rotation are turned off. When the operation unit is in an operation state instructed to operate in the normal rotation direction of the motor, the normal rotation high potential side switching element and the normal rotation low potential side switching element are turned on, and the motor is normally rotated. When the operation unit is in an operation state instructing an operation in the reverse direction of the motor, the reverse high potential side switching element and the reverse low potential side switching element are turned on to reverse the motor,
The diagnosis processing is performed by turning on the forward high potential side switching element and the reverse high potential side switching element, and detecting the voltages between the terminals detected by the forward rotation coil voltage detection means and the reverse rotation coil voltage detection means. When both the forward rotation side voltage detected by the forward rotation coil voltage detection means and the reverse rotation side terminal voltage detected by the reverse rotation coil voltage detection means are equal to or higher than the relay operating voltage, A drive device characterized by being determined to be in a submerged failure state. When the control means determines that it is a submerged failure state in the diagnostic process, the control means enters an operation direction restricted state in which only the motor operation in a predetermined specified direction can be operated. The forward high potential side switching element, the normal rotation low potential side switching element, the reverse rotation high potential side switching element, and the reverse rotation low potential side switching element are turned off unless the operation state commanding the operation in the specified direction of the motor is entered. 2. The driving device according to claim 1, wherein the driving device is maintained in a state. In the diagnosis process, the control means determines that a low-potential side circuit failure state occurs when one of the forward-side terminal voltage and the reverse-side terminal voltage is equal to or higher than the relay operating voltage. The drive device according to claim 1, wherein: The control means turns off the forward rotation high-potential side switching element, the forward rotation low-potential side switching element, the reverse rotation high-potential side switching element, and the reverse rotation low-potential side switching element. Reads the terminal voltage of the relay coil, and if any terminal voltage is the high potential side voltage of the power supply, the high potential side failure judgment processing for judging that there is a high potential side circuit fault state The drive device according to claim 1, wherein the drive device has a function to be executed when it is established.

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