JP4555277B2 - Duty solenoid device - Google Patents

Description

  The present invention relates to a duty solenoid device that detects disconnection and short circuit of a duty solenoid.

For example, in an automatic transmission of an automobile, a speed change mechanism is operated by duty driving a duty solenoid (hereinafter abbreviated as “solenoid”) to perform a speed change operation. Therefore, when an abnormality such as a disconnection or a short circuit occurs in the solenoid, an influence on the running performance of the automobile occurs immediately.
Therefore, it is necessary to quickly detect both disconnection and short circuit of the solenoid.

To detect the disconnection and short circuit of the solenoid, the duty signal of the solenoid (including the energization instruction signal and the non-energization instruction signal) input to the solenoid drive circuit and whether the solenoid is actually energized What is necessary is just to compare.
That is, when the energization instruction signal is output to the solenoid but the solenoid is not energized, it is determined that the solenoid is disconnected. Further, when the solenoid is energized even though the non-energization instruction signal is output to the solenoid, it is determined that the solenoid is short-circuited.

  Further, as described above, since it is necessary to quickly detect any disconnection or short circuit of the solenoid, after the duty signal is switched from the energization instruction signal to the non-energization instruction signal, or the duty signal is applied to the solenoid. It is necessary to detect disconnection and short circuit of the solenoid immediately after switching from the non-energization instruction signal to the energization instruction signal.

However, the delay time of the drive circuit is included between the time when the duty signal is input to the solenoid drive circuit and the time when the drive circuit responds and the drive voltage is applied to the solenoid.
Therefore, for example, immediately after the duty signal is switched from the non-energization instruction signal to the energization instruction signal, there is a problem that it is erroneously determined that the solenoid is disconnected even though the solenoid is normal.

  Therefore, the conventional linear solenoid drive device does not detect a disconnection or a short circuit of the solenoid for a certain period of time after switching the duty signal in order to prevent the erroneous determination immediately after switching the duty signal and solve the above problem. A mask time is provided (see, for example, Patent Document 1).

Hereinafter, with reference to the flowchart of FIG. 6, a detection process in which the conventional device described in Patent Document 1 detects a disconnection and a short circuit of the solenoid will be described.
In FIG. 6, first, it is determined whether or not the duty signal has risen (switched) from an OFF state indicating a non-energization instruction signal to the solenoid to an ON state indicating an energization instruction signal to the solenoid (step S51).

If it is determined in step S51 that the duty signal has risen to the ON state (ie, Yes), a timer for measuring the mask time is started (step S52).
On the other hand, if it is determined in step S51 that the duty signal has not risen to the ON state (ie, No), the process returns to step S51 to determine again whether the duty signal has risen to the ON state.

Subsequently, it is determined whether or not the mask time has elapsed (step S53).
If it is determined in step S53 that the mask time has elapsed (that is, Yes), the drive voltage applied to the solenoid is acquired (step S54).
On the other hand, if it is determined in step S53 that the mask time has not elapsed (that is, No), the process returns to step S53 to determine again whether the mask time has elapsed.

  Next, the duty signal is compared with the drive voltage (step S55), and the disconnection determination of the solenoid is executed. If the solenoid is energized, it is determined to be normal, and if the solenoid is not energized, it is determined to be disconnected ( Step S56).

Subsequently, it is determined whether the duty signal has fallen (switched) from the ON state to the OFF state (step S57).
If it is determined in step S57 that the duty signal has fallen to the OFF state (ie, Yes), a timer for measuring the mask time is started (step S58).
On the other hand, if it is determined in step S57 that the duty signal has not fallen to the OFF state (that is, No), the process returns to step S57 to determine again whether the duty signal has fallen to the OFF state.

Next, it is determined whether or not the mask time has elapsed (step S59).
If it is determined in step S59 that the mask time has elapsed (that is, Yes), the drive voltage applied to the solenoid is acquired (step S60).
On the other hand, if it is determined in step S59 that the mask time has not elapsed (that is, No), the process returns to step S59 to determine again whether the mask time has elapsed.

  Subsequently, the duty signal is compared with the drive voltage (step S61), and the solenoid short-circuit determination is executed. (Step S62), the process of FIG. 6 is terminated.

Hereinafter, the detection process of the conventional apparatus shown in the flowchart of FIG. 6 will be supplementarily described with reference to the timing chart of FIG.
In FIG. 7, first, at time t51 when the duty signal rises from the OFF state to the ON state, a timer for measuring the mask time is started.

Further, at time t52 when the delay time of the drive circuit has elapsed from time t51, the solenoid is energized and a predetermined voltage Vs is applied. Here, when the solenoid is disconnected, the solenoid is in a non-energized state, and the voltage remains at 0 V (see the broken line).
Subsequently, at time t53 when the mask time has elapsed from time t51, the drive voltage applied to the solenoid is detected, and disconnection determination of the solenoid is executed.

Next, at time t54 when the duty signal falls from the ON state to the OFF state, a timer for measuring the mask time is started.
Further, at time t55 when the delay time of the drive circuit has elapsed from time t54, the solenoid is de-energized and the voltage becomes 0V. Here, when the solenoid is short-circuited, the solenoid is energized and the voltage Vs (see the broken line) remains applied.
Subsequently, at time t56 when the mask time has elapsed from time t54, the drive voltage applied to the solenoid is detected, and a solenoid short-circuit determination is performed.

That is, in the above-described conventional device, after the duty signal is switched to the ON state and the mask time has elapsed, it is determined that the solenoid is normal if it is energized, and is disconnected if the solenoid is not energized. Further, after the duty signal is switched to the OFF state and the mask time has elapsed, if the solenoid is energized, it is determined as a short circuit, and if the solenoid is not energized, it is determined as normal.
Therefore, in order to detect both disconnection and short circuit of the solenoid, the drive voltage of the solenoid is detected in both cases where the duty signal is ON and OFF, and disconnection determination and short circuit determination are executed. There is a need to.

JP 2004-247367 A

In the conventional linear solenoid device, an erroneous determination immediately after switching of the duty signal is prevented by providing a mask time during which a disconnection and a short circuit of the solenoid are not detected for a certain period of time after switching of the duty signal.
However, a microcomputer that can detect both the rising edge when the duty signal rises from the OFF state to the ON state and the falling edge when the duty signal falls from the ON state to the OFF state ( (Hereinafter, abbreviated as “microcomputer”), there is a problem that the cost increases as the functionality of the microcomputer increases.

  In addition, since it is necessary to start a timer for measuring the mask time at both the rising edge and the falling edge of the duty signal, the timer starting interrupt processing is performed in one cycle (from the rising edge to the next rising edge). 2 times for each of the duty signal waveforms (up to), the program processing becomes complicated and the load on the microcomputer becomes high. For this reason, a microcomputer having a high processing speed is required, and the cost is further increased.

  An object of the present invention is to solve the above-described problems, and an object of the present invention is to reduce a cost and to detect a duty solenoid device that can detect both disconnection and short-circuit of the solenoid. It is to provide.

In the duty solenoid device according to the present invention, the duty solenoid that is duty-driven, the energization time corresponding to the energization state of the duty solenoid, and the non-energization time corresponding to the non-energization state of the duty solenoid are combined with the duty solenoid. A duty signal generating means for outputting a duty signal with a period of one cycle, a solenoid driving means for outputting a drive signal for driving the duty solenoid based on the duty signal, and a drive voltage applied to the duty solenoid. a voltage detecting means for outputting a voltage detection signal, compares the duty signal and the voltage detection signal, compares the comparison diagnosis means for detecting disconnection and short circuit of the duty solenoid based on the result, the duty signal is not energized duty solenoid From state to power Timer switching means that detects a switching timing that has been switched, starts a timer that is set with a second predetermined time obtained by adding the first predetermined time and the energization time when the switching timing is detected, and a first predetermined time based on the switching timing. Timer time measuring means for outputting a first timing signal to the comparative diagnostic means after a lapse of time and outputting a second timing signal to the comparative diagnostic means after a second predetermined time has elapsed from the switching timing. The comparison diagnostic means determines whether the duty solenoid is disconnected in response to the first timing signal, and determines whether the duty solenoid is short-circuited in response to the second timing signal. This is a judgment.

According to the duty solenoid device of the present invention, the comparison diagnosis means determines whether the solenoid is disconnected after the first predetermined time has elapsed from the switching timing when the duty signal is switched from the non-energized state of the solenoid (duty solenoid) to the energized state. After the second predetermined time obtained by adding the solenoid energization time to the first predetermined time has elapsed from the switching timing described above, the solenoid short-circuit determination is executed.
As a result, only one of the rising edge and falling edge of the duty signal can be detected to detect both disconnection and short-circuit of the solenoid, thus eliminating the need for a highly functional microcomputer and reducing costs. be able to.
In addition, the interrupt processing for starting the timer is performed once per duty signal waveform in one cycle (the time from the rising edge to the next rising edge, that is, the time including the energization time and the non-energization time), and the program processing is performed. Since it becomes easy and the load of the microcomputer is reduced, a microcomputer having a high processing speed is not required, and the cost can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding members and parts will be described with the same reference numerals.

Embodiment 1 FIG.
1 is a schematic configuration diagram showing a duty solenoid device according to Embodiment 1 of the present invention.
In FIG. 1, the duty solenoid device includes a duty-driven solenoid 1 (duty solenoid), a solenoid drive device 2 that drives the solenoid 1, and a notification device 3 that notifies the abnormality of the solenoid 1 to the outside. .
Here, the notification device 3 includes a display (not shown), a speaker (not shown), and the like, and notifies the abnormality of the solenoid 1 by display on the display and sound output by the speaker.

  The solenoid driving device 2 outputs a duty signal (described later) to control the driving of the solenoid 1, and a solenoid that outputs a driving signal for driving the solenoid 1 based on the duty signal. A drive circuit 5 (solenoid drive means) and a voltage detection circuit 6 (voltage detection means) for detecting a drive voltage applied to the solenoid 1 and outputting a voltage detection signal are provided.

The microcomputer 4 includes a duty signal generation unit 7 (duty signal generation means), a voltage detection unit 8, a timer starter 9, a timer time measurement unit 10, and a comparative diagnosis unit 11 (comparison diagnosis unit). Yes.
Here, the microcomputer 4 is constituted by a microprocessor (not shown) having a memory storing a program and a CPU, and each block constituting the microcomputer 4 is stored as software in the memory.

The duty signal generator 7 generates a duty signal for the solenoid 1, and outputs the duty signal to the solenoid drive circuit 5, the timer starter 9, and the comparative diagnosis unit 11.
Here, the duty signal corresponds to the energization time corresponding to the energization state of the solenoid 1 (the time during which the ON state of the duty signal continues, hereinafter referred to as “duty ON time”) and the non-energization state corresponding to the non-energization state of the solenoid 1. A period including the energization time (the time during which the OFF state of the duty signal continues, hereinafter referred to as “duty OFF time”) is defined as one cycle.

In addition, the duty signal generation unit 7 is set with a drive cycle of the solenoid 1 and a duty ON time ratio or a duty OFF time ratio from the outside. The duty signal generation unit 7 sets the duty cycle to the duty cycle of the solenoid 1. A duty signal is generated by multiplying the ratio of the ON time (duty OFF time).
That is, when the duty signal is generated, the duty ON time and the duty OFF time are clearly calculated. Further, even when the drive cycle of the solenoid 1 is changed, the duty ON time and the duty OFF time are clearly calculated based on the ratio of the duty ON time.
It should be noted that the duty ON time and the duty OFF time may be set directly in the duty signal generation unit 7.

The voltage detection unit 8 receives the voltage detection signal from the voltage detection circuit 6 and outputs the received voltage detection signal to the comparative diagnosis unit 11.
When the duty signal rises from the OFF state to the ON state, the timer starting unit 9 starts a timer (not shown) and outputs a start notification signal to the timer time measuring unit 10. At this time, the timer is set to a second predetermined time obtained by adding a mask time (first predetermined time) for preventing an erroneous determination immediately after switching of the duty signal and the duty ON time. The mask time is set based on the delay of the solenoid drive circuit 5.

  The timer time measuring unit 10 measures the time set in the timer, and outputs the first timing signal to the comparative diagnosis unit 11 after the mask time has elapsed from the switching timing when the duty signal rises to the ON state and the timer is started. In addition, after the second predetermined time has elapsed from the switching timing at which the timer is started, the second timing signal is output to the comparative diagnosis unit 11.

  The comparison diagnosis unit 11 compares the duty signal and the voltage detection signal in response to the first timing signal from the timer time measurement unit 10 and determines whether or not the solenoid 1 is disconnected. Further, the comparative diagnosis unit 11 compares the duty signal and the voltage detection signal in response to the second timing signal from the timer time measuring unit 10 and determines whether or not the solenoid 1 is short-circuited. Further, the comparative diagnosis unit 11 outputs the determination result of the disconnection determination and the short circuit determination of the solenoid 1 to the notification device 3.

Hereinafter, a detection process in which the duty solenoid device according to the first embodiment of the present invention detects disconnection and short circuit of the solenoid 1 will be described with reference to the flowchart of FIG. 2 together with FIG.
In FIG. 2, first, the timer starting unit 9 determines whether or not the duty signal has risen from the OFF state to the ON state (switched) (step S31).

If it is determined in step S31 that the duty signal has risen to the ON state (that is, Yes), the timer activation unit 9 activates a timer set with a second predetermined time obtained by adding the mask time and the duty ON time. (Step S32).
On the other hand, if it is determined in step S31 that the duty signal has not risen to the ON state (that is, No), the process returns to step S31 to determine again whether the duty signal has risen to the ON state.

Subsequently, the timer time measuring unit 10 determines whether or not the mask time has elapsed (step S33).
If it is determined in step S33 that the mask time has elapsed (that is, Yes), the timer time measuring unit 10 outputs the first timing signal to the comparative diagnosis unit 11 (step S34).
On the other hand, if it is determined in step S33 that the mask time has not elapsed (that is, No), the process returns to step S33 to determine again whether the mask time has elapsed.

  Next, the comparison diagnosis unit 11 compares the duty signal and the voltage detection signal (step S35), performs disconnection determination of the solenoid 1, determines that the solenoid 1 is energized, determines that the solenoid 1 is normal, and the solenoid 1 If it is not energized, it is determined as a disconnection (step S36).

Subsequently, the timer time measuring unit 10 determines whether or not the second predetermined time has elapsed (step S37).
If it is determined in step S37 that the second predetermined time has elapsed (that is, Yes), the timer time measuring unit 10 outputs a second timing signal to the comparative diagnosis unit 11 (step S38).
On the other hand, if it is determined in step S37 that the second predetermined time has not elapsed (ie, No), the process returns to step S37 to determine again whether the second predetermined time has elapsed.

Next, the comparison diagnosis unit 11 compares the duty signal and the voltage detection signal (step S39), performs a short-circuit determination of the solenoid 1, and determines that the solenoid 1 is short-circuited if the solenoid 1 is energized. If it is not energized, it is determined to be normal (step S40), and the process of FIG.
Note that when the timer starter 9 detects the rising of the duty signal again, the disconnection determination and the short circuit determination of the solenoid 1 are repeatedly executed.

Hereinafter, the detection processing of the duty solenoid device shown in the flowchart of FIG. 2 will be supplementarily described with reference to the timing chart of FIG.
In FIG. 3, first, at time t1 when the duty signal rises from the OFF state to the ON state, the timer activation unit 9 activates a timer in which a second predetermined time obtained by adding the mask time and the duty ON time is set.

Further, at time t2 when the delay time of the solenoid drive circuit 5 has elapsed from time t1, the solenoid 1 is energized and a predetermined voltage Vs is applied. Here, when the solenoid 1 is disconnected, the solenoid 1 is in a non-energized state and the voltage remains at 0 V (see the broken line).
Subsequently, at time t3 when the mask time has elapsed from time t1, the timer time measurement unit 10 outputs the first timing signal to the comparison diagnosis unit 11, and the comparison diagnosis unit 11 compares the duty signal with the voltage detection signal. Then, the disconnection determination of the solenoid 1 is executed.

Next, at time t4 when the duty ON time has elapsed from time t1, the duty signal falls from the ON state to the OFF state.
Further, at time t5 when the delay time of the solenoid drive circuit 5 has elapsed from time t4, the solenoid 1 is in a non-energized state and the voltage becomes 0V. Here, when the solenoid 1 is short-circuited, the solenoid 1 is energized and the voltage Vs (see the broken line) remains applied.
Subsequently, at time t6 when the second predetermined time has elapsed from time t1 (duty ON time has elapsed from time t2), the timer time measuring unit 10 outputs the second timing signal to the comparative diagnosis unit 11 to perform comparative diagnosis. The unit 11 compares the duty signal with the voltage detection signal and performs a short circuit determination of the solenoid 1.

Hereinafter, the case where the duty solenoid device of the present embodiment is applied to an automobile will be specifically described.
In a vehicle transmission or the like, 4 to 5 solenoids 1 driven at several tens [Hz] to several hundreds [Hz] are used. For example, when five solenoids 1 each driven at 50 Hz are driven for 1 second, a duty signal waveform corresponding to 250 cycles (50 Hz × 5) is generated as a whole.

  Here, in the conventional device described in Patent Document 1, four interrupt processes are generated for one cycle of the duty signal waveform. The number of interrupt processes is two timer start processes at both the rising edge and the falling edge of the duty signal, and two detection processes for detecting disconnection and short circuit of the solenoid 1 after the mask time has elapsed from each edge. Is the sum of Therefore, 1000 times (250 cycles × 4 times) of interrupt processing occurs in the duty signal waveform for 250 cycles.

  On the other hand, in the duty solenoid device of the present embodiment, three interruption processes are generated for one cycle of the duty signal waveform. The number of interrupt processing is to detect the disconnection and short circuit of the solenoid 1 after the timer start processing at the rising edge of the duty signal, after the mask time has elapsed from the rising edge, and after the second predetermined time has elapsed from the rising edge. This is the total of two detection processes. Therefore, 750 times (250 cycles × 3 times) interrupt processing occurs in the duty signal waveform for 250 cycles.

  Therefore, the duty solenoid device according to the present embodiment can reduce the interrupt processing 250 times, that is, 25%, and reduce the load on the microcomputer 4 as compared with the conventional device described in Patent Document 1. Can do.

According to the duty solenoid device according to the first embodiment of the present invention, the comparison diagnosis unit 11 responds to the first timing signal from the timer time measurement unit 10 after the mask time has elapsed from the rising edge of the duty signal. The disconnection determination of the solenoid 1 is executed, and after the second predetermined time has elapsed from the rising edge of the duty signal, the short-circuit determination of the solenoid 1 is executed in response to the second timing signal from the timer time measuring unit 10.
Therefore, it is possible to detect both the disconnection and the short circuit of the solenoid 1 by detecting only the rising edge of the rising edge and the falling edge of the duty signal, so that a highly functional microcomputer 4 is not required and the cost is reduced. can do.
In addition, the interrupt processing for starting the timer is once per duty signal waveform in one cycle, the program processing becomes easy and the load on the microcomputer 4 is reduced, so the microcomputer 4 having a high processing speed is not required, Cost can be reduced.

Embodiment 2. FIG.
In the first embodiment, when the duty signal rises from the OFF state to the ON state, the timer activation unit 9 activates the timer, and is output from the timer time measurement unit 10 according to the elapsed time since the timer was activated. In response to the timing signal, the comparative diagnosis unit 11 executes disconnection determination and short circuit determination of the solenoid 1.
However, the present invention is not limited to this, and the timer activation unit 9 may activate the timer when the duty signal falls from the ON state to the OFF state.

  A duty solenoid device according to Embodiment 2 of the present invention is replaced with a timer activation unit 9A (not shown), a timer time instead of the timer activation unit 9, the timer time measurement unit 10 and the comparative diagnosis unit 11 shown in FIG. It has a measuring unit 10A (not shown) and a comparative diagnostic unit 11A (not shown).

  When the duty signal falls from the ON state to the OFF state, the timer activation unit 9A activates the timer and outputs an activation notification signal to the timer time measurement unit 10A. At this time, a third predetermined time obtained by adding a mask time (first predetermined time) and a duty OFF time for preventing erroneous determination immediately after switching of the duty signal is set in the timer. The mask time is set based on the delay of the solenoid drive circuit 5.

  The timer time measuring unit 10A measures the time set in the timer, and after the mask time has elapsed from the switching timing when the duty signal falls to the OFF state and the timer is started, the first timing signal is sent to the comparative diagnostic unit 11A. In addition, the third timing signal is output to the comparative diagnosis unit 11A after the third predetermined time has elapsed from the switching timing at which the timer is started.

The comparison diagnosis unit 11A compares the duty signal and the voltage detection signal in response to the first timing signal from the timer time measurement unit 10A, and determines that the solenoid 1 is short-circuited if the solenoid 1 is energized. If energized, it is determined as normal. Further, the comparison diagnosis unit 11A compares the duty signal and the voltage detection signal in response to the third timing signal from the timer time measurement unit 10A, and determines that the solenoid 1 is normal, and determines that the solenoid 1 is normal. If is not energized, it is determined as a disconnection.
Other configurations and the operation of the duty solenoid device according to the present embodiment are the same as those of the first embodiment described above, and thus the description thereof is omitted.

According to the duty solenoid device according to the second embodiment of the present invention, the comparative diagnosis unit 11A responds to the first timing signal from the timer time measuring unit 10A after the mask time has elapsed from the falling edge of the duty signal. The solenoid 1 is judged to be short-circuited, and after the third predetermined time has elapsed from the falling edge of the duty signal, the disconnection judgment of the solenoid 1 is executed in response to the third timing signal from the timer time measuring unit 10A. .
Therefore, the same effect as in the first embodiment can be obtained.

Embodiment 3 FIG.
4 is a schematic configuration diagram showing a duty solenoid device according to Embodiment 3 of the present invention.
In FIG. 4, the solenoid drive device 2B of the duty solenoid device includes a microcomputer 4B and a solenoid drive element 12 (solenoid drive means, voltage detection means) instead of the microcomputer 4, solenoid drive circuit 5 and voltage detection circuit 6 shown in FIG. ).
Further, the microcomputer 4B has a duty signal generation unit 7B, a signal detection unit 13 and a comparative diagnosis unit 11B instead of the duty signal generation unit 7, the voltage detection unit 8 and the comparison diagnosis unit 11 shown in FIG. .

The duty signal generation unit 7B generates a duty signal for the solenoid 1 and outputs the duty signal to the solenoid driving element 12, the timer starting unit 9, and the comparative diagnosis unit 11B.
Here, the duty signal generator 7B corresponds to “H” corresponding to the energized state of the solenoid 1 (duty signal ON state) and the non-energized state of the solenoid 1 (duty signal OFF state) as the duty signal. Two types of signals “L” are output.

The solenoid drive element 12 outputs a drive signal for driving the solenoid 1 based on the duty signal from the duty signal generator 7B, detects the drive state of the solenoid 1, and outputs a drive state signal.
Here, the solenoid driving element 12 outputs a “H” signal as a driving state signal if the solenoid 1 is energized, and outputs an “L” signal if the solenoid 1 is not energized.
The signal detection unit 13 receives the driving state signal from the solenoid driving element 12, and outputs the received driving state signal to the comparative diagnosis unit 11B.

In response to the first timing signal from the timer time measuring unit 10, the comparative diagnosis unit 11B compares the duty signal ("H" in this case) with the driving state signal, and the solenoid 1 is energized (the driving state signal is If it is “H”), it is determined to be normal, and if the solenoid 1 is not energized (the driving state signal is “L”), it is determined to be disconnected.
In addition, in response to the second timing signal from the timer time measuring unit 10, the comparative diagnosis unit 11B compares the duty signal ("L" in this case) with the driving state signal, and the solenoid 1 is energized (driving state). If the signal is “H”), it is determined as a short circuit, and if the solenoid 1 is not energized (the drive state signal is “L”), it is determined as normal.

In other words, the relationship between the duty signal and the driving state signal and the determination result of the disconnection determination and the short circuit determination of the solenoid 1 is as shown in FIG.
Other configurations and the operation of the duty solenoid device according to the present embodiment are the same as those of the first embodiment described above, and thus the description thereof is omitted.

According to the duty solenoid device according to the third embodiment of the present invention, the comparison diagnosis unit 11B responds to the first timing signal from the timer time measurement unit 10 after the mask time has elapsed from the rising edge of the duty signal. The disconnection determination of the solenoid 1 is executed, and after the second predetermined time has elapsed from the rising edge of the duty signal, the short-circuit determination of the solenoid 1 is executed in response to the second timing signal from the timer time measuring unit 10.
Therefore, the same effect as in the first embodiment can be obtained.

It is a schematic block diagram which shows the duty solenoid device which concerns on Embodiment 1 of this invention. It is a flowchart which shows operation | movement of the duty solenoid apparatus which concerns on Embodiment 1 of this invention. FIG. 3 is a timing chart for supplementarily explaining the operation of the duty solenoid device shown in the flowchart of FIG. 2. FIG. It is a schematic block diagram which shows the duty solenoid device which concerns on Embodiment 3 of this invention. It is explanatory drawing which shows the relationship between the duty signal by Embodiment 3 of this invention, and a drive condition signal, and the determination result of the disconnection determination of a solenoid, and the short circuit determination. It is a timing chart which shows the operation | movement by the conventional linear solenoid drive device. It is a timing chart which explains supplementarily the operation | movement by the conventional linear solenoid drive device.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Solenoid (duty solenoid), 5 Solenoid drive circuit (solenoid drive means), 6 Voltage detection circuit (voltage detection means), 7, 7B Duty signal generation part (duty signal generation means), 11, 11A, 11B Comparative diagnosis part ( Comparative diagnosis means), 12 Solenoid drive element (solenoid drive means, voltage detection means).

Claims (3)

A duty solenoid driven by a duty;
A duty signal that outputs a duty signal with a period that is a sum of the energization time corresponding to the energization state of the duty solenoid and the deenergization time corresponding to the non-energization state of the duty solenoid to the duty solenoid. Generating means;
Solenoid driving means for outputting a driving signal for driving the duty solenoid based on the duty signal;
Voltage detection means for detecting a drive voltage applied to the duty solenoid and outputting a voltage detection signal;
Comparison diagnostic means for comparing the duty signal and the voltage detection signal, and detecting disconnection and short circuit of the duty solenoid based on a comparison result ;
A switching timing at which the duty signal is switched from the non-energized state of the duty solenoid to the energized state is detected, and a second predetermined time is set by adding the first predetermined time and the energizing time when the switching timing is detected. Timer starting means for starting the timer,
After the first predetermined time has elapsed from the switching timing, a first timing signal is output to the comparison diagnostic means, and after the second predetermined time has elapsed from the switching timing, the comparison diagnostic means Timer time measuring means for outputting the second timing signal
The comparison diagnosis unit determines whether the duty solenoid is disconnected in response to the first timing signal, and determines whether the duty solenoid is short-circuited in response to the second timing signal. A duty solenoid device characterized by determining whether or not. A duty solenoid driven by a duty;
A duty signal that outputs a duty signal with a period that is a sum of the energization time corresponding to the energization state of the duty solenoid and the deenergization time corresponding to the non-energization state of the duty solenoid to the duty solenoid. Generating means;
Solenoid driving means for outputting a driving signal for driving the duty solenoid based on the duty signal;
Voltage detection means for detecting a drive voltage applied to the duty solenoid and outputting a voltage detection signal;
Comparison diagnostic means for comparing the duty signal and the voltage detection signal, and detecting disconnection and short circuit of the duty solenoid based on a comparison result ;
A switching timing at which the duty signal is switched from the energized state to the non-energized state of the duty solenoid is detected, and a third predetermined time is set by adding the first predetermined time and the non-energized time when the switching timing is detected. Timer starting means for starting
After the first predetermined time has elapsed from the switching timing, a first timing signal is output to the comparison diagnostic means, and after the third predetermined time has elapsed from the switching timing, to the comparison diagnostic means Timer time measuring means for outputting the third timing signal ,
The comparison diagnosis unit determines whether the duty solenoid is short-circuited in response to the first timing signal, and determines whether the duty solenoid is disconnected in response to the third timing signal. A duty solenoid device characterized by determining whether or not.   The duty solenoid device according to claim 1, wherein the first predetermined time is set based on a delay of the solenoid driving unit.

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