JPS61167786A - Solenoid driving device - Google Patents

Abstract

PURPOSE:To make the action of plural solenoids mounted on a front and rear sides smooth and quick by driving the rear solenoid in accordance with the detecting signal sent by a detecting means to detect a change in current passing through the front solenoid. CONSTITUTION:When an electric current 1 passes through a front solenoid 1, it flows in a current detecting resistance 19, and the voltage VB at the point B rises gradually, and the output terminal of a comparator 41 therefore changes from a high level voltage to a low level voltage. Designating a time elapsing until the output voltage of the comparator 41 reverses as t2, the front and rear solenoids 3 correctly begins stroke motion after time t2. Designating the movement of the movable iron cores of the front and rear solenoids 1, 3 as S1, S2 respectively,the above solenoids 3 are turned on or off corresponding to the on-off motion of the front solenoid 1 after t2 and t3 from its motion, its action is smooth, quick and accurate.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention is a solenoid driver that sequentially drives a plurality of solenoids! Regarding the II device.

[Conventional technology]

An example of a drive device that sequentially drives a plurality of solenoids is the drive device described in Japanese Unexamined Patent Publication No. 53-43230.

An example of such a solenoid drive device is shown in FIG. The front solenoid 1 is connected to a power source s5 via a front solenoid drive circuit 3, and the rear solenoid 7 is connected to a power source 5 via a rear solenoid drive circuit 9 and a delay circuit 11. The delay circuit 11 is composed of a timer, and sends the voltage from the power supply 5 over time to the subsequent solenoid drive circuit 9.
As a result, the rear stage solenoid 7 operates easily after the front stage solenoid operates.

FIGS. 4(a) to 4(') are time charts showing the operation of the solenoid drive device shown in FIG. 3.

In FIG. 4, (a) shows the voltage V+ applied to the front stage solenoid drive circuit 3, and FIG. 4(b) shows the voltage v2 applied to the rear stage solenoid drive circuit 9.

As shown in both figures (a) and (b), both cylinder pressures v1, ■
2 are provided at intervals of time 11 under the action of the delay circuit 11.

Figure 4 (C) shows the current ■1 flowing through the front solenoid 1,
FIG. 4(d) shows the operation (stroke S+) of the front stage solenoid 1. Further, FIG. 4(e) shows the current 2 flowing through the rear solenoid, and FIG. 4 ([) shows the operation (stroke S2) of the rear solenoid 7. In addition,
The current flowing through both solenoids 1 and 7 increases exponentially.

However, the solenoid drive device having the above configuration has a problem in that the delay time t1 must be sufficiently large in order to operate the plurality of solenoids sequentially and accurately.

The reason for this is that both solenoids must be operated in sequence without malfunction, taking into account variations in solenoid product accuracy and driving conditions such as ambient temperature.Also, taking into account deterioration of the solenoids over time, both solenoids must be operated in sequence. This is because it is necessary to avoid reversing the order of operations.

[Object of the Invention] It is an object of the present invention to provide a solenoid drive device that can solve the above-mentioned problems and operate a plurality of solenoids smoothly, quickly, and accurately in sequence.

[Summary of the invention]

In order to achieve the above object, the present invention provides a pre-stage solenoid driving means for driving a pre-stage solenoid, a pre-stage solenoid energization state detection means for detecting a change in the energization state of the pre-stage solenoid, and a pre-stage solenoid energization state detection means for detecting a change in the energization state of the pre-stage solenoid. A rear-stage solenoid driving means is provided for driving a rear-stage solenoid based on a detection signal.

[Explanation of Examples]

Hereinafter, the present invention will be described in detail with reference to examples.

FIG. 1 shows an embodiment of this invention.

This example has two stages of solenoids, that is, a front stage solenoid 1 and a rear stage solenoid 3, and these solenoids 1 are operated in sequence. Only the coil portion of the solenoid 1.3 is shown.

A series circuit of a surge absorbing diode 13 and a resistor 15 is connected in parallel to the front stage solenoid 1.
One end is used as a power supply, and the other end is used as a switching element.
on) - connected to the collector terminal of transistor 17. The emitter terminal of the transistor 17 is grounded via a current detection resistor 19. Further, a drive signal line 25 is connected to the base terminal of the transistor 17 via a buffer 21 and a resistor 23, and by applying a high-level drive signal to the drive signal 125, the transistor 17 is made conductive and the preceding solenoid 1 is driven. It is configured to do this. Drive signal line 2
The input terminal of the transistor 17 is assumed to be a point A, and the connection point between the emitter terminal of the transistor 17 and the resistor 19 is assumed to be an 8 point.

On the other hand, a series circuit of a surge absorbing diode 27 and a resistor 29 is connected in parallel to the rear solenoid 3, and one end of the solenoid 3 is connected to the power supply, and the other end is connected to the collector terminal of an NPN transistor 31 as a switching element. It is. The emitter terminal of the transistor 31 is grounded, and the base terminal is connected to the output terminal of a hysteresis comparator 33, which will be described later, through a diode 35 and an inverter 37.
and is connected via a resistor 39.

The hysteresis comparator 33 consists of a comparator 41 and a number of resistors 43, 45, 47, 49, 41, 53, 55
．． 57. The input terminal (-) of the comparator 41 is connected to the eight points via a resistor 43. The output terminal of the comparator 41 is connected to one end of the diode 35, and is also grounded at point C on the output line of the comparator 41 via a resistor 45 and a resistor i47, and the connection point of the resistors 45 and 47 is connected to a resistor 49.51. , a variable resistor 55, and a resistor 57.

The connection point between the resistors 45 and 47 is connected to a resistance position that is appropriately adjusted to the variable position of the resistor 47.

One ends of the resistors 55 and 57 are grounded, while a power supply voltage is applied to the other end through the resistor 53. The connection point E between the resistor 49 and the resistor 51 is connected to the comparator 4.
It is connected to the non-inverting input terminal (+) of No.1. Note that the connection point between the inverter 37 and the resistor 39 is F.

The operation of the solenoid drive device having the configuration shown in FIG. 1 will be explained using FIG. 2.

Figure 2 (a) shows the drive signal (voltage) of the solenoid 1.
Indicates VA. FIG. 2(b) shows the coil current 11 of the pre-stage solenoid 1.

When the drive signal VA is applied to the base terminal of the transistor 17, the collector and emitter of the transistor 17 become conductive, the solenoid 1 is driven, and the coil current 11 flows, but the coil current 11 is caused by the inductance and resistance of the coil. As shown in the figure, the force increases exponentially, and when the suction force of the solenoid becomes larger than the load, the movable core begins to move.

Figure 2 () shows the amount of movement of the movable core of the front solenoid 1 (
Stroke @) S+ is shown. Here, since the attraction force of the solenoid is approximately proportional to the square of the coil current, it can be considered that the movable core starts moving when the coil current reaches a predetermined value. can be determined.

FIG. 2(C) shows the output signal Vc of the comparator 41.

In FIG. 1, when a current 1 flows through the pre-stage solenoid 1, a current flows through the current detection resistor 19, and the potential VB at point B gradually rises. At this time, since a predetermined voltage VE is applied to the non-inverting input terminal (+) of the comparator 41, a high level voltage (for example, +15 volts) appears at the output terminal of the comparator 41 in the initial stage. As the coil current 11 increases, that is, as the potential at point B increases, the output voltage of the comparator 41 changes to a low level.

In FIG. 2(C), the time from when the drive signal VA is applied to the pre-stage solenoid 1 until the output potential of the comparator 41 is inverted is indicated by 12. This time t2 is extremely small, and it can be ensured that the front stage solenoid has started the stroke operation after the time 2.

FIG. 2(d) shows the potential at one point, which is the output voltage of the inverter 37, that is, the drive signal (voltage) of the rear solenoid 3.
It shows.

That is, as shown in FIG. 2(d), FIG. 2(C)
As soon as the output potential of the comparator 41 shown in 1 is reversed, the subsequent solenoid 3 is driven.

FIG. 2 <e> shows the coil current I2 of the rear solenoid 3, and FIG. 2 ((+)) shows the amount of movement (stroke operator) 82 of the rear solenoid 3.

Next, the drive signal VA of the front stage solenoid 1 is now cut off,
Suppose that the potential at point B has decreased. Then, the potential of the non-inverting input terminal (+) of the comparator 41 becomes a value VE - lower than the potential VE because the potential at the 0 point is already at a low level [see FIG. 2(b)]. . Therefore, the comparator 41 has a voltage VE at the non-inverting input terminal (+).
- and the gradually decreasing potential Ve at point B, so that the potential VB at point B is the potential V at the non-inverting input terminal (+).
When the potential becomes lower than E-, the output potential is set to high level (see FIG. 2(C)).

Therefore, the output of the comparator 41 is inverted by the inverter 37 and set to a low level, so that the drive signal VF for the subsequent solenoid 3 is cut off. In this way, in this example, the latter solenoid is turned on and turned off by detecting the coil current of the former solenoid.

As a result, as shown in FIG. 2(0), the rear solenoid 3 operates as the front solenoid 1 turns on and off.
From this, it turns on and off at intervals of 12 and t3, and its operation is smooth, quick, and accurate.

In the above embodiment, there are two solenoids in the front and rear stages, but this number is not limited to this.
The same explanation can be given even if the number is 3 or more.

〔Effect of the invention〕

As described above in detail, the present invention includes: a pre-stage solenoid driving means for driving a pre-stage solenoid; a pre-stage solenoid energization state detection means for detecting a change in the energization state of the pre-stage solenoid; Since the solenoid drive device is characterized by being equipped with a rear-stage solenoid drive means that drives a rear-stage solenoid based on a detection signal, it is possible to operate a plurality of solenoids in the front and rear stages smoothly and quickly. can be performed accurately.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing one embodiment of the solenoid drive device according to the present invention, Fig. 2 is a time chart for explaining the operation of the solenoid drive device shown in Fig. 1, and Fig. 3 is a conventional solenoid drive device. Block diagram of the drive device, Figure 4 is the 3rd
3 is a time chart of the solenoid drive device shown in the figure. 1... Front stage solenoid 3... Back stage solenoid 33... Hysteresis comparator patent applicant Nissan Motor Co., Ltd. Figure 1 Figure 3 Procedures Manual (spontaneous) March 22, 1985 Commissioner of the Japan Patent Office Zhi Manabu Ka 1. Indication of the case: Japanese Patent Application No. 60-5903 2. Title of the invention: Solenoid drive device 3. Name of the person making the amendment (Name>(399) Representative of Nissan Motor Co., Ltd.
Shun Ishihara 5, Subject of amendment (1) Detailed explanation column of the invention in the specification (2) Drawings (
(Figure 1) 6. Contents of the amendment (1) From line 12 to line 13 of page 4 of the specification, the phrase ``These solenoids 1, in order'' has been replaced with [These solenoids 1 and 3... [in order]]. (2) From line 15 to line 19 on the same page of the same book, [pre-stage solenoid 1... (omitted)...
...is connected to... j, one end of the front solenoid 1 is connected to the power supply, and the other end is connected to the collector terminal of an NPN transistor 17 as a switching element.The transistor 17 is connected in parallel with a diode 13 for surge absorption and a resistor. The series circuit with 15 is connected,'' (3) From the top of page 5 of the same book, from line 9 to line 13, it says, ``On the other hand, the rear solenoid 3 is also connected... (omitted)...
...It is connected. ``On the other hand, one end of the rear-stage solenoid 3 is connected to the IF source, and the other end is connected to the collector terminal of the NPN transistor 31 as a switching element.
A diode 27 and a resistor 29 for surge absorption are also connected in parallel.
A series circuit is connected, and the correction is made as follows. (4) Amend the drawing (Figure 1) as shown in the attached sheet. 7. Attached document catalog correction drawing (Figure 1) 1 copy or more

Claims (1)

[Claims] a front stage solenoid driving means for driving a front stage solenoid; a front stage solenoid energization state detection means for detecting a change in the energization state of the front stage solenoid; and a rear stage solenoid driving means for driving a rear stage solenoid based on a detection signal of the energization state detection means. A solenoid drive device comprising a solenoid drive means.