JPH0752446Y2 - Duty valve controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention provides a duty valve with an output of a prescribed predetermined duty ratio so that the movable portion of the duty valve is accurately controlled at a ratio according to the duty ratio. The present invention relates to a control device for a duty valve that is driven by.

(Prior Art) Duty valves are often used as flow rate control valves for flow passages, and are used, for example, to control braking means and friction transmission means as various gear ratio switching means in an automatic transmission.

That is, a valve body in the automatic transmission accommodates a hydraulic circuit and a duty valve for controlling the operation of the gear ratio switching means over time by controlling the hydraulic pressure in the hydraulic circuit. This duty valve adjusts the amount of oil in the hydraulic circuit to change the braking force and frictional force of the gear ratio switching means over time so that switching can be performed smoothly and switching shock is prevented. To do.

When such a duty valve is incorporated in an automatic transmission, it operates the gear ratio switching means in the automatic transmission according to the duty ratio designated by the shift controller on the vehicle body side. In this case, whether or not a predetermined hydraulic pressure is appropriately generated as an output with respect to the input duty ratio and switching is performed at a predetermined shift point becomes a problem.

For this reason, conventionally, a test controller outputs a voltage value that changes in predetermined multiple steps to the duty controller as duty ratio designation information, and the duty controller outputs the duty ratio according to each duty ratio. It is driven at a duty ratio of 1 to test whether or not a predetermined hydraulic pressure is obtained.

(Problems to be Solved by the Invention) By the way, in the conventional duty valve controller, the duty ratio is specified by the voltage value which is an analog signal from the test controller side having the built-in test program. When the designated duty ratio is received, the duty ratio output corresponding to the designated duty ratio is given to the duty valve to drive the duty valve.

Therefore, in particular, when the voltage value fluctuates due to component variations or the like between the circuits that reach the duty controller from the test controller, this disturbance easily causes a deviation in the specified duty ratio. The result is improper, and conversely, the result is normal even if the duty valve is improper, which is a problem.

An object of the present invention is to provide a duty valve control device capable of determining an appropriate duty ratio instructed even if there is a slight deviation in the duty ratio designating signal and giving a drive current of the duty ratio to the duty valve. To provide.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the duty valve control device of the duty ratio test controller of the present invention comprises an input end for receiving a duty ratio instruction signal from the duty ratio instruction means, and the above duty. When the rate instruction signal is received, the duty ratio discriminating circuit that discriminates into which of the respective duty ratio estimation regions the potential corresponds to each predetermined duty ratio, and from each duty ratio estimation region A duty generation circuit that receives each duty ratio determination signal and outputs a corresponding duty output signal; and a drive circuit that receives the duty output signal and applies a drive current corresponding to the duty ratio to the solenoid of the driven duty valve. And each of the duty ratio estimation regions is set by being sequentially divided in a magnitude direction with a predetermined potential width. And

(Operation) Since each duty ratio estimation region is set by dividing the duty ratio instruction signal in the direction of magnitude with the predetermined potential width, even if the duty ratio instruction signal is deviated within the predetermined potential width, the duty ratio discrimination circuit which receives this signal Can determine an appropriate duty ratio. Then, the duty generation circuit can output a duty output signal according to the duty discrimination signal to the drive circuit, and this drive circuit supplies a drive current according to the specified duty ratio to the duty valve to drive it with an appropriate duty ratio. You can

(Embodiment) The duty valve control device 1 shown in FIG. 1 cooperates with a controller 3 for testing a performance test of a duty valve 2 housed in a valve body (not shown) of an automatic transmission (not shown). It is used in the duty valve test device A for performing.

Here, the test controller 3 as the duty ratio instruction means has a built-in program for sequentially outputting the instruction signals of the five stages of duty ratio as shown in FIG. 5 to the duty valve control device 1 side at a predetermined timing.

Here, the duty ratio instruction voltage with a duty ratio of 0% is 0
V, 25% indicated voltage is 2.5V, 50% indicated voltage is 5.0V, 75
The% indication voltage is 7.5V and the 100% indication voltage is 10V, and basically the respective potential values are output.

The duty valve control device 1 has seven terminals as shown in FIG. Of these, the duty ratio instruction signal is input to the input end 4, and the drive current is output from the output end 7. Further, the alarm terminal J1 gives an output to the alarm lamp 11, the reset terminal J2 gives an output to the reset switch 9, and the power supply 12 is provided between the power feeding terminal J3 and the two ground terminals J4 and J5.
Are connected respectively. Reference numeral 14 in FIG. 1 denotes a power lamp, and reference numeral 15 denotes a drive lamp.

The circuit configuration of such a duty valve control device 1 will be described with reference to FIG.

The device 1 receives an input terminal 4 for receiving a duty ratio instruction signal from a controller 3, a duty ratio discriminating circuit 5 connected to this input end, and a duty ratio discriminating signal from the discriminating circuit 5 and responds thereto. A duty generating circuit 6 for issuing a duty output signal, and a solenoid drive circuit for receiving a duty output signal and giving a drive current corresponding to the duty ratio to the solenoid 201 of the duty valve 2 via the output end 7 (hereinafter simply referred to as a drive circuit). Note 8).

The duty ratio discriminating circuit 5 includes four comparators 501, 502, 503,
504, each comparator has one end connected to the input terminal 4 and the other end connected to each comparison voltage value, that is, 1.25V, 3.75V, 6.25V, 8.5V. It is connected to a generating circuit (not shown) and operates so as to determine which of the duty ratio estimation regions the input potential enters.

The duty generation circuit 6 selects one of the duty ratios shown in FIG. 5 according to the duty ratio determination signal which is the ON output of the comparator that has detected the highest potential value among the duty ratio determination circuits 5. Then, the duty output signal is output to the drive circuit 8.

The drive circuit 8 is supplied with electric power of a predetermined potential from the input terminal, and modulates a drive current of a predetermined drive frequency (here, 35 Hz) as shown in FIG. 4 in accordance with the input duty output signal. , From the terminal 7 to the solenoid of the duty valve 2.

Here, assuming that the time width per cycle is T2, the on-time is T1, and the over-excitation time is T3, the duty ratio is T1.
/ T2 × 100.

The terminal 7 is equipped with a short circuit detection circuit 10 that detects an excess current when the external solenoid is short-circuited, and thereafter stops the output of the drive current until a reset signal is input by the reset switch 9. The short-circuit detection circuit 10 uses an alarm lamp depending on the output from this short-circuit detection circuit.
11 is configured to light up.

A power supply terminal J3 is connected to the duty generating circuit 6 via a constant voltage generating circuit 13.

Such a duty valve control device 1 includes a controller 3
The duty instruction signal for the test is sequentially input every predetermined time. The duty ratio discriminating circuit 5 judges what duty ratio the voltage value falls within, and a proper duty ratio is judged. Then, the duty generation circuit 6 applies the appropriate duty output signal to the drive circuit 8. As a result, the drive circuit 8 can output a drive current having an appropriate duty ratio to the duty valve 2 side.

Here, the test results of the duty valve performed by the present inventor will be described with reference to FIGS. 6 and 7. This duty valve is mounted inside the valve body of an automatic transmission, and is operated by duty so as to control the adjusting pressure of the tightening force of the 2nd drum band.

Here, the test result obtained from the duty valve control device according to the present invention is shown as an improved product, and the test result obtained from the conventional duty valve control device is shown as an existing product.

In this case, when the duty ratio was 0%, 25%, and 50%, there was no large error between them, but at 75%, there was a difference of about 3%, and this difference was excluded by the duty valve control device of the present invention. It has become clear that you can.

As described above, according to the duty valve control device 1, it is possible to accurately obtain the operating characteristics of various duty valves in the valve body of the automatic transmission. In particular, it is possible to reliably apply a drive current having a duty ratio corresponding to the test duty ratio instruction signal to the duty valve, and prevent a deviation of the duty ratio due to disturbance from being included in the test result. Furthermore, when the output terminal 7 side is short-circuited, the drive current from that terminal is immediately cut off,
An alarm can be displayed.

(Effects of the Invention) As described above, according to the duty valve control device of the present invention, even if the potential of the duty ratio instruction signal is slightly deviated due to disturbance due to an error between components, etc. It is possible to output a proper duty output signal to the drive circuit without any deviation between the two, and the drive circuit can give a proper drive current to the duty valve and drive the valve at a proper duty ratio. Therefore, the operating characteristic value obtained during duty operation of the duty valve becomes highly reliable.

[Brief description of drawings]

FIG. 1 is an overall schematic configuration diagram of a duty valve test device using a duty valve control device as one embodiment of the present invention,
FIG. 2 is a functional block diagram of the same duty valve control device,
Fig. 4 is a schematic wiring diagram of the same duty valve control device, Fig. 4 is a waveform diagram of drive current, and Fig. 5 is a characteristic built into the duty valve control device of the same as above. Potential value explanatory diagram, FIG. 6 is a data diagram of the actual value of the duty ratio when the duty valve is driven by using the same duty valve control device, and FIG. 7 is a diagram of the data of FIG. . 2 ... Duty valve, 3 ... Test controller, 4
...... Input end, 5 ...... Duty ratio discrimination circuit, 6 ...... Duty generation circuit, 8 ...... Driving circuit, 201 ...... Solenoid.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. An input terminal for receiving a duty ratio instruction signal from the duty ratio instruction means, and a duty ratio estimation region whose potentials correspond to predetermined duty ratios when the duty ratio instruction signal is received. A duty ratio discriminating circuit that discriminates which of the duty ratios is to be entered, a duty generating circuit that receives each duty ratio discriminating signal from each duty ratio discriminating region and issues a corresponding duty output signal, and the duty output signal And a drive circuit for giving a drive current corresponding to the duty ratio to the solenoid of the driven duty valve, and each of the duty ratio judgment regions is set to be sequentially divided in the magnitude direction with a predetermined potential width. A duty valve control device for a duty ratio test controller, which is characterized in that