JP4074363B2 - Clutch hydraulic control method for gear transmission - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a clutch hydraulic pressure control method for quickly reinserting without shock when a hydraulic clutch is engaged and disengaged in a short time.
[0002]
[Prior art]
As a clutch hydraulic pressure control method for a gear transmission, for example, as described in JP-A-63-222999, when a hydraulic clutch is engaged, the clutch hydraulic pressure is first maintained at a high pressure for a certain period of time and then immediately. Conventionally proposed is a control for lowering and then increasing at a predetermined rate of increase. In other words, in order to quickly fill the empty clutch piston chamber when the clutch is engaged, the clutch hydraulic pressure is increased only for a short time in the initial stage of insertion, so-called charge pressure is supplied, and then the hydraulic pressure is lowered and then gradually increased. To reduce the clutch engagement time and reduce the insertion shock.
[0003]
[Problems to be solved by the invention]
However, if the clutch disengagement and the clutch engagement are switched in a short time in such a conventional method, the oil in the clutch piston chamber is filled again before being completely discharged. That is, in this case, since the amount of oil required for filling the clutch piston chamber is small, the filling is completed instantaneously, and the clutch engagement starts and torque transmission starts while the charge pressure is high, so that the shock is fitted. Therefore, even when switching between clutch disengagement and engagement is performed in a short time, a method is adopted in which the charge pressure holding time is set short and the charge pressure is set low so that torque transmission does not start within the charge time. The clutch engagement time was not shortened so much and there was a problem in responsiveness. An object of the present invention is to solve the above-mentioned problems and to provide a clutch hydraulic pressure control method that does not generate an insertion shock even if clutch disengagement and engagement are repeated in a short time and that shortens the clutch engagement time. .
[0004]
[Means for Solving the Problems]
The clutch hydraulic pressure control method of the present invention according to claim 1 is a clutch hydraulic pressure control method for a gear transmission having a proportional solenoid valve that creates a hydraulic pressure proportional to a command signal. If a reinsertion command is received within the specified time, the neutral holding time from the clutch disengagement command to the clutch engagement command is calculated, and this neutral retention time is divided by the clutch oil discharge time from the preset clutch disengagement command to the completion of clutch disengagement. Then, the charge pressure holding time at the initial insertion when the same clutch is reinserted is corrected and controlled by multiplying the comparison value by a preset charge pressure holding time.
[0005]
In the clutch hydraulic pressure control method according to the second aspect of the present invention, in addition to the above, a pressure detection sensor is provided in an oil passage for supplying clutch oil, and when the detected value exceeds a predetermined value, the pressure is maintained within the charge pressure holding time. Even in such a case, the supply of the charge pressure is stopped, the pressure is quickly lowered to a predetermined low pressure, and the control is shifted to a step-up control.
[0006]
[Action]
Re-insertion within the clutch oil discharge time by the comparison value obtained by dividing the neutral holding time from when the clutch release command is output until the same clutch receives the insertion command again by the clutch oil discharge time from the clutch release command to the release completion. It is determined whether or not an instruction has been issued, the degree of discharge of the pressure oil in the clutch piston chamber is determined, and the charge pressure holding time of the clutch oil is shortened according to the comparison value. The clutch engagement is not started.
[0007]
【Example】
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a block diagram of a control system of a marine reduction reverse rotation machine to which the clutch hydraulic pressure control method of the present invention is applied. In FIG. 1, the pressure oil supplied to the forward clutch 5 and the reverse clutch 6 of the marine speed reduction reverser is sucked up from the oil reservoir by the hydraulic pump 1, adjusted to a predetermined pressure by the pressure regulating valve 2, and then input to the solenoid. It is supplied to a proportional solenoid valve 3 that generates hydraulic pressure proportional to the electrical command signal. The pressure oil controlled by the proportional electromagnetic valve 3 is supplied to the forward clutch 5 or the reverse clutch 6 by the electromagnetic switching valve 4 or is held in a neutral state not supplied to either.
[0008]
The engagement / disengagement switching of the forward clutch 5 and the reverse clutch 6 is performed by operating the forward / reverse switching device 9, and the forward / backward switching device 9 has clutch engagement / disengagement detecting means for detecting the selection state of forward, neutral and reverse. When the forward clutch is engaged, the operation is electrically detected, and the forward clutch insertion command signal 10 is input to the control device 15. Similarly, when the reverse clutch is inserted, the reverse clutch insertion command signal 11 is input to the control device 15. The neutral state is determined by the fact that neither the forward clutch insertion command signal 10 nor the reverse clutch insertion command signal 11 is input to the control device 15.
[0009]
In addition, oil pressure sensors 7 and 8 are provided in the oil passages 16 and 17 from the electromagnetic switching valve 4 to the forward clutch 5 and the reverse clutch 6, respectively, and the hydraulic pressure is detected by detecting that the clutch hydraulic pressure has increased to a predetermined pressure. The detection signals 13 and 14 are output to the control device 15. The control device 15 is composed of a known pulse counter, arithmetic unit, and memory, receives clutch engagement command signals 10 and 11 from the forward / reverse switching device 9 and outputs a switching signal to the electromagnetic switching valve 4, and also a proportional electromagnetic valve. 3 outputs an operation signal to control the hydraulic pressure supplied to each clutch.
[0010]
The control device 15 is provided with a timer circuit. When the clutch engagement command signals 10 and 11 are input, the timer starts counting and stores the time when the clutch engagement command signal is cut off. In addition, the neutral holding time T _n of the clutch at the time of re-insertion is calculated from this time and the time when the clutch insertion command signal is input next. Further, the control device 15 is supplied with a clutch oil discharge time T ₀ until the pressure oil in the clutch chamber is completely discharged upon receiving a clutch disengagement command, and a relatively high clutch hydraulic pressure, that is, a charge pressure at the initial stage of clutch engagement. The charge pressure holding time _Tc is set based on experience.
[0011]
FIG. 2 is a flowchart showing an embodiment of the present invention. First, when the forward / reverse switching device is operated and a disengagement command signal for the forward clutch or the reverse clutch in the engaged state is input to the control device (step S1), the signal that excites the solenoid of the electromagnetic switching valve is cut off. is, the clutch oil supply path is simultaneously connected to the drain port to start the discharge of clutch fluid, de-instruction time t ₁ of the clutch is stored in the memory. Then, when the command signal for fitting the same clutch is input again (step S2), the neutral holding time T _n from the difference between the re-insertion instruction time t ₂ and the removal instruction time t ₁ the clutch is calculated (Step S3).
[0012]
Neutral holding time T _n by comparing the calculated neutral holding time T _n set in advance as a clutch oil discharge time T _{0 <determines} whether the clutch oil discharge time T ₀ (step S4), T _{When n} <T ₀ , the _value of neutral holding time T _n ÷ clutch oil discharge time T ₀ is calculated, and the calculated value is multiplied by the preset charge pressure holding time T _c to perform correction. Charge pressure is supplied during the charge pressure holding time T _c ′ (step S5). When the charge pressure holding time T _c ′ elapses, the charge pressure is lowered to a predetermined low pressure, and the process proceeds to a known pressure increase control in which the hydraulic pressure is increased at a constant increase rate (step S6). If T _n > T ₀ , the charge pressure holding time is not corrected as described above, and the charge pressure is supplied for a preset charge pressure holding time T _c (step S7).
[0013]
Although not shown in the flowchart, the control device receives a hydraulic pressure detection signal from a hydraulic pressure sensor provided in the clutch oil supply oil passage, and determines whether or not the detected value exceeds a predetermined value. However, if it has exceeded, even within the charge pressure holding time, the supply of the charge pressure is stopped, the pressure is lowered to a predetermined low pressure, and the boost control is performed as described above.
[0014]
FIG. 3 shows the change over time of the clutch hydraulic pressure supplied to the clutch when the same clutch is reinserted within a short time. The vertical axis shows the clutch hydraulic pressure, the horizontal axis shows the elapsed time, It shows how the clutch oil pressure is controlled over time. In the figure, the dashed line represents the pressure change in case of giving de instruction to forward clutch in engagement, the clutch de-command is given discharge of oil in the clutch chamber is started at time t _1, the time T ₀ has elapsed The discharge is completed later. Then, given a fitted commands the forward clutch again in the middle of the discharge time t _2, only the clutch oil charge pressure P ₁ between the charge pressure retention time after the calculated corrected T _{c 'is} supplied, and immediately thereafter a predetermined after being lowered to a low pressure P ₂ of, as in the conventional gradual hydraulic pressure is held at a predetermined clutch pressure at the time to rise t _4.
[0015]
【The invention's effect】
According to the present invention, since the charge pressure holding time at the time of clutch re-insertion is adjusted according to the neutral holding time of the clutch, even if the same clutch is repeatedly engaged and disengaged in a short time, an insertion shock does not occur. In addition, the clutch can be quickly engaged.
[Brief description of the drawings]
FIG. 1 is a block diagram of a control system for a marine speed reduction reverser to which a clutch hydraulic pressure control method according to the present invention is applied.
FIG. 2 is a flowchart showing an embodiment of the present invention.
FIG. 3 shows the change over time in clutch hydraulic pressure according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hydraulic pump 2 Pressure regulating valve 3 Proportional solenoid valve 4 Electromagnetic switching valve 5 Forward clutch 6 Reverse clutch 7, 8 Hydraulic sensor 9 Forward / reverse switching device 10 Forward clutch insertion command signal 11 Reverse clutch insertion command signal 13, 14 Hydraulic pressure detection signal 15 Control Devices 16, 17 Oil passage T ₀ Clutch oil discharge time T _n Neutral holding time T _c ′ Charge pressure holding time after correction

Claims (2)

In a clutch hydraulic pressure control method for a gear transmission equipped with a proportional solenoid valve that creates a hydraulic pressure proportional to the command signal, the clutch disengagement command is received when a reinsertion command is received within the time until the disengaged clutch is disengaged. The neutral holding time from the clutch insertion command to the clutch insertion command is calculated, the neutral holding time is divided by the clutch oil discharge time from the clutch release command set in advance to the clutch release completion, and this comparison value is set to the preset charge pressure hold time. A clutch hydraulic pressure control method for a gear transmission, wherein the charge pressure holding time at the initial insertion time when the same clutch is reinserted in a short time is multiplied and controlled. 2. The clutch hydraulic pressure control method according to claim 1, wherein a pressure detection sensor is provided in an oil passage for supplying clutch oil, and when the detected value exceeds a predetermined value, the supply of the charge pressure is performed even within the charge pressure holding time. The clutch hydraulic pressure control method for a gear transmission is characterized in that the control is stopped, the pressure is quickly lowered to a predetermined low pressure, and the control is gradually increased.

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