JPH0637235Y2 - Transmission shift control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a shift control device for an automobile transmission.

<Prior Art> As a mechanism for shifting / selecting a transmission, a mechanism using a fluid pressure cylinder by air pressure or hydraulic pressure is known.

<Problems to be Solved by the Invention> In the conventional shift control described above, as shown in the flowchart of FIG. 3, the change lever signal A and the clutch operation determination B are input to the microcomputer, and the clutch operation determination B is detected.
In the case of YES, the microcomputer sends a shift command K based on the change lever signal A to control the electromagnetic control valve for controlling the supply and discharge of the pressure fluid in the shift cylinder, and when the clutch operation judgment B is NO, it becomes a YES signal. Hold the current status until C. On the other hand, the predetermined shift completion determination I is made to be yes by the shift command K.
When the signal of s is the shift end J, the signal of NO is A →
This is a program configuration in which the steps B → K are repeated until the signal of yes.

<Problems to be solved by the invention> By the way, in the above-mentioned conventional example, since the transmission shift speed by the step of the shift command K is the same speed as that of the gear having the synchro mechanism, the gear shifts to the first speed and the reverse without the synchro mechanism. There was a problem that a gear noise and discomfort occurred when shifting.

<Means for Solving the Problems> The present invention solves the above-mentioned conventional problems, and its characteristic configuration is a transmission case in a transmission that does not have a synchronizing mechanism at the first speed and the reverse speed. Shift select cylinder, solenoid control valve that controls the supply and discharge of pressure fluid to this shift select cylinder, shift position sensor that detects the shift position of the change lever, and clutch switch that detects the operation of the clutch. A vehicle speed sensor for detecting a vehicle speed, and a microcomputer for inputting signals from the shift position sensor, the clutch switch, the vehicle speed sensor and the like to control the electromagnetic control valve. Early shift while running, first shift and reverse shift when stopped In the above, the electromagnetic control valve is controlled so that the shift is performed slowly.

<Operation> The present invention has the above-described structure to prevent gear squealing as a slow shift when shifting to the first speed and reverse, and particularly when shifting to the first speed, the slow shift is performed by judging whether or not the vehicle is running. By using different types of early shifts, it is possible to obtain a shift operation with no discomfort.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 10 is a transmission, 11 is a transmission case cover, and 12 is a shaft housing for shifting the transmission 10. A select cylinder 14 and a shift cylinder 15 are provided at one end of the shaft housing 12.

Reference numeral 16 is a control box provided in the cab. The control box 16 operates a contact lever or a non-contact type switch by operating the change lever 17 to a desired gear shift position, electrically detects the gear shift position, and transmits a signal thereof.

22 is a clutch switch, and 23 is a vehicle speed sensor. The microcomputer 18 is provided with which the clutch switch, the vehicle speed sensor 21 and the signal from the control box 16 are input and which is operated to shift and select the transmission 10. This shift and select operation control means is provided with electromagnetic control valves 20 and 21 for controlling supply and discharge of pneumatic pressure or hydraulic fluid pressure in the select cylinder 14 and the shift cylinder 15, respectively. It is configured to be controlled by a command signal from the computer 18.

The steps of the program controlled by the command signal of the microcomputer 18 are as shown in the flowchart of FIG.

This step structure is based on the conventional program shown in FIG.
The following programs have been subscribed during the step.

That is, after the step of the clutch operation determination B, the first speed shift determination D → reverse shift determination F → early shift H is added.

Furthermore, the step of the running judgment E for judging whether the vehicle is running or stopped based on the YES signal of the first speed shift judgment D, and the slow shift for instructing the slow shift by the NO signal of the step of the running judgment E G step is set and the YES signal in the step E of running judgment is set to early shift H
The command signal for the step of the slow shift G is set before the first shift H and is set after the early shift H.

Since the present invention is configured as described above, when the YES signal is issued in the step of the first speed shift determination D, the running determination E is used to determine whether the vehicle is running or stopped, and when this is the NO signal. The electromagnetic control valve 21 is throttle-controlled by the command signal of the slow shift G to operate the shift cylinder 15 at a slow speed and slowly perform the shift operation. When the running determination E is YES signal, the electric machine control valve 21 is fully opened by the command signal of the early shift H, and the shift cylinder 15 is rapidly operated to perform the early shift operation.
This is when downshifting to the 1st speed is desired and the engine braking is effective, or when there is no power when going uphill and downshifting to the 1st speed requires a quick shift operation. In this case, gear squeal cannot be prevented, but the shift operation of the early shift can be obtained with an emphasis on traveling safety.

On the other hand, in the step of the reverse shift judgment F, the YES signal causes the shift cylinder 15 to be controlled to operate in the slow speed by the command signal for the slow shift G, and to slowly shift to the reverse gear.

The electromagnetic control valve 21 that performs the above control is a two-stage throttle valve that switches the throttle between large and small types. Therefore, in the case of having a synchro mechanism, the aperture is enlarged at the start of sleeve movement,
The microcomputer 18 controls the diaphragm to be small during the synchronization and to be large for the engagement between the sleeve and the gear. Further, when the synchro mechanism is not provided, the diaphragm is enlarged at the start of the sleeve movement, but the time is shortened. The aperture is reduced during synchronization, but the time is increased. Increase the size of the diaphragm when engaging the sleeve and gear.

This is because if there is no synchro mechanism, if the first speed or reverse gear is controlled at the same speed as when there is a synchro mechanism, it is difficult for the gears to enter, and gear noise will occur. The shift control speed is changed.

<Effects of the Invention> As described above, according to the present invention, in the one in which the microcomputer controls the shift / select cylinder of the transmission by the detection signal of the shift position of the change lever to control the shift, the first speed and the reverse movement are performed when the vehicle is stopped. The configuration is such that slow shift control is performed when shifting to the first gear, and early shift control is performed when shifting to the first speed while the vehicle is running. However, during the first speed downshift during traveling, the early shift ensures an early shift operation at the time of downhill or uphill, and there is an effect that traveling safety of downhill and uphill can be maintained.

[Brief description of drawings]

FIG. 1 is a perspective view of the device of the present invention, FIG. 2 is a flow chart showing program steps of a shift control according to the present invention, and FIG. 3 is a flow chart of a conventional shift control. 10 ... Transmission, 14 ... Select cylinder, 15 ...
Shift cylinder, 16 ... Control box, 17 ... Change lever, 18 ... Microcomputer, 20, 21 ... Electromagnetic control valve.

Claims (1)

[Scope of utility model registration request] 1. A shift select cylinder installed in a transmission case, and an electromagnetic control valve for controlling the supply and discharge of pressure fluid to and from the shift select cylinder in a transmission that does not have a synchronizing mechanism at the first speed and the reverse speed. A shift position sensor for detecting the shift position of the change lever, a clutch switch for detecting the operation of the clutch, a vehicle speed sensor for detecting the vehicle speed, and signals for the shift position sensor, the clutch switch, the vehicle speed sensor, etc. And a microcomputer that controls the electromagnetic control valve.
A transmission shift control device for a transmission, characterized in that the electromagnetic control valve is controlled such that an early shift is performed during traveling during a speed shift, and a slow shift is performed during a first speed shift and a reverse shift when the vehicle is stopped.