JPH0620127U - Shift control device of transmission - Google Patents

Abstract

(57) [Summary] [Object] The present invention has an object to provide a shift control device for a transmission, which enables a driver to instruct a fast shift as required such as sudden acceleration or start on a slope. A control device is provided which is provided with a sudden gear shift request switch, and which operates a gear disengagement of a main transmission and a gear shift of a sub transmission at the same time in response to a signal from the sudden gear shift request switch.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a shift control device for an electronically controlled mechanical automatic transmission that has a main transmission and a high / low two-stage range type sub transmission.

[0002]

[Prior art]

 When the mechanical transmission is controlled by an electronic control system, the actuator operates with a magnetic valve to change gears according to the engine speed and load, and also according to the driver's instruction to change gears. The time depends on the actuator output and control method. In particular, when the gear shift instruction is accompanied by the gear shift of the range type sub-gear, the gear shift operates in both the main gear and the sub gear, and thus it takes time (eg, Japanese Patent Application No. 3-5902 by the present applicant). reference).

[0003]

[Problems to be solved by the device]

 However, there is a problem that the vehicle will stop after starting on a slope, etc., because the driver cannot try to change gears quickly by upshifting uphill.

Further, there is Japanese Patent Application No. 2-101010 by the present applicant, but there is a problem that if the main and sub transmissions are simultaneously shifted, the synchro load becomes large and the synchro wears.

An object of the present invention is to provide a shift control device for a speed changer, which allows a driver to instruct a fast shift as required, such as sudden acceleration and start on a slope.

[0006]

[Means for Solving the Problems]

 According to the present invention, in a shift control device of an electronically controlled mechanical automatic transmission having a main transmission and a high / low two-stage range sub-transmission, a sudden shift request switch for a driver to request a fast shift. A control device that disengages the clutch in response to a signal from the sudden gear shift request switch, disengages the gear of the main transmission, shifts the sub transmission at the same time, and meshes the gears of the main transmission after the shift operation is completed. ing .

It is preferable that the sudden shift request switch described above be provided with a kickdown region in the fully open region of the accelerator pedal or with a switch provided in the shift lever.

[0008]

[Action]

 In the range type, when shifting the speed of the sub-transmission, it takes time because the main gear is first disengaged and the sub-speed is changed, and then the gear of the main transmission is engaged. Further, if this is done at the same time, there is a problem of wear as described above. In the present application, the gear shifting of the sub transmission and the gear shifting of the main transmission are simultaneously performed, so the time is reduced accordingly. In addition, since the gears of the main transmission mesh with each other after shifting of the sub transmission, there is no fear of wear.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, a transmission 3 is attached to an engine 1 via a mechanical clutch 2, a sub transmission 3 A is attached to the transmission 3, and an output shaft thereof is shown via a propeller shaft 4. The engine 1 is provided with a fuel injection pump 5, and the fuel injection pump 5 is provided with a drive unit 5a.

Further, a shift set control device 10 is provided above the transmission 3, and a sub-transmission 3A is provided with a range setting device 12 that operates the sub-transmission in a range type.

Further, the control device 20 that controls the transmission 3 based on the lever position of the shift tower 19 includes a shift set control device 10, a clutch stroke sensor 6, a clutch actuator 7, a gear rotation sensor 8, and a vehicle speed sensor, respectively. 9, a shift position detecting device 11 and a range position detecting device 14a are connected.

A clutch switch 18 is provided on the clutch pedal 17, and a potentiometer 16 is attached to the accelerator pedal 15. The potentiometer 16 is connected to a control device 20 and a drive unit 5 a of the fuel injection pump 5 is provided. Are connected to the control device 20.

In FIG. 2, a range set control device 12, a range position detection device 14a, a shift set control device 10, a shift position detection device 11, a gear rotation sensor 8 and a vehicle speed sensor 9 are respectively transmission (T / M) control circuits. It is connected to 20d.

The clutch actuator 7 and the clutch stroke sensor 6 are connected to a clutch control circuit 20f, the injection pump drive unit 5a is connected to an accelerator control circuit, and the accelerator potentiometer is connected to a shift change control unit 20a.

FIG. 3 is a characteristic diagram showing the relationship between the accelerator opening of the actuator 16 and the output voltage. The fully open range is used as the kickdown range, and the output at this time is input to the shift change control section as a sudden shift signal.

The operation will be described below with reference to FIG.

In operation, the accelerator pedal is depressed to the kick-down region shown in FIG. 3 to instruct a sudden shift, and the shift lever is moved to the shift-up position to instruct a shift-up (step S1). The clutch is disengaged (step S2), and it is determined whether the clutch disengagement is completed (step S3). If NO, the process returns, and if YES, the meshed gear of the main transmission is disengaged (step S4). The main transmission determines whether gear removal is completed (step S5). At the same time as steps S4 and S5, the range section is shifted (step S6). It is determined whether or not the shift of the range section is completed (step S7).

If NO, the process returns, and if YES, the main transmission is shifted (step S8). It is determined whether or not the gear shift of the main transmission is completed (step S9), the process returns if NO, and the clutch is engaged if YES (step S10). It is judged whether or not the clutch engagement is completed (step S11), the process returns if NO, and the control ends if YES.

Here, as compared with the conventional control flowchart shown in FIG. 7, in the present application, steps S4 and S5 and steps S6 and S7 are arranged in parallel, whereas in the conventional case, steps S4 to S7 are performed. Since it is in series, the shift time is reduced by this amount (for example, 0.4 seconds).

FIG. 5 shows another embodiment of the present invention, except that the shift lever 19a of the shift tower 19 is provided with a function switch 21 for instructing the controller to perform a sudden shift, and the kickdown of the potentiometer of the accelerator pedal is removed. Is the same as in the first embodiment.

FIG. 6 shows a block diagram of the control device shown in FIG. 5, and only the shift lever function switch 21 is added to FIG.

Therefore, the operation is the same as in the kick down area of the potentiometer of the accelerator pedal, because the function switch 21 of the shift lever instructs a rapid shift to shift gears.

[0024]

[Effect of device]

 Since the present invention is configured as described above, when a sudden shift is required, such as when accelerating or starting on a slope, the accelerator pedal is pushed to the kick down area, which is the sudden shift request switch, or the shift lever The speed change time can be shortened by turning on the sudden speed change switch provided at the position to change the speed.

Further, since the sub-transmission and the main transmission are simultaneously operated only for gear shifting of the sub-transmission and gear removal of the main transmission, wear of the synchronizer does not occur.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 2 is a control block diagram of FIG.

FIG. 3 is a diagram showing a relationship between an accelerator opening and an output voltage in FIG.

FIG. 4 is a control flowchart of FIG.

FIG. 5 is an overall configuration diagram showing another embodiment of the present invention.

6 is a control block diagram of FIG.

FIG. 7 is a diagram showing an example of a conventional control flow chart.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Engine 2 ... Clutch 3 ... Transmission 3A ... Sub transmission 5 ... Fuel injection pump 10 ... Gear shift unit 15 ... Accelerator pedal 16 ... Potentiometer 19 ... Shift tower 20 ... Control device 21 ... Function switch

Claims (1)

[Scope of utility model registration request] 1. A shift control device for an electronically controlled mechanical automatic transmission, comprising a main transmission and a high / low two-stage range sub-transmission, and a sudden shift request switch for a driver to request a fast shift. A control device is provided which disengages the clutch in response to a signal from the sudden shift request switch, disengages the gear of the main transmission, simultaneously shifts the sub transmission, and meshes the gears of the main transmission after completion of the shift operation. A shift control device for a transmission, comprising: