JPS61266853A - Automatic speed change gear - Google Patents

Abstract

PURPOSE:To prevent the interference in automatic/manual speed change by interrupting the automatic speed change operation when a shift lever is manually changed over to a neutral position, and holding the lever for a prescribed time when manual operation is carried out during a standby time after a target position has been determined. CONSTITUTION:A position detecting means d of a shaft lever b, a neutral position discriminating means e and a target position determining means of are provided. A timer means g which stands by for a prescribed time in response to the output of the target position determining means f, a manual intervention discriminating means h and a comparison means i which compares a target position with the present position are provided. A signal is output to an actuator c so as to shift the shift lever b in response to the nonconformity output of the comparison means i, and the neutral position discriminating means e is reoperated. Thus, the interfering action between automatic speed change operation and manual speed change operation can be removed.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an automatic transmission device that is installed on a combine harvester, a tractor, or the like and can be manually operated.

BACKGROUND ART Some automatic transmission devices installed in combine harvesters, tractors, etc. are configured to automatically change gears by driving a shift lever for changing a transmission with an actuator. For example, the actuator that uses a motor includes, in addition to a shift motor that drives a shift lever, a clutch that engages and disengages between the shift motor and the shift lever, and a clutch motor that drives the clutch in the engagement and disengagement direction. In the case of automatic control, the shift motor and shift lever are interlocked and connected by driving the clutch motor and engaging the clutch, and then the shift lever is moved by driving the shift motor. When the gear is shifted to a required gear and automatic control is not performed, the interlock between the shift motor and the shift lever is cut off so that the shift lever can be operated manually.

In this way, in conventional automatic transmission devices, it is possible to perform manual gear shifting operations as appropriate even when in automatic gear shifting mode, but if the structure is simply designed to allow manual intervention mechanically, automatic gear shifting operations cannot be performed. There is a risk that the manual speed change operation and the automatic speed change operation will interfere with each other, causing problems such as the automatic speed change operation becoming inconsistent or the manual speed change operation being canceled by the automatic speed change operation.

For example, an automatic transmission of the type described above that drives the shift lever in the active, 1 knee, and 2 positions (with the shift lever in the 4 position,
If the shift lever is manually operated after the shift lever drive amount has been determined based on various conditions such as load, the reference point for shift lever drive will change.
The shift lever may be driven beyond the target shift speed more than necessary, or the shift lever may not reach the target shift speed.

Furthermore, if the shift lever is manually operated before the next target position for automatic gear shifting is determined, the shift lever may be driven by the next automatic gear shifting operation and return to the position before the manual operation.

Therefore, in an automatic transmission device that allows manual operation to intervene during automatic shift mode, it is necessary to take necessary measures to prevent automatic shift operation and manual parallel speed operation from interfering with each other.

In particular, manually move the shift lever to the neutral position (neutral)
Measures to be taken in the event of a switch are important. This is because the operator often switches the shift lever to the neutral position because a situation has occurred that would cause the aircraft to stop moving; - It would be extremely dangerous if the automatic gear shift operation immediately switches to one of the soft gears and the aircraft starts moving again.

<Object of the Invention> The present invention has been made in view of the above-mentioned problems, and provides an effective manual shifting operation even in automatic shifting mode by eliminating interference between automatic shifting operation and manual shifting operation. The purpose is to make the shift lever easier to operate and to ensure safety when manually switching the shift lever to the neutral position.

<Structure of the Invention> In order to achieve the above object, the present invention, as shown in the functional block diagram of FIG. In an automatic transmission device that performs automatic switching, there is a position detecting means d for detecting the position of the shift lever b, and a neutral position detecting means d for determining whether the shift lever b is in the neutral position based on a detection signal from the position detecting means d. a position discriminator @) e and a target position determining means r for determining a target position that is the optimum shift stage corresponding to various conditions such as load in response to the non-neutral position discrimination output of the neutral position discriminating means e;
a timer means g that waits for a certain period of time in response to the determination output of the target position determining means; and a timer means g that determines whether or not the shift lever b is manually operated during the standby operation of the timer means g and determines whether or not to intervene. Manual intervention determining means for re-operating the neutral position determining means e based on the output, and comparing the target position and the current position of the shift lever b in response to the time-up output of the timer means g, and determining the neutral position based on the coincidence output. Comparing means i for re-operating the determining means e; and in response to the discrepancy output from the comparing means i, outputting a drive signal to the actuator C to displace the shift lever b by a predetermined amount, and re-operating the neutral position determining means e. The automatic transmission includes a drive signal output means j for causing the transmission to occur.

<Example> Hereinafter, the present invention will be described in detail based on an example shown in the drawings. FIG. 2 is a block diagram of an embodiment of the automatic transmission of the present invention, and the automatic transmission includes a transmission 1 and a shift lever 2 for switching the transmission I.
, a shift motor 3 that is an actuator that drives the shift lever 2, a clutch 4 that engages and disengages between the shift motor 3 and the shift lever 2, and a clutch motor that drives the clutch 4 in the engagement and disengagement direction. 5, a position detecting means 6 such as a potentiometer for detecting the position of the shift lever 2, and a microcomputer 7 as a control section.

Therefore, the position detection signal from the position detection means 6 is
It is input to the microcomputer 7 through the converter 8. An engagement/disengagement driving signal for the clutch motor 5 outputted from the microcomputer 7 is inputted to the drive relay IO through the power transistor array 9, and the output of the drive relay IO drives the clutch motor 5 in the clutch engagement/disengagement direction. Further, the drive signal to the shift motor 3 outputted from the microcomputer 7 is transmitted to the power transistor array 9.
The output of the drive circuit 11 drives the shift motor 3.

The microcomputer 7 includes a neutral position determining means e, a target position determining means f, a timer means g, a manual intervention determining means, a comparing means i, and a drive signal output means j shown in FIG.
It functionally has a CPU 12 and an RO
M13, RAM14, and input/output interface 15
It consists of.

In the above configuration, when automatic shift control is not performed, the clutch 4 is disengaged and the interlock between the shift motor 3 and the shift lever 2 is cut off, so the operator can operate the shift lever 2 regardless of the shift motor 3. Can be operated manually. On the other hand, in the case of automatic shift control, the clutch 4 is engaged by the drive of the clutch motor 5, and the shift motor 3 and the shift lever 2 are interlocked and connected, and in this state, the shift motor 3 drives the shift lever 2. The transmission e moves in conjunction with the displacement of the shift lever 2.
・The shift stage at 1 is changed.

Therefore, in the device of the present invention, control is performed so that the automatic shift operation and the manual shift operation do not interfere with each other. The operation will be explained in detail based on the flowchart in FIG.

First, in step N1, a position detection signal from the position detection means 6 is read to detect the current position Sm of the shift lever 2. In the next step N2, it is determined whether the current position Sm of the shift lever 2 is at the neutral position. If the current position Sm of the shift lever 2 is the neutral position, step N1
The process returns to step Nl and repeats the loop of step 2, without proceeding to the subsequent steps of automatic shift control. Therefore, when the shift lever 2 is switched to the neutral position by the operator's manual operation, the automatic shift control operation is not performed and the shift lever 2 is held at the neutral position, so that the meshing state of the transmission 1 is also maintained at the neutral position. , the operation of the driven part stops.

If it is determined in step N2 that the current position Sm of the shift lever 2 is not the neutral position, that is, it is at any of the shift positions, the process proceeds to step N3, and a predetermined blog shift position is selected.
The optimum shift position corresponding to various conditions such as load amount is determined by This determined shift position is the target position S to which the shift lever 2 should be displaced by subsequent control operations.
It is r.

In conventional automatic transmissions of this kind, the shift lever is often driven immediately after determining the target position, but in the present invention, the shift lever 2 is driven immediately after the target position Sr is determined. Don't go in, just wait. That is, in step N4, it is determined whether a certain waiting time has elapsed. Immediately after determining the target position Sr, the waiting time has not yet elapsed, so in that case, the process moves to step N5, and in step N5, a time variable Tc indicating the elapsed waiting time is counted. Proceed to step N6.

In step N6, the previous target position St and the current position Sm
Determine whether they are equal or not. The previous target position St is the position reached by the shift lever 2 due to the previous automatic shift control operation, and if the shift lever 2 has not been manually operated since then (if it is dry, the current position 5 Ifi is reached). Therefore, if the previous target position St and the current position Sm do not match, manual operation of the shift lever 2 has intervened in the meantime. This is a step of determining whether manual operation has intervened.If manual operation of shift lever 2 has not intervened, that is, the previous target position S
If t and the current position fil S ts match,
Returning to step Nl, from step Nl to step N
The loops up to 6 are repeated, and the time variable Tc is counted for each loop. When the time variable Tc reaches a certain number and a certain waiting time has elapsed after the determination of the target position Sr, steps N4 to N7 are performed. branch to.

On the other hand, in step N6, manual operation of the shift lever 2 intervenes, that is, the previous target position St and the current position SIl
If it is determined that they do not match, the process proceeds to step N8, where the count value of the time variable Tc is cleared, and then, in step N9, the current position Sm is set as the previous target position St, and in step NIO, the current target position Sr is set. Previous target position S
t, and by these two steps the current target position Sr
and the current position Si, and the process returns to step N1.

The fact that the target position Sr and the current position 5I11 match in this way is equivalent to the completion of one loop of automatic shift control, so when the process returns to step Nl and enters the next loop, In step N3 of the loop, the previous automatic shift control operation is assumed to have ended, and the next automatic shift control operation is started to newly determine the target position 11st. Since the count value of the previous standby time has already been cleared, the time variable Tc is counted from the initial value in steps N4 and N5, and the process waits until the time variable Tc reaches a constant value. Therefore, during this period, the shift lever 2 is not driven by automatic shift control, and the shift lever 2 is held at the position operated by the operator for a certain period of time.

On the other hand, after the target position Sr is determined in step N3,
When the predetermined waiting time has elapsed, the process proceeds to step N7, as described above. In this step N7, it is determined whether a target position Sr different from the previous target position St has been determined. Step N7 is a step for determining whether or not it is necessary to drive the shift lever 2 through automatic shift control.

The shift lever 2 should have reached the previous target position St due to the previous automatic shift control operation, so if the previous target position St and the current target position Sr are equal, the shift lever 2 should not be moved any further. No need to drive. In that case, the process moves to step N6. The operations of each step from step N6 onwards are as already explained.

In step N7, the previous target position St and the current target position S are
If it is determined that the shift lever 2 does not match, it is necessary to drive the shift lever 2, and the process proceeds to the step of driving the shift lever 2 following step Nll. First, step Ni
In l, the target position Sr and the current position Sm are compared, and if the target position Sr is higher than the current position 5III, the process advances to steps N12 and 13, and if the target position Sr is lower than the current position Sm, the process advances to step N14. Proceed to step 15.

Stella 2N! 2, the current position of shift lever 2 is 5.
It is determined whether I11 has moved to the next higher position. Since the current position Sm has not changed yet at the stage where the shift lever 2 is not driven, the determination at step N12 is rNOJ, in which case the process advances to step N13 and the signal for driving the shift lever 2 is is output, and the process returns to step Nl.

The clutch motor 5 and shift motor 3 are activated by the drive signal.
performs the required driving operation, and the shift lever 2 is displaced from its current position toward the higher shift gear by driving each motor 5゜3, but when the shift lever 2 actually reaches the higher shift gear, If the target position Sr has not yet been reached, the determination in step N12 is rYES.
J, so in that case, the process branches from step N12 to step N16, clears the time variable Tc in step N1G, and returns to step N1. In the loop after returning to step N1, since the time variable Te is at the initial value, the time variable Tc is newly counted in step N4.5, and the count value changes to the constant value 'a.
Do not drive the second lever 2 after 6t.

Therefore, even if a shift gear higher than the current position Sr is at the target position Sr, the shift lever 2 is at the target position Sr.
It is not driven all at once to r, but waits for a certain period of time each time it is displaced by one step.

The same applies when the target position Sr is lower than the current position 5III, and the current position 5 of the shift lever 2 is changed in step N14.
It is determined whether ffl has moved to the next lower position.
At the stage where the shift lever 2 is not driven, the current position Sm has not changed yet, so the judgment is rNOJ, in which case step N! At step 4, a drive signal for displacing the shift lever 2 to a lower shift stage is output, and the process returns to step N1.

This drive signal causes the shift lever 2 to move toward the lower shift stage, and if it actually reaches the lower shift stage and has not yet reached the target position Sr, step N
Since the determination at i4 is rYESJ, in that case, the process branches from step N14 to step N16, where the time variable Tc is cleared and the process returns to step Nl. In the loop after returning to step Nl, since the time variable Tc is at the initial value, the time variable Tc is newly counted in step N4.5, and the shift lever is pressed until the count value reaches a constant value. Driving operation 2 is not performed. In this way, even when the shift lever 2 is moved to a lower shift stage, a certain period of time is required each time the shift lever 2 is shifted by one stage.

In this way, the shift lever 2 moves toward the target position 5I11 step by step to the upper or lower shift step with waiting time in between, thereby changing the target position Sr and the current position SL.
1, it means that one automatic shift control operation has been completed, so step Nil to step N1
7, and in step Nj7, the previous target position St
is set as the current position Si and the process returns to step Nl.

<Effects of the Invention> As described above, according to the present invention, the interference between automatic shift operation and manual shift operation is eliminated, and effective manual shift operation can be performed even in the automatic shift mode.

That is, when the shift lever is manually switched to the neutral position, the automatic shift operation is not performed, and the automatic shift operation does not cause the aircraft to start traveling on its own, making it safe.

Additionally, if the shift lever is manually operated during the standby time after the target position has been determined, the shift lever will be held at the manually operated position for a certain period of time, so that the manually operated shift lever will be automatically shifted. There is no inconvenience such as being immediately returned to the original position. Furthermore, after the target position is determined, manual intervention is detected and then the shift lever is driven, so that there is no error in driving the shift lever due to automatic shift operation.

[Brief explanation of the drawing]

Figure 1 is a functional block diagram that clearly shows the configuration of the present invention, Figure 2 is a functional block diagram clearly showing the configuration of the present invention.
The figure is a block diagram of one embodiment, and FIG. 3 is a flowchart showing the operation of the embodiment. 1...Transmission, 2...Shift lever-5
3...Shift motor, 4...Clutch, 5...Clutch motor, 6...Lower position detection stage, 7...Micro combination 2-5.

Claims (1)

[Claims] (1) In an automatic transmission device that automatically changes gears by shifting and driving a shift lever for switching the transmission with an actuator, a position detecting means for detecting the position of the shift lever and a detection signal of the position detecting means are provided. a neutral position determining means for determining whether or not the shift lever is in a neutral position based on the neutral position determining means; and an optimum shift gear corresponding to various conditions such as load in response to a non-neutral position determining output of the neutral position determining means. A target position determining means for determining a target position, a timer means for waiting for a certain period of time in response to a determined output of the target position determining means, and a timer means for determining whether or not a shift lever is manually operated during the standby operation of the timer means. manual intervention determining means for determining and re-operating the neutral position determining means based on the intervention determination output; Comparing means for re-operating the neutral position determining means; and a driving signal output for outputting a drive signal to an actuator to displace the shift lever by a predetermined amount in response to the discrepancy output of the comparing means, and re-operating the neutral position determining means. An automatic transmission device comprising: means.