JPH0117713Y2 - - Google Patents

Description

[Detailed explanation of the idea] <Technical field> The present invention relates to an automatic transmission device for a vehicle.

<Background Art> In conventional manual vehicle transmission systems, a driver operates a lever to shift to a desired shift stage.

In addition, in order to ensure smooth engagement between the gear driven by the countershaft and the gear driven by the main shaft during a shift change, it is best to perform the shift change when the rotations of each gear are synchronized. Although a synchronization mechanism is provided to mechanically synchronize the two, there is a problem in that the cost is high. On the other hand, if a synchronization mechanism is not provided, costs can be significantly reduced, but in order to perform shift change operations smoothly, the driver needs to understand the relationship between the vehicle speed, the shift gear used, and the engine rotation speed. However, there is an inconvenience in that it requires considerable skill to use it properly.

Moreover, in the case of a manual transmission, as mentioned earlier, the driver must operate a lever each time the shift is changed, which makes it difficult to change the shift when driving long distances or in congested conditions. It was extremely troublesome and tiring.

For this reason, in recent years more and more vehicles are equipped with automatic transmissions that automatically perform shift changes and reduce driver fatigue, but most of these systems use torque converters.
Compared to mechanical clutches, fuel efficiency is lower and there are problems in terms of vehicle maintenance.

Therefore, the applicant of the present application first proposed an automatic transmission using a mechanical clutch.
163228 and Utility Application No. 177192, etc.).

By the way, in a simple semi-automatic automatic transmission system using a mechanical clutch like this, when downshifting is performed without a mechanical synchronization mechanism, it is necessary to increase the rotation of the countershaft side by the engine. This is done by the driver's double clutch operation. However, beginners often forget this operation.

<Purpose of the invention> This invention was made in view of the above circumstances.
Using a mechanical clutch and a transmission with shift gears that do not have a synchronizing mechanism, the shift gear is selected and the actuator automatically changes the shift based on commands from the control unit, and also provides a double clutch instruction when downshifting. An object of the present invention is to provide an automatic transmission device for a vehicle that improves fuel efficiency and reduces driver fatigue, and allows the driver to smoothly perform a shift change operation.

<Summary of the invention> For this reason, the present invention provides a shift specification means for specifying the shift gear to be used, a clutch position detection means for detecting the clutch position based on the clutch pedal position, and an accelerator opening detection means. command means for commanding a change operation;
When the command means outputs a shift change command signal, the synchronization speed of the countershaft at the specified shift stage is compared with the actual countershaft rotation speed based on the neutral signal from the shift position detection means to determine whether synchronization has been achieved. a synchronization determination means for determining the synchronization detection signal; and a shift operation means for performing a shift change to a designated shift stage when the determination means outputs a synchronization detection signal, and the comparison result of the synchronization determination means is that the actual measured value is smaller. and a display means for displaying that a double clutch operation command has been generated from the command means and for displaying a stop of the double clutch operation command when the command means detects that a double clutch operation has been performed. did.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

1 and 2 show the hardware configuration and block diagram of one embodiment of the present invention. In the figure,
For example, a transmission 3 with an auxiliary transmission is attached to the engine 1 via a mechanical clutch 2, and has a shift stage without a mechanical synchronizer.
Its output shaft is connected to a rear axle (not shown) via a propeller shaft 4.

The transmission 3 includes a countershaft rotational speed sensor 5 that detects the rotational speed Na of the countershaft, and a rotational speed Nc of the output shaft.
a transmission output shaft rotational speed sensor 6 that detects the rotational speed Nb of the subshaft, a subshaft rotational speed sensor 7 that detects the rotational speed Nb of the subshaft, a transmission actuator 8 that shifts the transmission, and a shift position that detects the shift position. A sensor 9 is attached.

Reference numeral 10 denotes a shift specification box provided in the driver's cab for specifying a shift stage when changing a shift, and includes a plurality of shift specification push buttons 11 corresponding to each shift stage, and a shift box for indicating that a shift has been completed. A completion lamp 12, a double clutch command lamp 13 for displaying a double clutch operation command at the time of downshifting, and a buzzer 14 for warning when a shift is completed and a double clutch command is issued are provided.

Reference numeral 15 denotes a clutch position sensor that detects the disengaged/engaged position of the clutch from the position of the clutch pedal 16;
7 is an accelerator opening sensor.

On the other hand, the control unit 20 includes a shift change control circuit 21 that issues a shift change command when shift change requirements are satisfied based on signals from the shift designation push button 11, the clutch position sensor 15, and the accelerator opening sensor 17. When the shift change command is output from the shift change control circuit 21, the transmission 3 is activated based on the signal from the shift position sensor 9.
The synchro speed N at the designated shift stage is calculated from the input signals from each rotation speed sensor 5, 6, and 7, and the calculated value and the rotation speed Na (current a synchronization determination circuit 22 that determines the synchronization state by comparing the rotation speed) and the synchronization determination circuit 22;
A transmission control circuit 2 receives a synchronization detection signal from the transmission control circuit 2 and issues a drive signal to the shift change actuator 8 via a relay box 24.
3 are provided. Further, the aforementioned shift change control circuit 21 outputs an alarm signal to the transmission error lamp 25 or the clutch error lamp 26, respectively, when a malfunction occurs in the shift operation or clutch operation during the shift change operation process. 27 is Batsuteri.

Next, the series of operations when changing the shift is shown in the third section.
The explanation will be based on the flowchart shown in the figure.

When performing a shift change, the driver presses the shift designation push button 11 corresponding to the shift stage to be used in the shift designation box 10. As a result, the shift change control operation by the control unit 20 starts.

First, when a shift stage designation signal from the shift designation push button 11 is input to the shift change control circuit 21, the control circuit 21 determines whether the clutch is in the disengaged state and whether the accelerator opening is 0. This determination is made based on signals from the clutch position sensor 15 and accelerator opening sensor 17. That is, it is determined whether the shift change request acceptance condition is satisfied (S1). If the conditions are satisfied, then the transmission control circuit 23 issues an activation signal to the shift change actuator 8 to the neutral position via the relay box 24 (S2). Next, based on the signal from the shift position sensor 9, it is determined whether the neutral position has been reached, and if NO, the process proceeds to S18, where the transmission error lamp 25 is blinked and the buzzer 14
will sound intermittently to issue an alarm and end the control.
If YES, the process proceeds to S4, where the shift change control circuit 21 determines whether the specified shift stage is neutral, and if YES, the process proceeds to S10, which turns off the lit error lamps, and further S11
The shift completion lamp 12 and buzzer 14 in the shift designation box 10 are activated to complete the shift change operation. If the determination in S4 is NO, proceed to S5. In S5, the synchronization determination circuit 22 synchronizes with the current transmission output shaft based on the signals from the rotational speed sensors 5, 6, and 7 that detect the rotational speed of the countershaft, transmission output shaft, and subshaft. The synchro speed N of the countershaft or subshaft of the designated shift stage is calculated, and in S6, this calculated value N is compared with the current rotational speed Na (Nb) of the countershaft (or subshaft). Here, N<Na
If (Nb), it is a shift up operation, and the process proceeds to S7 where Na (Nb) is the value N + ΔN, which is N plus ΔN.
When the synchro determination circuit 22 waits until the value is below and detects that N+ΔN≧Na(Nb),
The transmission control circuit 23 outputs a detection signal and operates the shift change actuator 8 to set the shift gear at the designated shift position (S8). Then, based on the signal from the shift position sensor 9, the shift change control circuit 21 determines whether or not the shift gear has been set (S9).
If YES, turn off the error lamps (S10),
The shift completion lamp 12 and buzzer 14 are activated to notify the end of the shift change operation (S11), and the driver then operates the clutch pedal 16 and accelerator pedal.

On the other hand, when it is determined in S6 that N≧Na (Nb) (NO), it is a downshift operation, and S12 is executed and the shift change control circuit 21
A double clutch command is output from the double clutch command lamp 13 and the buzzer 14 are activated.
When such a command is displayed, the driver engages the clutch, increases the engine speed, and then disengages the clutch again, a so-called double-clutch operation, and when this double-clutch operation is detected (S13). , the operation signals of the double clutch command lamp 13 and the buzzer 14 are stopped (S14), and the synchronization judgment is performed again in S6. If N<Na (Nb), the process proceeds to S7 and the downshift operation is performed in the same manner as described above. end.

Also, if the gear is not set when setting the shift gear to the specified shift position after synchronization (if determined as NO in S9),
Turn on the transmission error lamp 25 (S15) and set the transmission to the neutral position (S16). If the countershaft is set to the neutral position, the rotational speed of the countershaft has decreased, so the process proceeds to S12 and a double clutch command is output. On the other hand, if it is not set to the neutral position, the transmission error lamp 25 is made to blink and the buzzer 14 is sounded intermittently to notify the transmission failure by executing S18.

<Effects of the invention> As described above, according to the present invention, a shift change operation to a shift gear is specified, and after the shift gear specification is specified, a synchronization state is automatically detected and a shift change operation is performed, and a downshift operation is performed. Since double-clutch operation is sometimes commanded, even beginners can perform shift changes smoothly, and fuel efficiency can be improved compared to systems that use a torque converter. Furthermore, a low-cost automatic transmission can be provided.

[Brief explanation of the drawing]

Figure 1 is a hardware configuration diagram showing one embodiment of the present invention, Figure 2 is a block diagram of the same embodiment, and Figure 3 is a block diagram of the same embodiment.
The figure shows a control flowchart of the same embodiment. 1...Engine, 2...Mechanical clutch, 3...
...Transmission, 5...Countershaft rotation speed sensor, 6...Transmission output shaft rotation speed sensor, 7...Subshaft rotation speed sensor, 8...Shift change actuator,
9...Shift position sensor, 10...Shift designation box, 11...Shift designation push button, 13
...Double clutch command lamp, 15...Clutch position sensor, 17...Accelerator opening sensor, 2
0...Control unit, 21...Shift change control circuit, 22...Synchronization determination circuit, 2
3...Transmission control circuit.

Claims (1)

[Scope of utility model registration request] a shift specifying means for specifying a shift gear to be used; a command means for instructing a shift change operation based on input signals from a clutch position detecting means for detecting a clutch position based on a clutch pedal position; and an accelerator opening detecting means; When the command means outputs a shift change command signal, the synchronization speed of the countershaft at the designated shift stage is compared with the actual countershaft rotation speed based on the neutral signal from the shift position detection means to determine whether synchronization has been achieved. a synchronized determination means for determining;
shift operation means for shifting to a designated shift stage when the judgment means outputs a synchronization detection signal; For a vehicle, characterized in that it is provided with a display means for displaying that an operation command has been generated and for displaying a stop of the double clutch operation command when the command means detects that a double clutch operation has been performed. Automatic transmission.