JPH0444440Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Technical field of the invention The invention relates to an automatic transmission for a vehicle, and in particular:
The present invention relates to an automatic transmission for a vehicle that controls engine rotation, a clutch, and a transmission in accordance with the operation of a shift tower that commands a shift change, and performs a gear shift based on a shift change command.

(b) Prior art and problems In recent years, position sensors and actuators for operation have been added to ordinary mechanical clutches and transmissions, respectively, as automatic transmission devices to improve the ease of driving and fuel efficiency of automobiles.
Semi-automatic systems have been proposed in which these actuators are controlled by clutch and transmission control means (for example, Utility Model Application No. 59-70608
number, etc.).

This type of transmission has a shift tower and an automatic shift designation switch that command the shift positions of 1st to 6th speeds and reverse by lever shift and selection operations, and when the automatic transmission designation switch is turned on, the clutch transmission is activated. The control means is configured to automatically shift up or down based on automatic shift data and vehicle speed stored within the control means.

For example, when a shift gear is commanded, the synchro engine rotation speed for the new shift gear according to the command is calculated based on the vehicle speed, and control is performed to raise or lower the engine speed to the synchro engine rotation speed. It is configured to perform gear shift control when the rotational speed is reached.

However, in conventional devices, in order to prevent engine overrun, when the synchro engine speed exceeds the limit, gear shift control using a downshift command is stopped and the original gear is set again. was. Therefore, if a downshift command is issued while driving downhill, etc., and the synchronized engine speed exceeds the limit, the original gear will remain set, and engine braking will not be applied. In some cases, it was not possible to immediately shift the vehicle to a deceleration state.

(c) Purpose of the invention The present invention was made in view of the above-mentioned conventional problems, and its purpose is to provide an automatic transmission for vehicles that can actuate the engine brake by gear shift control regardless of the vehicle speed in an emergency. The goal is to provide equipment.

(d) Structure of the invention In order to achieve the above object, the present invention provides a vehicle that controls engine rotation, a clutch, and a transmission in response to the operation of a shift tower, and performs a gear shift based on the operation of the shift tower. In an automatic transmission, an emergency command means that commands operation in an emergency state by operation, and a calculation that calculates the synchronized engine rotation speed at a new shift gear based on vehicle speed when a shift change is commanded by operating a shift tower. When the calculated value of the means and the calculation means is within the set value range suitable for shift change, gear shift control is performed according to the shift change command, and when the calculated value is outside the set value range, the shift is performed before the shift change command is generated. and control means for performing control to fix the gear in the position, and the control means increases the upper limit of the set value suitable for the shift change when an emergency command occurs, compares it with the calculated value, and adjusts the set value according to the result of this comparison. This is an automatic transmission device for a vehicle that performs gear shift control and controls to increase the engine speed to an allowable range.

(e) Embodiments of the invention Hereinafter, preferred embodiments of the invention will be described based on the drawings.

1 and 2 are hardware configuration and control block diagrams of an embodiment of the present invention. In the figure, a transmission 13 is attached to an engine 11 via a mechanical clutch 12, and its output shaft is connected via a propeller shaft 14 to a rear axle (not shown). Further, the engine 11 is provided with a fuel injection pump 15 .

The clutch 12 is equipped with a clutch stroke sensor that detects whether the clutch is disengaged or engaged, that is, whether it has entered the range A (connected state) or the range C (disengaged state) in FIG. 3 based on its stroke amount. 16 and
For example, a clutch actuator 17 for driving the clutch is equipped with a valve. Furthermore, the third
The range B in the figure is a half-clutch state.

The transmission 13 also includes a countershaft rotation sensor 18 that detects the rotation speed of the countershaft, a vehicle speed sensor 19 that detects the rotation speed of the output shaft, and a transmission actuator that shifts the transmission 13. A shift position sensor 21 is provided to detect the shift position of the yuator 20 and the transmission 13. 22 is a clutch pedal position sensor that detects the position of the clutch pedal 23, 24 is an accelerator pedal, and 25 is an accelerator switching device.

Reference numeral 26 is a shift tower installed in the driver's cab that commands the shift stage during a shift change.As shown in Fig. 4, the shift lever 26a can be used to select between reverse R, auto A, 6 ranges from 1st to 6th gear, and A total of 9 ranges, including neutral N, can be selected, and there is a switch inside for each range. An emergency button 26A is provided above the knob of the shift bar 26a to be operated in an emergency. Further, three shift pattern changeover switches 26c ₁ to ₃ are provided on one side of the housing 26b of the shift tower 26.

On the other hand, clutch 12 and transmission 1
Control unit 27 that controls 3
is a shift change control unit 28 that issues a shift change command when shift change requirements are satisfied (when a shift designation operation, etc. is performed normally) based on signals from the shift tower 26 and clutch pedal position sensor 22; When the shift change command is output from the shift change control unit 28, the synchronization speed at the specified shift stage is determined based on the signal from the shift position sensor 21 and the input from the vehicle speed sensor 19 of the transmission 13. A synchronization determination section 29 that calculates the synchronization state and compares the calculated value with the rotation speed (current rotation speed) measured by the countershaft rotation speed sensor 18 to determine the synchronization state; a transmission control section 31 which receives a detection signal and issues a drive signal via the transmission actuator 20 and a heli box 30; and the shift change control section 28.
clutch actuator 17 based on the command from
and an engine control section 33 that controls the accelerator switching device 25 to switch accelerator operation from manual to automatic when a shift change command is output.

The shift change control section 28 outputs an alarm signal to the transmission error lamp 34 or the clutch error lamp 35 when a malfunction occurs in the shift change operation. The shift change control unit 28 also causes a shift completion lamp 37 to indicate shift completion and double clutch instruction when the shift change operation is completed, and a double clutch command lamp 38 to indicate shift completion and double clutch instruction when the clutch operation and accelerator operation are switched to manual. case buzzer 3
6, each sends a signal.

In addition, 39 and 40 are the ON relay of the electric brake (exhaust brake) used to quickly obtain synchronization of the transmission 13, and the temporary relay when performing a shift change operation while manually operating the electric brake. 41 is a transmission position indicator that displays the transmission position; 42 is a reset button that resets the shift completion lamp 37, buzzer 36, etc.

The present embodiment has the above-mentioned configuration, and its operation will be explained next based on the flowchart of FIG. 5.

First, shift lever 26a of shift tower 26
When a downshift is specified by the operation, the shift change control section 28 performs processing to set the target shift gear to the selector command gear (step 100), and the process moves to step 102. In step 102, it is determined whether the current shift gear and the target shift gear match based on the output of the shift position sensor 21, and if the determination is YES, the processing in this routine is terminated, and the determination is NO. If so, the process moves to step 104. In step 104, the synchro rotation speed of the target shift stage is calculated based on the output of the vehicle speed sensor 19,
The process moves to step 106. In step 106, it is determined whether or not the emergency button 26A has been turned on. If the determination is NO, the process moves to step 108, and if the determination is YES, the process moves to step 110.

In step 108, it is determined whether Nsyc<Nmax2, and if the determination is NO in this step, the process moves to step 112, and if the determination is YES, the process moves to step 114. That is, when the determination in step 108 is YES, shift stage control is performed, and when the determination is NO, control is performed to fix the gear at the shift position before the shift change command was issued.

On the other hand, in step 110, Nsyc<Nmax1
A determination is made as to whether or not this step is true, and if the answer is YES, the process moves to step 114, and if the answer is NO, the process moves to step 112. That is, when the emergency button 26A is turned ON and an emergency command is generated, the setting value suitable for the shift change specified for normal downshifting is changed.
The set value Nmax1, which is a higher upper limit value of Nmax2, is compared with the synchro engine rotation speed Nsyc. If Nmax1 is greater than Nsyc, downshift control is performed, and if it is smaller, the gear is shifted to the shift position before the shift change command was generated. Performs fixed control.

When the downshift control is activated in step 114, the process moves to step 116, where a command to turn off the clutch is issued to the clutch actuator 17, and the process moves to step 118. Step 118
At step 1, a command to set the transmission to neutral is given to the transmission actuator 20 via the relay box 30, and the process moves to step 120. In step 120, a command is given to the clutch actuator 17 to turn on the clutch, and the process proceeds to step 122. At step 122, a command to fully open the accelerator is given to the accelerator switching device 25, and the process moves to step 124.

In step 124, it is determined whether the emergency button 26A is ON or not. If the determination is NO in this step, the process moves to step 126, and continues in step 122 until the synchro engine rotation speed Nsyc becomes equal to or less than the gear rotation speed Ng. 124 continues.

On the other hand, if the determination in step 124 is YES, the process moves to step 128, where a command is given to the governor control actuator 44 to increase the engine speed to an allowable range, and the process moves to step 130.
In step 130, synchro engine speed
Step until Nsyc becomes less than gear rotation speed Ng
Processes 122, 124, and 128 are continued. If the determination in step 130 is YES, the process moves to step 132 and the governor control actuator is activated.
It is turned off and the process moves to step 134. In the process of step 134, the accelerator switching device 25
A command is given to return the accelerator to its original position, and the process moves to step 136. In step 136, a command is sent to the transmission actuator 20 via the relay box 30 to change the gear to the gear according to the operation of the shift tower 26, and the step is repeated.
Return to processing 100.

(F) Effect of the invention As explained above, according to the invention, when an emergency command occurs, the upper limit of the set value suitable for shift change is increased and compared with the synchro engine rotation speed at the new shift stage, and the comparison result is In addition to performing gear shift control according to
The excellent effect of contributing to the improvement of safe driving can be obtained.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing one embodiment of the present invention;
The figure is a block diagram of Figure 1, Figure 3 is a diagram showing the operating characteristics of the clutch stroke sensor, Figure 4 is a perspective view of the shift tower, and Figure 5 is a diagram for explaining the operation of the device according to the present invention. It is a flowchart. 11...Engine, 12...Clutch, 13...
...Transmission, 19...Vehicle speed sensor, 2
6...Shift tower, 26A...Emergency button, 27...Control unit, 28...
...Shift change control section, 29...Synchronization determination section, 31...Transmission control section, 32...
...Clutch engagement control section, 33... Engine control section, 44... Governor control actuator.

Claims (1)

[Scope of utility model registration request] Engine rotation in response to shift tower operation,
In a vehicle automatic transmission that controls a clutch and transmission and performs gear shifts based on the operation of a shift tower, there is an emergency command means that commands operation in an emergency state by operation, and a shift change that is commanded by operation of the shift tower. a calculation means that calculates the synchronized engine rotation speed at a new shift stage based on the vehicle speed when the synchronized engine speed is changed, and a gear shift control that follows the shift change command when the calculated value of the calculation means is within a set value suitable for the shift change. and control means for controlling the gear to be fixed at the shift position before the shift change command is generated when the calculated value is outside the range of the set value, and the control means performs a setting suitable for the shift change when the emergency command is generated. An automatic transmission device for a vehicle, characterized in that the upper limit value of the value is increased and compared with the calculated value, and gear shift control is performed according to the comparison result, and control is performed to increase the engine speed to an allowable range. .