JPH0514039Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to improvement of an automatic transmission for a vehicle.

(Prior Art) In recent years, in order to reduce driver fatigue, an increasing number of vehicles are equipped with automatic transmissions that automatically change gears by interposing a torque converter between the engine and the transmission. Since the torque converter is a fluid coupling, the output transmission efficiency is inevitably lower than that of a mechanical clutch, which is disadvantageous in terms of improving fuel efficiency.

Therefore, in order to improve not only ease of operation but also fuel efficiency, we used a conventional transmission and mechanical clutch, and instead of having the driver operate the clutch or transmission, they were automatically controlled by electronic control. The applicant of the present invention has proposed an automatic transmission device in which a gear change operation is performed automatically (see, for example, Japanese Utility Model Application No. 70,610/1983).

FIG. 5 is a flowchart showing the control operation, and the basic operation is the same as the operation of an automatic transmission using a torque converter.

In this case, S13 to S20 indicate a map rewriting operation for changing the target shift stage setting (that is, the shift map) based on the vehicle speed. When the target shift stage is set by the range, the vehicle speed data is sampled, and only when the shift-up operation time is within a predetermined value after shift-up control, it is determined that the gear change has been performed properly and the map is rewritten. .

(Problem to be solved by the invention) However, in the case of such an automatic transmission, if the driver intentionally or unconsciously pulls the engine speed to the maximum speed and performs a shift change when rewriting the map. However, there was a problem in that the shift change was not performed no matter how long one waited while the vehicle was driving with an automatic gear shift based on this map.

To prevent the risk of engine overrun, the gear shift control is performed when the engine speed reaches the maximum speed for that shift stage during the circuit, or when it is determined that the maximum speed will be exceeded after the start of a shift change. This is because gear shift limiting means is provided to interrupt the shift.

(Means for solving the problem) In order to solve this problem, this invention
As shown in FIG. 1, there is provided a determining means for determining whether or not to shift gears based on a preset shift map based on a detection signal from a vehicle driving state detecting means, a means for detecting engine speed, and a means for determining whether or not to shift gears during manual shifting. means for detecting the range position of the selector and means for rewriting the shift map based on output signals from the means for instructing rewriting of the shift map; and a storage means for setting a map rewriting upper limit value lower than the maximum engine speed by a predetermined value. and a correction means for instructing map rewriting based on the map rewriting upper limit value when the engine rotation at the time of map rewriting exceeds the map rewriting upper limit value.

(Function) If the driver intentionally or unconsciously pulls the engine speed to the maximum speed and performs a shift change operation when rewriting the map, the map will be rewritten with the preset map upper limit value, and this will automatically During speed change driving, gear shift control is performed using the map upper limit value before the gear shift limiting means operates.

(Embodiment) FIG. 2 is a schematic diagram showing the mechanical configuration of an embodiment of this invention applied to a diesel engine, and FIG. 3 is a block diagram of the same. In this example, the fuel injection pump 41, mechanical clutch 42, and transmission 43 are provided with various detection means for detecting their operating states and actuators for driving them, and a microcomputer transmits information based on signals from these detection means. A control unit 60 configured therein controls the actuator to realize automatic gear shifting.

First, a means for detecting the operating state is required as a detection means, and this operating state can be determined by the engine rotation,
This can be determined from the engine load, the position of the select lever, the engagement/disengagement state of the clutch, the actual shift position of the transmission, and the vehicle speed. For this reason, the engine 36 includes a rotation sensor 70 that detects engine rotation, and an accelerator pedal 4
5 is an accelerator pedal 45 as an engine load.
The shift tower 48 has an accelerator sensor 50 that detects the pedal angle (accelerator opening), the shift tower 48 has a selector position sensor 51 that detects the position of a selector lever (selector) 49, and the mechanical clutch 42 has a selector position sensor 51 that detects the stroke amount of the clutch. The transmission 43 has a clutch stroke sensor 54 that detects the actual shift position, and a shift position sensor 58 that detects the actual shift position.
and a main shaft rotation sensor 56 that detects the rotational speed of the main shaft connected to the axle via the propeller shaft 44. Note that since the main shaft rotation speed is proportional to the vehicle speed, the main shaft rotation speed sensor 56 functions as a vehicle speed sensor.

In addition, synchronization of the gears to be meshed is achieved by driving the gear shift mechanism when the rotational speed of the main gear idling on the main shaft enters a synchronization range established with respect to the rotational speed of the mainshaft, so the main gear rotational speed is detected. There is a need to. In this case, since the main gear is in synchronous mesh with the countershaft that transmits the engine output, the rotational speed of the countershaft is equal to the rotational speed of the main gear, and therefore, the countershaft rotation sensor 57
is provided.

In addition, an auto button 72 for switching between automatic gear shifting and manual gear shifting, and a map rewriting button 73 for instructing map rewriting, which will be described later, are provided.

Next, for these detection means, the fuel injection pump 41 is an actuator that is controlled by the control unit 60, and is equipped with a control lever to drive the control lever according to the request and to match the engine rotation with the requested rotation. A governor control device 53 that controls engine rotation is connected to the clutch 4.
2 is provided with a clutch actuator 55 that engages and engages the clutch, and the transmission 43 is provided with a gear shift actuator 59 that drives the gear shift mechanism and sets a gear shift.

The control unit 60 that controls these actuators includes a synchro determination circuit 62, a transmission control circuit 64 constituting a speed change operation control means, an engine control circuit 63, a clutch engagement control circuit 65, a shift change control circuit 61,
Learning circuit 6 constituting shift map rewriting means
6. A map rewriting determination circuit 67 that determines whether or not map rewriting is to be executed based on the shift change operation time at the time of map rewriting.

Here, the synchronization determination circuit 62 determines, based on the rotation speed signals from the main shaft rotation sensor 56 and the countershaft rotation sensor 57, a rotation speed range that is above or below the main shaft rotation speed by a predetermined value as a synchronizable region. be.

In addition, the shift change control circuit 61, which plays the main function as a gear change operation control means, controls the accelerator opening sensor 50, etc. as a driving state detection means, and the main shaft rotation as a vehicle speed detection means when an auto signal is input from the auto button 72. The engine control circuit 63, transmission control circuit 64, A control signal is outputted via the clutch engagement/disengagement control circuit 65 to control the gear shift operation, and the gear shift actuator 59
At the same time as or before the set signal for performing the gear shift, a return signal for returning the engine to the state before the gear shift is output to the governor control device 53.

The learning circuit 66 rewrites the shift map set by the shift change control circuit 61 based on the detection signals of the selector position sensor 51 and engine rotation sensor 70 when a rewrite signal is input from the map rewrite button 73. In this case, a map rewriting upper limit value is set in the circuit that is a predetermined value lower than the maximum engine speed corresponding to each shift stage, and if the engine speed at the time of map rewriting exceeds this upper limit value, Executes map rewriting with upper limit value.

Although the control unit 60 is not shown, in order to prevent the risk of engine overrun, as in the past, when the engine speed reaches the maximum speed, or when it is determined that the maximum speed will be exceeded after the start of a shift change, A gear shift limiting means is provided for interrupting gear shift control.

In this example, so that the clutch operation can be performed manually, a clutch pedal switch 67 detects that the clutch pedal 46 is depressed, and the accelerator opening degree of the accelerator pedal 45 is directly controlled by the fuel injection pump 41. A switching device 68 is provided which communicates with the lever.

Further, 69 is a transmission position lamp that indicates the actual shift position.

FIG. 4 is a flowchart illustrating the operations performed by the control unit 60, and the numbers in the figure indicate processing numbers.

The main part of this idea is S20 during map rewriting operation.
21, when the engine rotation exceeds the map rewriting upper limit value corresponding to the current shift position, the shift map is rewritten using this upper limit value.

That is, when rewriting the shift map, the driver performs a shift change operation using the shift selector 49 with the auto button 72 turned off (manual shift driving) and the map rewriting button 73 turned on. If the driver intentionally or unintentionally pulls the engine speed to the maximum speed for that shift stage and performs a shift change operation, the map will be rewritten using the engine speed at that time, that is, the vehicle speed. Instead, rewriting is performed using the map rewriting upper limit value, so that problems such as gear shift control being interrupted during automatic speed change driving based on this shift up and no shift change operation being performed forever can be avoided.

(Effect of the invention) In short, according to this invention, if the driver intentionally or unconsciously pulls the engine speed to the maximum rotation speed at that shift stage and changes the gear when rewriting the map, the engine speed will be lower than the maximum engine speed. Since the map is rewritten with the map rewriting upper limit value set lower by a predetermined value, interruption of shift change control during automatic transmission driving based on this shift map is avoided, and good driving performance is ensured. This has the effect of

[Brief explanation of the drawing]

Fig. 1 is a diagram corresponding to the claims of this invention, Fig. 2 is a schematic configuration diagram showing an embodiment of this invention, Fig. 3 is a block diagram as well, Fig. 4 is a flowchart showing an example of control operation, and Fig. 5 is a flowchart showing an example of control operation. It is a flowchart explaining the control operation of a prior application. 36... Engine, 37... Clutch disconnection means, 38... Mechanical clutch, 39... Gear shift means, 40... Transmission, 41...
Fuel injection pump, 42... clutch, 43... transmission, 49... selector, 50...
Accelerator opening sensor, 51... Selector position sensor, 53... Governor control device, 54... Clutch stroke sensor, 55... Clutch actuator, 56... Main shaft rotation sensor, 57
... Counter shaft rotation sensor, 58 ... Shift position sensor, 59 ... Gear shift actuator, 60 ... Control unit, 61 ... Shaft change control circuit, 62 ... Synchro determination circuit, 63 ... Engine control circuit, 64... Transmission control circuit, 65... Clutch intermittent control circuit, 66... Learning circuit, 67... Map rewriting determination circuit, 70... Engine rotation sensor, 7
2...Auto button, 73...Map rewrite button.

Claims (1)

[Scope of utility model registration request] A determining means for determining whether or not to shift based on a preset shift map based on a detection signal from a vehicle driving state detecting means, a means for detecting engine speed, a means for detecting a range position of a shift selector, and rewriting of the shift map. means for rewriting the shift map during manual gear shifting based on an output signal of the means for instructing; a storage means for setting a map rewriting upper limit value lower by a predetermined value than the maximum engine rotation speed; an automatic transmission device for a vehicle, comprising a correction means for instructing map rewriting based on the map rewriting upper limit value when the map rewriting upper limit value is exceeded.