JPH0423147B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electronic automatic transmission control device that electronically controls the gear ratio of a vehicle transmission and the operation of a lockup mechanism of a torque converter.

[Conventional technology]

Conventionally, this type of control device detects the traveling speed of the vehicle and the throttle opening of the engine load, determines the shift position based on a preset shift pattern based on the correlation between the two detection signals, and then determines the shift position based on the determination. It issues a shift command signal for upshifting or downshifting, energizes the shift solenoid, and controls the switching of the gear ratio of the transmission. Furthermore, the shift pattern has patterns corresponding to each mode: a normal driving mode, a power driving mode in which driving is performed with high torque, and an economy driving mode in which driving is performed with low torque. In addition, it has a lock-up pattern that controls the operation of the lock-up mechanism that directly connects the input and output shafts of the torque converter corresponding to each mode. mode, the lockup pattern becomes a very narrow lockup area. Each mode is determined by operating a manual switch.

[Problem to be Solved by the Invention] Therefore, if the automatic constant speed driving device is set to maintain the vehicle speed at the set vehicle speed while the driving mode is set to power driving mode, the vehicle will not be able to drive with low torque. Although it is good, it results in high-torque driving, and furthermore, the lock-up area remains extremely narrow, resulting in inefficient driving control.

The present invention is intended to solve the above-mentioned problem, and aims to receive a constant speed driving signal from an automatic constant speed driving device and to always maintain highly efficient automatic variable control at that time.

In order to achieve this object, the present invention includes: a storage means for storing a plurality of lockup patterns predetermining the operation of the lockup mechanism; a selection means for selecting one from the plurality of lockup patterns; a determining means for determining whether or not the vehicle is traveling at a constant speed upon receiving a signal indicating that the vehicle is traveling at a constant speed from an automatic constant speed traveling device that maintains the speed constant; and, when the determining means determines that the vehicle is traveling at a constant speed, a selection device Priority is given to the selection by the above method, and a technical means is adopted which includes a setting means for setting a lockup pattern among a plurality of lockup patterns in which the operating range in which the lockup mechanism operates is wide.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings.

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

In FIG. 1, reference numeral 1 is an automatic shift control circuit with a lockup equipped with a microcomputer, which detects the current vehicle load and running speed using a throttle sensor 2 and a vehicle speed sensor 3, and controls the shift position and the operation of the lockup mechanism. It has a function that is determined by a discrimination process based on a predetermined shift pattern and lockup pattern. Reference numeral 4 denotes a mode selection switch (selection means) set to allow the driver to select a driving mode, such as normal driving mode, power driving mode, economy driving mode, etc.

Reference numeral 5 denotes an automatic constant speed traveling device, which has a function of transmitting to the automatic speed change control circuit 1 that constant speed traveling control is in progress. Reference numerals 6 and 7 indicate first and second shift solenoids that control the oil pressure within the transmission 9 to operate a gear shift;
Perform step-shifting. Reference numeral 8 designates a lock-up solenoid that controls on and off the hydraulic pressure for driving a clutch directly connected to the input and output shafts of the torque converter 10, and is in a lock-up state when energized.

The memory (ROM) of the microcomputer in the automatic shift control circuit 1 stores various shift patterns corresponding to the power drive mode, normal drive mode, and economy drive mode, as well as lock-up patterns corresponding to each mode. Each pattern is selected according to the operation of the mode selection switch 4, and automatic gear change control is performed.

Next, the operation of the above configuration will be explained with reference to the flowchart of FIG. 2.

First, during normal driving, shift change, lock-up on, and off are performed by inputting the loaded running speed of the vehicle to the automatic shift control circuit 1 using the throttle sensor 2 and vehicle speed sensor 3 in the signal input step, and then automatically constant speed in the constant speed running step. It is determined whether a constant speed traveling signal from the traveling device 5 is being received. (Determination means) If the determination result is negative and the vehicle is not running at a constant speed, the process proceeds to a normal mode determination step, and the shift pattern and lock-up pattern selected by the mode selection switch 4 are then set.

That is, if the mode selection switch 4 has selected the normal mode, the determination result in the normal mode determination step becomes affirmative, and the normal mode is set. If the mode selection switch 4 is selected to the power mode, the determination result in the normal mode determination step is negative, and the determination result in the power mode determination step is positive, and the power mode is set. If the determination result in the power mode determination step is negative, the economy mode is set. (Setting means) On the other hand, when a constant speed driving signal indicating constant speed driving is received from the automatic constant speed driving device 5, the determination result of the constant speed driving step becomes affirmative, and priority is given to the pattern selection by the mode selection switch 4. The automatic transmission control circuit 1 is unconditionally set to the economy mode, that is, the driving mode in which the lock-up area is widened in the shift and lock-up pattern of the automatic shift control circuit 1, and the pattern has the minimum torque and the best fuel economy.

At this time, the operation (control) of the automatic constant speed traveling device 5
This is due to small load fluctuations on the vehicle, and considering that the information from the mode selection switch 4 through which the driver selects the driving mode is mainly for improving drivability, automatic constant speed driving is possible. The need for high torque driving conditions (lock-up-off or driving in a low gear) during operation of the device 5 is considered to be small.

That is, while the automatic constant speed traveling device 5 is in operation,
Regardless of the information on the mode selection switch 4, the microcomputer determines and executes the selection of the economy mode with the minimum torque and best fuel consumption pattern, thereby improving fuel efficiency.

Note that in the above embodiment, the mode selection switch 4
Although we have shown a system in which various driving modes are manually selected, it is also possible to correspond to each mode by detecting, for example, conditions such as the amount of accelerator depression, the pedaling speed, or other load fluctuation factors, and making judgments within the automatic shift control circuit 1. The shift pattern and lockup pattern to be used may be automatically selected.

〔Effect of the invention〕

As described above, in the present invention, even if a certain lockup pattern is selected by the selection means, if the lockup pattern selected by the selection means is determined to be running at a constant speed upon receiving a signal indicating that the vehicle is running at a constant speed, the lockup pattern selected by the selection means is selected. Since the structure is equipped with a setting means for setting a lock-up pattern that widens the lock-up area with priority over a shift-up pattern, driving in a lock-up state is more likely to occur when driving at a constant speed, and automatic shift control is always maintained at a high efficiency. This has the excellent effect of reducing fuel consumption.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention;
FIG. 2 is a flowchart showing the calculation process. 1... automatic transmission control circuit forming control means, 2...
...Throttle sensor, 3...Vehicle speed sensor, 4...
Mode selection switch, 5... automatic constant speed traveling device,
6... First shift solenoid, 7... Second shift solenoid, 8... Lock-up solenoid forming a lock-up mechanism, 9... Transmission, 10... Torque converter.

Claims (1)

[Scope of Claims] 1. A torque converter and a transmission are connected to the engine to transmit driving force to the wheels, and a lock-up mechanism is provided for locking up the torque converter, and the lock-up mechanism is provided to lock up the torque converter, and to lock up the transmission based on the detection of the running state of the vehicle. An electronic automatic transmission control device including a control means for electronically controlling the gear ratio and the operation of the lock-up mechanism, comprising: a storage means for storing a plurality of lock-up patterns predetermining the operation of the lock-up mechanism; a selection means for selecting one of the up patterns; and a determining means for determining whether or not the vehicle is traveling at a constant speed upon receiving a signal indicating that the vehicle is traveling at a constant speed from an automatic constant speed traveling device that maintains a constant traveling speed. , a setting means for setting a lock-up pattern in which the lock-up mechanism operates in a wider operating range among the plurality of lock-up patterns, giving priority to the selection by the selecting means, when the determining means determines that the vehicle is running at a constant speed; An electronic automatic transmission control device comprising: 2. The electronic automatic transmission control device according to claim 1, wherein the selection means comprises a manually operated selection switch.