JP2788255B2 - Mode switching control method for electronically controlled automatic transmission - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a control method for switching from an economy mode to a power mode in an electronically controlled automatic transmission to a mode in which the power is increased.

2. Description of the Related Art Conventionally, in an electronically controlled automatic transmission, when selecting a gear position in switching between traveling modes, each traveling mode has its own shift point, and the vehicle speed, throttle opening, and shift points of each traveling mode. , The gear speed is determined.

(Problems to be Solved by the Invention) However, even when the driving mode is normally switched from the driving mode to the driving mode in which the power is increased (from the high-speed economy mode to the high-speed power mode), the gear position of the fourth gear is changed due to the shift point. In a region where the power remains unchanged, it is contrary to the driver's intention to increase the power, that is, to downshift, so that there is a discrepancy between the driving state of the vehicle and the driver's request, which causes the driver to feel uncomfortable. there were.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a mode switching control in an electronically controlled automatic transmission capable of switching to a driving mode in which power is increased independently of a shift point in an automatic transmission. The aim is to provide a method.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a mode switching control method for an electronically controlled automatic transmission, in which when a traveling mode is switched from an economy mode to a power mode, a gear position is changed. If the speed does not change while maintaining the fourth speed, the downshift is forcibly performed for a certain period of time.

(Operation and Effect of the Invention) According to the present invention, since the configuration is as described above, when switching the driving mode from the economy mode to the power mode when switching the driving mode to the driving mode in which the power is further increased, If the speed does not change while maintaining the fourth speed, it is possible to shift to a running state in which the power is further increased by forcibly downshifting for a certain period of time.

Therefore, it is possible to forcibly shift to the driving mode in which the power is increased, which meets the driver's request.

By appropriately shifting to the running mode in which the power is increased, a smooth running in accordance with the actual running state can be performed.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic block diagram of a control device of an electronically controlled automatic transmission showing an embodiment of the present invention, and FIG. 2 is a flowchart showing a mode switching control method of the automatic transmission showing an embodiment of the present invention.

In FIG. 1, 1 is a throttle sensor, 2 is a vehicle speed sensor, 3 is a shift position switch, 4 is a mode changeover switch between power and economy, 5 is a first shift solenoid, 6 is a second shift solenoid, 7 is a solenoid for hydraulic control, 8 is a display device showing mode switching control in an electronically controlled automatic transmission, 10 is an electronic control unit (ECT), 11 is a CPU (central processing unit), 12 is ROM, and 13 is RA
M, 14 to 17 are input processing circuits, 18 is an input interface circuit, 19 is an operation timer circuit, 20 is an input / output (I / O) interface circuit, 21 is a drive circuit for the first speed-changing solenoid 5, and 22 is A monitor circuit for the first shift solenoid 5, a drive circuit 23 for the second shift solenoid 6, a monitor circuit 24 for the second shift solenoid 6, a drive circuit 25 for the hydraulic control solenoid 7, and a reference numeral 26 5 is a driving circuit of the display device 8.

Next, a mode switching control method of the automatic transmission will be described with reference to FIG.

 Check if it is in the D range.

In the case of the D range, it is checked whether or not the power mode is currently set.

In, if the current mode is the power mode, it is checked whether or not the economy mode was set before the power mode.

In, if you were in economy mode,
It is already checked whether the power mode is a new power mode in which the power increases (switched power mode).

In, if it is not the new power mode,
Check if it is 4th speed.

In the case of the fourth speed, it is checked whether or not the vehicle speed is lower than the kickdown fourth speed to the third speed down point.

In the case where the vehicle speed is lower than the kickdown 4th speed to the 3rd speed down point, the vehicle is set to the new power mode and the timer is started (the arithmetic timer circuit 19 is started).

The power mode 4th to 3rd speed down point is set in the normal pattern DDSFT (RAM value).

 Determine whether the vehicle speed is faster than DDSFT.

If the vehicle speed is faster than DDSFT, the timer checks whether a predetermined time X seconds (for example, 5 seconds) has elapsed.

When a predetermined time X seconds has elapsed from the timer, the new power mode is released.

If the timer has not passed the predetermined time X seconds, it is checked whether the destination is the fourth speed.

 If the destination is the fourth speed, the downshift is performed.

If the destination is not the fourth speed, it is checked whether the destination is the third speed.

If the destination is the third speed, upshifting is prohibited.

By controlling in this manner, the driver switches to the new power mode in which the vehicle is forcibly downshifted for a certain period of time even in the driving state in which the vehicle only switches from the economy mode to the power mode and there is no shift in the gear stage in the fourth speed. As a result, the running torque can be increased, and the diversified needs of the user can be accurately met.

It should be noted that the present invention is not limited to the above embodiments, and various modifications are possible based on the gist of the present invention, and they are not excluded from the scope of the present invention.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of a control device for an electronically controlled automatic transmission showing an embodiment of the present invention, and FIG. 2 is a flowchart showing a mode switching control method showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Throttle sensor, 2 ... Vehicle speed sensor, 3 ... Shift position switch, 4 ... Mode changeover switch, 5 ... First shift solenoid, 6 ... Second shift solenoid, 7 ... Hydraulic pressure Control solenoid, 8 Display device, 10 Electronic control unit (ECT), 11 CPU (Central processing unit), 12 ROM, 13 RAM, 14 to 17 Input processing circuit, 18 …… Input interface circuit, 19 …… Operation timer circuit, 20 …… Input / output (I / O) interface circuit, 2
1... Drive circuit for the first shift solenoid, 22.
Monitor circuit for solenoid for shifting gears, 23 ... Drive circuit for solenoid for second gear shifting, 24 ... Monitor circuit for solenoid for shifting gears, 25 ... Drive circuit for solenoid for hydraulic control, 26 ... Display device Drive circuit.

Claims (1)

(57) [Claims] 1. A mode switch in an electronically controlled automatic transmission, wherein when the drive mode is switched from the economy mode to the power mode, the downshift is forcibly down for a certain period of time if the gear position remains unchanged at the fourth speed. Control method.