JP3348621B2 - Transmission control device for continuously variable transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a shift control device for a continuously variable transmission.

[0002]

2. Description of the Related Art As a conventional shift control device for a continuously variable transmission, there is one as disclosed in Japanese Patent Application Laid-Open No. 8-82354.

[0003]

However, in such a conventional shift control device for a continuously variable transmission, there is a problem that a shift shock varies depending on a vehicle driving state when a driver selects a shift speed. was there. The present invention
The purpose of the present invention is to solve the above-mentioned problems by making the shift speed variable depending on the vehicle driving state when the driver selects the gear position. I have.

[0004]

Means for Solving the Problems As means for achieving the above object, a shift control device for a continuously variable transmission according to the present invention includes: a normal mode in which a speed ratio is steplessly controlled; In the continuously variable transmission having the manual mode for controlling, the larger the change in the input shaft speed obtained from the difference between the input shaft speed at the time when the driver has selected the gear and the target input shaft speed at the selected gear, the larger the change. The gear speed has been reduced.

[0005]

Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a control system of a shift control device for a continuously variable transmission according to an embodiment of the present invention. First, the configuration will be described. The throttle opening TVO, the engine speed Ne, the input shaft speed Nt, the output shaft speed No, and the shift signal are input to the CVT control unit.

FIG. 2 is a diagram showing an example of a target rotation map at each shift speed with a constant speed ratio set in the continuously variable transmission. The horizontal axis is the vehicle speed Vsp, and the vertical axis is the target input shaft rotation speed tNt.
Then, the target input shaft speed tNt is searched based on the selected shift speed and the vehicle speed Vsp.

When the driver issues a shift command in a manual mode in which the driver selects and operates a predetermined constant gear ratio, a change in the input shaft speed ΔNt corresponding to the vehicle speed Vsp at that time occurs (FIG. 3). Time d required for shifting regardless of driving conditions
Assuming that t is constant, when the vehicle speed Vsp is low, the input shaft rotation speed change speed dNt / dt is low, but when the vehicle speed Vsp is high, the input shaft rotation speed change speed dNt / dt is high, and the shift shock becomes large (FIG. 4).

The present invention solves the above-mentioned problem. When the change in the input shaft rotation speed dNt during a gear shift is large, the change in the angular speed dω / is achieved by reducing the shift speed di / dt.
dt is reduced, and the shock caused by torque fluctuation during gear shifting is reduced.

FIG. 5 shows a flowchart of the present embodiment. The target input shaft rotation speed tNt at the time of shifting is determined by the following equation.

(Equation 1) Next, the operation will be described. The input shaft rotation speed change speed dNt / dt and the associated shift shock are predicted from the input shaft speed Nt when the driver selects the shift speed and the selected shift speed, and preset so that the shift shock is constant. The selected shift speed is selected.

[0010]

As described above, according to the present invention, a shift control device for a continuously variable transmission in which a shift speed is variable depending on a vehicle operating state when a driver selects a shift speed, It is possible to obtain an effect that it is possible to reduce discomfort at the time of shifting and to give an appropriate shift shock to the driver as information.

[Brief description of the drawings]

FIG. 1 is a diagram showing a control system of a shift control device for a continuously variable transmission according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a target rotation map at each gear stage having a constant gear ratio set for a continuously variable transmission.

FIG. 3 is a diagram showing a relationship between a vehicle speed and a rotational speed change allowance when shifting is performed between fixed speed ratios set in a continuously variable transmission.

FIG. 4 is a diagram showing the effect of the present embodiment.

FIG. 5 is a flowchart illustrating the present embodiment.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ identification code FI F16H 63:06 F16H 63:06 (58) Investigated field (Int.Cl. ⁷ , DB name) F16H 59/00-61/12 F16H 61/16-61/24 F16H 63/40-63/48 F16H 9/00

Claims (1)

(57) [Claims] 1. A normal mode in which a gear ratio is steplessly controlled;
In the continuously variable transmission having a manual mode in which a gear ratio is controlled in a stepwise manner, when the manual mode is selected, the input shaft speed at the time when the driver selects the gear and the target input shaft speed at the selected gear. A speed change control device for a continuously variable transmission, characterized in that the speed change speed is reduced as the change in the input shaft rotation speed obtained from the difference between the speed changes.