Interrelated power delivery controls – including engine control – Transmission control – With brake control
Reexamination Certificate
2001-11-13
2003-11-25
Marmor, Charles A. (Department: 3681)
Interrelated power delivery controls, including engine control
Transmission control
With brake control
C477S092000, C192S220000
Reexamination Certificate
active
06652416
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for controlling shifts of an auto vehicle transmission and more particularly to a method for controlling shifts of an auto vehicle transmission which reduces a shifting shock generated at the time of a R→D range switch of the shift lever to run the vehicle forwards while it is running backwards.
2. Brief Description of the Related Art
In general, an auto transmission of a vehicle has a transmission control unit (hereinafter referred to as TCU) to automatically control a transmission rate according to the running speed and load of a vehicle.
At this time, the TCU controls the revolution number of an output terminal of a planetary gear apparatus by controlling a plurality of clutches and a brake installed at a gear train to an operational or non-operational state.
In controlling the output terminal, the TCU outputs a transmission rate controlling duty control signal, which shifts an auto transmission of a vehicle without a shock according to predetermined program processing steps when signals of various sensors to be variably output according to the running state of a vehicle to a solenoid valve which controls the oil pressure of a plurality of clutches and a brake installed at the gear drain, thereby controlling the duty of the solenoid valve and turning on or off.
First of all, in
FIG. 1
, C
1
, C
2
, C
3
, C
4
and C
5
respectively designate rear clutch (R/C), front clutch (F/C), low reverse brake (L/R-B), end clutch (E/C) and kick down servo (K/D).
Also, reference numerals
31
,
32
,
33
,
34
and
35
respectively designate oil pressure control solenoid valve-A (PCSV-A), oil pressure control solenoid valve-B (PCSV-B), shift control solenoid valve-A (SCSV-A), shift control solenoid valve-B (SCSV-B) and shift control solenoid valve-C (SCSV-C).
Furthermore, reference numerals
40
,
41
,
42
,
50
,
51
,
52
,
53
and
54
respectively designate manual valve (M/V), pressure control valve-A (PCV-A), pressure control valve-B (PCV-B), shift control valve (SCV), rear clutch exhaust valve (R/C Ex-v),
2
-
3
and
3
-
4
shift valve (
2
-
3
&
3
-
4
S/V), control shift valve (CSV) and fail safe valve (FSV).
In the auto transmission thus constructed of the prior art, when a driver wants to change the shift lever from the backward running ‘R’ range to the forward running ‘D’ range while the vehicle is running backwards at a low speed, the front clutch C
2
and low reverse brake C
3
function as combination elements to perform the backward running.
When a driver wants to change the shift lever to the forward running ‘D’ range, the front clutch C
2
and low reverse brake C
3
are released, and the rear clutch C
1
and kick down servo C
5
function as combination elements to perform the forward running. At this time, a kick down band is firstly fastened with the supply of line pressure to the combined side of the kick down servo C
5
, and, then, the line pressure of the rear clutch C
1
is gradually raised to complete the control of a shift to the second running speed of the vehicle.
However, there is a problem in the prior art in that severe rolling and shift shock occur by an instantly stopping vehicle as one way clutch (OWC) is turned to its reverse direction when the rear clutch is suddenly fastened to the kick down band of the kick down servo C
5
.
SUMMARY OF THE INVENTION
It is an object of the present invention to solve the aforementioned problems and provide a method for controlling shifts of an auto vehicle transmission to perform forward running after a forward running shift is determined in consideration of operational states such as a driver's manipulation of a brake pedal, engine idle and backward running speed at the time of a R→D range switch of the shift lever according to a backward driving driver's intention to run forwards.
In order to accomplish the aforementioned object of the present invention, there is provided a method for controlling shifts of an auto vehicle transmission, the method comprising the steps of:
discriminating whether a R→D range switch signal has been input while the vehicle is running backwards;
detecting the vehicle's running state if the R→D range switch signal has been input;
discriminating whether the first speed shifting conditions are satisfied when the detected running states of the vehicle have been determined as follows: a brake switch is turned off, and the running speed is greater than 0 Kph; and
performing the first shifting process if all the first speed shifting conditions have been fully satisfied.
REFERENCES:
patent: 5046178 (1991-09-01), Hibner et al.
patent: 5216606 (1993-06-01), Lentz et al.
patent: 5795262 (1998-08-01), Robinson
patent: 5833572 (1998-11-01), Leising et al.
patent: 6325742 (2001-12-01), Lee
patent: 6358184 (2002-03-01), Steinmetz et al.
patent: 6464617 (2002-10-01), Lee
Abdelnour Dennis
Hyundai Motor Company
Marmor Charles A.
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