KR19980060136A - Shift control method of automatic transmission - Google Patents

Abstract

The present invention relates to a shift control method of an automatic transmission. When the vehicle starts to travel and the speed change stage starts at the low speed during the rapid brake driving during the high speed driving, the '9' check subroutine starts, and the vehicle speed (V) is maximum (B). Determining whether or not the purge rule 9 having the maximum throttle change ΔTh is established; Determining whether a predetermined time has elapsed when the purge rule 9 is established; Determining whether the mode check variable MDCHK5 is set to 1 to determine whether the control stage 5, which is a deceleration control mode by rapid brake operation, is set when the speed change stage is low, when the time set above has elapsed; When the mode check variable MDCHK5 is set to 1, determining whether the fuzzy rule 10 is satisfied; When the purge rule 10 is established in the above manner, the driver determines that the rapid brake is operated during high-speed driving while the shift stage is at the lower stage, and sets the mode check variable MDCHK5 to 1, and a purge for preventing hunting during the uphill driving of the vehicle. Determining whether rule 1 is true; In the case where the vehicle establishes the purge rule 1 for preventing hunting while driving uphill, the braking distance of the vehicle may be shortened when the rapid brake is operated during a high speed while the shift stage of the control mode 1 for driving the hunting mode on the uphill is low. Comprising the control mode 5 processing subroutine for performing the step, the upshift is prevented during the rapid brake drive during high-speed driving in the state of the low gear stage to shorten the braking distance of the vehicle to increase the durability of the vehicle, There is an effect that can improve the stability.

Description

Shift control method of automatic transmission

The present invention relates to a shift control method of an automatic transmission, and more particularly, in a vehicle equipped with an automatic transmission, a braking distance of the vehicle is shortened by prohibiting an upshift during sudden braking due to an accident during high-speed driving at a lower speed of the shift stage. In accordance with the present invention, the present invention relates to a shift control method of an automatic transmission for increasing durability of a vehicle and improving driving performance. The shift control apparatus is configured to control a rotational force of a fluid and to operate a corresponding shift gear according to an operating state of a vehicle. The hydraulic pressure acts on the corresponding valve according to the control signal applied so that the shifting may be achieved.

Therefore, a vehicle equipped with an automatic transmission in which the operating state is controlled according to the hydraulic pressure does not require the operation of a clutch pedal to cut off power from the engine in order to change the operating state of the corresponding shift gear. Fatigue can be reduced, and an engine stall is not generated due to a malfunction of the driver or an immature driving during driving, so that even a beginner can easily operate a driving operation.

As described above, the target shift stage is determined according to the driving state of the vehicle, and when the control operation to the determined target shift stage is executed, the corresponding friction element is operated for each target shift stage among friction elements consisting of a clutch or a brake. Let's do it.

In a vehicle equipped with an automatic transmission operating as described above, a shift occurs at a low speed while a sudden shift occurs during high speed driving, and a vehicle with an automatic transmission is upshifted and downshifted again by a certain shift pattern during rapid brake operation.

However, the above-described conventional technology has a problem in that the braking distance of the vehicle is long, the durability is lowered, and the driving ability of the driver is lowered when the driver is suddenly braked. Determining whether MDCHK5 is set to 1; When the mode check variable MDCHK5 is set to 1, determining whether the fuzzy rule 10 is satisfied; When the purge rule 10 is established in the above manner, the driver determines that the rapid brake is operated during high-speed driving while the shift stage is at the lower stage, and sets the mode check variable MDCHK5 to 1, and a purge for preventing hunting during the uphill driving of the vehicle. Determining whether rule 1 is true; In the above case, when the vehicle establishes the purge fnf 1 for preventing hunting while driving uphill, the braking distance of the vehicle may be shortened when the rapid brake is operated during high speed driving while the shift stage of the control mode 1 for driving hunting is prevented on the uphill driving. And performing a control mode 5 processing subroutine for the control mode.

1 is a block diagram of a shift control apparatus of an automatic transmission according to an embodiment of the present invention;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the accompanying drawings, in which the above-described objects can be achieved and realized in detail. In order to convert the vehicle speed into kilometers (km / h) to the longitudinal deceleration ratio (FGR), it is possible to calculate the actual running vehicle speed V of the vehicle by calculating the calculated value by calculating 1000.

(No is the number of rotation of the output shaft in consideration of the vehicle speed,

to be.)

(No is the output shaft speed of the current transmission,

Fe = (Te-Tei) · η · tr · TGR (i) · FGR / Rr

to be.)

The torque ratio tr of the torque converter can be calculated from the torque map of the torque converter by interpolation in accordance with the speed ratio e. W is the weight of the vehicle (Kgh)

to be.)

RW = 0.5 · ρ · S · CD · V ² (where RW is the vehicle's air resistance value, ^{2 4}

to be.)

Me = W / 9.8 + Iw / Rr ² + Ip · (TGR (i) / Rr) ² (where W is the weight of the vehicle,

Iw is the Inertia of the wheel, Ip is the innerertia of the transmission,

to be.))

to be.)

In addition, the brake deceleration BDQ during driving of the vehicle may be calculated by the speed change amount in the section where the brake switch is 1 as follows.

(V1 is the vehicle speed at the moment when the brake switch is turned on (1) to off (0),

next

Normal control mode: As shown in the mode '0' diagram, it is determined whether or not the purge rule 9 is established in which the vehicle speed V is the maximum B and the throttle change ΔTh is the maximum B (S100).

When the purge rule 9 is established in the above, the control means 20 determines whether a predetermined time has elapsed (S110).

When the purge rule 10 is established in the above, the control means 20 determines that the driver has operated the rapid brake during high-speed driving in the state where the speed change stage is low, and sets the mode check variable MDCHK5 to 1, as shown in Table 3. As described above, it is determined whether the purge rule 1 for preventing hunting during the uphill driving of the vehicle is established (S140 and S150).

In the case where the vehicle establishes the purge rule 1 for preventing hunting while driving uphill, the control means 20 for preventing hunting on the uphill road is controlled when the rapid brake is operated during high speed driving while the shift stage of the driving mode is low. The control mode 5 processing subroutine for shortening the braking distance is performed (S160). When the time set above has passed, the control means 20 sets the control mode 5 which is the deceleration control mode to 0 to cancel the deceleration mode and performs the control mode 0 processing subroutine which is the normal control mode (S134). However, when the shift stage is not the second speed or the third speed, the control means 20 performs a control mode 0 processing subroutine which is a normal control mode (S175).

As described above, the engine torque, the gradient degree, the acceleration, and the like are calculated according to the arithmetic formula set by receiving signals that are varied and output according to the vehicle driving state in the embodiment of the present invention, and the vehicle speed, the gradient suitability, the downhill fitness, the brake deceleration. By creating a value such as the quantity and defining a membership function according to it, constructing a fuzzy rule for this membership function to grasp the situation suitable for the driver's intention and to perform the shift control accordingly, so that the sudden brake during high speed driving at low stage As the braking distance of the vehicle is shortened by prohibiting the upshift during driving, it is possible to provide a shift control method of an automatic transmission having an effect of increasing the durability of the vehicle and improving driving stability.

Claims (13)

When the vehicle starts to drive and the speed change stage is running at high speed during low speed driving, when the mode '9' check subroutine starts, the vehicle speed (V) is maximum (B) and the throttle change amount (ΔTh) is maximum (B). Determining whether or not the fuzzy rule 9 is established; Determining whether a predetermined time has elapsed when the purge rule 9 is established; Determining whether the mode check variable MDCHK5 is set to 1 to determine whether the control stage 5, which is a deceleration control mode by rapid brake operation, is set when the speed change stage is low, when the time set above has elapsed; When the mode check variable MDCHK5 is set to 1, determining whether the fuzzy rule 10 is satisfied; When the purge rule 10 is established in the above manner, the driver determines that the rapid brake is operated during high-speed driving while the shift stage is at the lower stage, and sets the mode check variable MDCHK5 to 1, and a purge for preventing hunting during the uphill driving of the vehicle. Determining whether rule 1 is true; When the vehicle establishes the purge rule 1 for preventing hunting while driving uphill, the braking distance of the vehicle may be shortened when the rapid brake is operated during a high speed while the shift stage of the control mode 1 for driving the hunting mode on the uphill is low. A shift control method for an automatic transmission, characterized by comprising the step of performing a control mode 5 processing subroutine. The shift control method for an automatic transmission according to claim 1, comprising the step of ending all the control that fails to establish the purge rule 9 and returning to the main routine. The automatic transmission according to claim 1, wherein when the purge rule 1 is not established, the automatic transmission includes performing a control mode 5-processing subroutine for shortening the braking distance of the vehicle during rapid brake operation during high-speed driving in a state where the shift stage is low. Shift control method. The method of claim 1, further comprising: when the purge roll 10 is not established, determining whether to control mode 5, which is a deceleration control mode during rapid brake operation during high-speed driving in a state where the speed change stage is at the lower stage in the previous step; Determining whether the set time has elapsed when the control mode 5 that is the deceleration control mode is established; When the time set forth above has elapsed, the control mode of the automatic transmission comprising the step of setting the control mode 5 in the deceleration control mode to 0 to release the deceleration mode and performing the control mode 0 processing subroutine in the normal control mode. . The shift control method of an automatic transmission according to claim 4, comprising performing a control mode 0 processing subroutine which is a normal control mode when the control mode 5, which is a deceleration control mode, is not established. The method according to claim 4, wherein the control mode 5, which is the deceleration control mode, is established, but when the set time has not elapsed, the step of determining that the rapid brake is continuously performed comprises the step of setting the mode check variable MDCHK5 to 1. Shift control method of the automatic transmission made. The automatic transmission of claim 1, wherein the control mode 5 processing subroutine, which is a normal control mode, is performed when the set time has elapsed since the purge rule 9 is established, but the control mode 5 that is the deceleration control mode is not established. Shift control method. The method according to claim 1, wherein the control mode '5' processing subroutine performing method comprises the steps of: determining whether the shift stage of the current traveling vehicle is second speed when the control mode '5' processing subroutine starts; The shift control method of the automatic transmission comprising the prohibition of the upshift shifting from the second speed to the third speed when the speed change stage of the current traveling vehicle at the second speed. The method of claim 8, further comprising: determining whether the speed change stage is the third speed when the speed change stage of the current traveling vehicle is not the second speed; The shift control method of the automatic transmission comprising the prohibition of the upshift shifting from the third speed to the fourth speed when the shift stage is the third speed. 10. The shift control method according to claim 9, comprising performing a control mode 0 processing subroutine which is a normal control mode when the shift stage is not the third speed. The method according to claim 1, wherein the method for performing the control mode 5 processing subroutine during the control mode 1 processing comprises: determining whether the current shift stage is second speed; And shifting the shift stage from the second to the third speed when the shift stage is the second speed. The method of claim 11, further comprising: determining whether the shift stage is the third speed when the shift stage is not the second speed; The shift control method of the automatic transmission comprising the prohibition of the upshift shifting from the third speed to the fourth speed when the shift stage is the third speed. The method according to claim 12, wherein if the shift stage is not the third speed And outputting a shift control signal for downshifting the shift stage from the fourth speed to the third speed by determining that the speed stage is the fourth speed.