JP3323969B2 - Output control device for automatic transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for controlling an output of a vehicle equipped with an automatic transmission with a torque converter during a select operation from a stop range to a travel range.

[0002]

2. Description of the Related Art Conventionally, in a vehicle equipped with an automatic transmission with a torque converter, a driving range is shifted from a stop range (N or P range) while depressing an accelerator pedal.
(D, 1, 2, R range, etc.), or when depressing the accelerator pedal immediately after the select operation and suddenly starting, the engine output is reduced during shifting to reduce select shock and reduce the load on the differential. There is an apparatus in which an output corresponding to the amount of depression of a pedal is corrected to decrease (for example, Japanese Patent Application Laid-Open No. 61-2821).
No. 35, etc.).

As an example of a specific control method in such a decrease correction of the engine output control, for example, an engine load (for example, an opening amount of a first throttle valve linked to an accelerator pedal) at the time of the select operation is set to a predetermined value. When the value is equal to or more than the value, a second throttle valve for traction control (provided in series with the first throttle valve)
The engine output is reduced by controlling the opening of the engine to a predetermined opening degree in the closing direction, and then the ratio (Nt / Ne) of the rotation speed Nt of the output shaft (turbine shaft) of the torque converter to the engine rotation speed Ne is equal to or less than a predetermined value. In some cases, it is determined that the selection operation has been completed when the output has been reduced, and the output reduction correction is terminated.

[0004]

However, in such a conventional engine output reduction control, as shown in FIG. 6, the valve opening degree TVO2 of the second throttle valve is controlled to a constant amount during the control, and the control is performed. When the control is completed, the motor is returned to the full open state at once. Therefore, there is a problem that the connection of the output shaft torque at the end of the control is poor, and there is a problem that the select shock is large. In the figure, TV
O1 indicates the opening degree of the first throttle valve linked to the accelerator pedal, and Ne indicates the engine speed.

[0005] The present invention has been made in view of such a conventional problem.
It is an object of the present invention to provide an output control device for an automatic transmission capable of sufficiently reducing select shock.

[0006]

Therefore, an output control device for an automatic transmission according to the present invention, as shown in FIG. 1, performs a select operation for detecting a select operation from a stop range to a travel range of the automatic transmission. Detecting means, engine rotational speed detecting means, throttle valve opening degree detecting means interposed in an intake passage and detecting the opening degree of a first throttle valve interlocked with an accelerator pedal, A shift end output shaft torque setting means for setting a transmission output shaft torque at the end of a shift based on the first throttle valve opening and a speed ratio of an output rotation speed to an input rotation speed of the torque converter after the end of the shift; From the torque converter
Before the inertia torque of the rotating body up to the transmission output shaft
An inertia torque calculating means for calculating at every constant sampling period from the selection operation to the end of the shift, and an output torque of the transmission at the end of the set shift and the calculated inertia torque and an input torque of the torque converter after the end of the shift. An engine torque setting means for setting an engine torque based on a torque ratio of an output torque; and a first period according to the set engine torque and a detected engine speed during a period from a select operation to a shift end. And a select engine output control means for controlling an opening of a second throttle valve interposed in the intake passage in series with the throttle valve to restrict an increase in engine output.

[0007]

In this configuration, when the output reduction correction control is started by depressing the accelerator pedal after the selection operation from the stop range to the travel range, the first throttle valve opening at the start time and after the shift is completed. The transmission output shaft torque at the end of the shift is set based on the speed ratio of the output rotation speed to the input rotation speed of the torque converter.
In addition, a torque corresponding to the angular acceleration acting on the moment of inertia of the rotating body between the torque converter and the transmission output shaft, a so-called inertia torque, is calculated at a constant sampling cycle until the shift is completed. Then, the engine torque is set based on the set transmission output shaft torque, the calculated inertia torque, and the torque ratio of the output torque to the input torque of the torque converter at the end of the gear shift. The second throttle valve opening is controlled in accordance with the speed to regulate an increase in engine output.

Thus, at the end of the shift, in other words,
The transmission output shaft torque at the end of the engine output control after the select operation is set to a target value, and the engine output can be controlled to match this target value at the end of the output control, so that the torque connection can be smoothed. become able to.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In FIG. 2 showing a system configuration of an embodiment of the present invention, an automatic transmission 2 with a torque converter is connected to an output shaft of an engine 1. The automatic transmission 2 includes:
As shown in FIG. 3, a torque converter 20 having a lock-up clutch 20A, a servo band 21, a reverse clutch 22, a high clutch 23, a forward clutch 24, a forward one-way clutch 25, an overrun clutch 2
6, a transmission provided with each shift element such as a low & reverse brake 27, a low one-way clutch 28, a forward planetary gear 29, and a rear planetary gear 30. In the drawing, 31 is an input shaft connected to the engine 1 side, and 32 is an output shaft connected to a propeller shaft (not shown).

In order to control the operating oil pressure of each of the speed change elements, there are provided solenoid valves 2A to 2E interposed in hydraulic passages led to these and controlling the operating oil pressure by controlling the valve opening duty. (Fig. 2
See). The automatic transmission 2 includes a shift position sensor 3 for detecting each shift position, and an output shaft of the torque converter 20.
A turbine rotational speed sensor 4 for detecting the rotational speed Nt of the (turbine shaft) is provided.
It is input to the control unit 5 for an automatic transmission (AT).

The solenoid valve for controlling the oil pressure to various transmission elements of the automatic transmission 2 is provided with the AT.
A control signal is output from the control unit 5 for each gear, whereby each shift control is executed. Meanwhile, engine 1
A first throttle valve 6 interlocking with an accelerator pedal (not shown) and a second throttle valve 7 for traction control are interposed in the intake passage, and the second throttle valve 7 is connected to a traction control unit 8. In response to a control signal, when the wheels slip more than a predetermined value during acceleration or the like, the aperture is controlled from full open via an actuator 9 such as a stepping motor. An opening sensor 10 for detecting the opening is mounted on the second throttle valve 7. The first throttle valve 6 is also provided with an opening sensor 13 as a throttle valve opening detecting means.

Further, the engine control for the control unit 11 for controlling the fuel injection amount of the engine 1, ignition timing or the like is provided, the engine control for the control unit 11,
A detection signal from an engine speed sensor 12 that detects the engine speed is input to the traction control unit 8 and the AT control unit 5. In addition to the traction control based on the normal wheel slip control, the traction control unit 8 performs a select operation from the stop range of the torque converter 20 to the travel range via the AT control unit 5 and an engine speed sensor. 12 and opening sensor
The throttle control of the second throttle valve 7 according to the present invention is executed by a select control signal based on various calculation results based on each detection signal from 13.

Next, the throttle control of the second throttle valve 7 based on the select control signal from the traction control unit 8 will be described with reference to the flowchart shown in FIG. In step 1, it is determined whether the flag F is set when the automatic transmission 2 is selected from the stop range to the travel range.

If it is determined that the flag F has not been set to 1, the routine proceeds to step 2, where it is determined whether or not a select operation has been performed from the stop range to the travel range.
If it is determined that the select operation has been performed, the process proceeds to step 3 and the flag F is set to 1;
Proceed to. After that, the determination in step 1 becomes YES, skipping steps 2 and 3, and proceeding to step 4. Here, the shift operation sensor is constituted by the shift position sensor 3 and the determination function of the step 2.

On the other hand, if it is determined in step 2 that the operation for selecting the travel range has not been performed, the routine is terminated. In step 4, the speed ratio e of the torque converter 20 at the end of the shift, that is, the engine rotation speed Ne
Between the rotation speed Nt of the output shaft (turbine shaft) of the torque converter 20 (e = Nt / Ne) and the valve opening TVO1 of the first throttle valve 6 detected by the opening sensor 13 immediately after the selection operation. based sets the transmission output shaft torque T _MAX at the shift end from the predetermined map. Here, the speed ratio e at the end of the shift is predetermined as a characteristic of the transmission. Therefore, the function of step 4 corresponds to the output shaft torque setting means at the end of gear shifting.

In step 5, an engine speed sensor
A difference ΔNe between the current value and the previous value of the engine speed Ne detected at 12 is calculated. In step 6, the torque control
The torque loss due to the angular acceleration α acting on the moment of inertia I of the rotating body between the bar and the output shaft 32 of the transmission, that is, the inertia torque T _INS (= I · α) is calculated. Here, the moment of inertia I is a fixed value, and the angular acceleration α
Is obtained by an arithmetic expression of α = ΔNe · 2π / 60 / s. Here, s is the sampling cycle of ΔNe, which is one cycle of this routine.

In step 7, steps 4 and 6
Output shaft torque T _MAX and inertia torque T obtained by
_{Based on the INS} and the torque ratio t of the torque converter 20 at the end of the shift, the engine torque Te at the end of the shift is calculated by the following equation. Te = ( _TMAX + _TINS ) / t Here, the torque ratio t is a ratio (t = Tt / Te ) of the torque Tt of the output shaft (turbine shaft) to the torque Te of the input shaft 31 of the torque converter 20. The torque ratio t at the end of the shift is determined in advance by the characteristics of the torque converter 20. Therefore, the functions of step 6 and step 7 correspond to the inertia torque calculating means and the engine torque setting means.

In step 8, a valve opening TVO2 of the second throttle valve 7 is obtained from a predetermined map based on the engine torque Te calculated in step 7 and the engine rotation speed Ne detected this time. Then, a select control signal corresponding to the opening obtained in step 8 is generated, and the drive of the second throttle valve 7 is controlled by the actuator 9.

In step 10, an engine speed sensor
12, the ratio of the engine rotation speed Ne detected by the turbine rotation speed sensor 4 to the turbine rotation speed Nt detected by the turbine rotation speed sensor 4, that is, the current speed ratio e of the torque converter 20 (= Nt / Ne ).
And a predetermined value K set in advance. Where Nt /
If Ne ≦ K , it is determined that the shift has not yet been completed, and the process proceeds to step 11, where it is determined whether or not a select operation has been performed from the traveling range to the stop range. If not, the select control is continued as it is. I do. When it is determined in step 10 that Nt / Ne> K , that is, when the speed ratio is larger than a predetermined value , it is determined that the shift is completed, and the routine proceeds to step 12, where the valve opening TVO2 of the second throttle valve 7 is set. And the control of the engine output is terminated. Also, when it is determined in step 11 that the selection operation has been performed from the travel range to the stop range, it is determined that the engine output control has been completed, and the process proceeds to step 12, where the valve opening TVO of the second throttle valve 7 is set.
2 is controlled to fully open. Therefore, the functions of steps 8 to 12 constitute the engine output control means for selection.

After proceeding to step 12, proceed to step 13, reset the flag F to 0, and end the routine.
In this way, when the shift operation is performed from the stop range to the travel range and the accelerator pedal is depressed and the vehicle is suddenly started, the transmission output shaft torque at the end of the shift is set in advance, so that the torque value matches the torque value at the end of the shift. As shown by the solid line in FIG. 5, the valve opening TVO2 of the second throttle valve 7 is gradually controlled in the valve opening direction at the end of the shift according to the engine operating state during the shift period. The change in torque is small and the connection of torque is smooth, and select shock can be greatly reduced.

[0021]

As described above, according to the present invention, the transmission output shaft torque at the end of the shift is set in advance when the automatic transmission is suddenly started immediately after the selection operation from the stop range to the travel range. because you have configured to control the engine output by controlling the valve opening degree of the second throttle valve in response to engine operating state during a gear change period to match the set torque value, at shift completion The connection of the torque becomes smooth, and the select shock can be reliably mitigated.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating the configuration of the present invention.

FIG. 2 is a diagram showing a system configuration according to an embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a hydraulic circuit of the automatic transmission according to the embodiment.

FIG. 4 is a flowchart illustrating an engine output control operation of the embodiment.

FIG. 5 is a time chart showing an operation state of the embodiment.

FIG. 6 is a time chart showing a conventional operation state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine 2 Automatic transmission 3 Shift position sensor 4 Turbine rotation speed sensor 5 AT control unit 6 First throttle valve 7 Second throttle valve 8 Traction control unit 9 Actuator 12 Engine rotation speed sensor 13 Opening sensor

Continuation of the front page (51) Int.Cl. ⁷ identification code FI F02D 9/02 361 F02D 9/02 361H 45/00 330 45/00 330 358 358H 364 364C F16H 61/04 F16H 61/04

Claims (1)

(57) [Claims] An apparatus for controlling an engine output of a vehicle equipped with an automatic transmission with a torque converter, a select operation detecting means for detecting a select operation of the automatic transmission from a stop range to a travel range, and an engine rotational speed detection. Means, a throttle valve opening detecting means interposed in an intake passage and detecting an opening of a first throttle valve interlocked with an accelerator pedal, and the first valve detected immediately after the selecting operation.
A throttle valve opening and the transmission end time output shaft torque setting means for setting a transmission output shaft torque at the shift end based on the velocity ratio of the output rotational speed to the input speed of the torque converter after the shift end of the torque Speed change from converter
The inertia torque of the rotating body up to the machine output shaft is
An inertia torque calculating means for calculating at every fixed sampling period from the operation of the rect operation to the end of the shift; an output torque of the transmission at the end of the set shift and the calculated inertia torque and an output corresponding to the input torque of the torque converter after the end of the shift. An engine torque setting means for setting an engine torque based on a torque ratio of the torque; and a first engine torque setting means for setting the engine torque in accordance with the set engine torque and a detected engine speed during a period from a select operation to a shift end. A select engine output control means for controlling an opening degree of a second throttle valve interposed in the intake passage in series with the throttle valve to regulate an increase in engine output. Machine output control device.