JPH06173727A - Automatic transmission and control device for engine - Google Patents

Abstract

PURPOSE:To set a gear change time to be constant at all times by making it to approach a reference value. CONSTITUTION:A gear change starting time DT1 and a gear change complete time DT2 are inputted from an automatic transmission control unit 16 into an engine control unit 14. In the engine control unit 14, a gear position is read-in on the basis of those values, and a map is selected, and then an ignition timing delay amount thetaij is read-in on the basis of an engine rotating speed NE and a fuel supplying amount TP. An engine 10 is controlled on the basis of an ignition timing lead angle theta0 which is found out by subtracting the ignition timing delay amount thetaij from a reference lead angle thetaNE. After gear change is completed, the value of the ignition timing delay amount thetaij is changed on the basis of a maximum time T1 which can be covered by a gear change transient time t', a reference time t0 and the ignition timing delay amount thetaij, and then the value of the ignition timing delay amount thetaij is written in the map.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an automatic transmission and an engine.

[0002]

2. Description of the Related Art As a conventional automatic transmission control device, there is one disclosed in Japanese Patent Laid-Open No. 61-88059. The automatic transmission control device shown in the figure compares the amount of gear change process such as gear change time, friction member slip time, and rate of change of input speed with respect to time with a preset reference amount, and both are compared. The hydraulic pressure applied to the friction member of the automatic transmission is controlled so as to coincide with each other. Thereby, for example, the shift time is always kept constant and the shift performance is kept constant.

[0003]

However, in the above-described conventional control device for an automatic transmission, there is a problem that it is difficult to control the shift time to be constant as desired due to the large variation in hydraulic pressure. Incidentally, JP-A-56-399
Japanese Patent Laid-Open No. 25-25 discloses that the engine torque is reduced by a signal output from the automatic transmission during gear shifting. However, in this case, there is a problem that the reduction amount of the engine torque is not controlled and the gear shifting performance cannot always be maintained in a good state. The present invention is intended to solve such a problem.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above problems by making the amount of decrease in engine torque variable and bringing the actual shift time closer to a reference value. That is, the automatic transmission and the control device for the engine of the present invention have a shift time detecting means for detecting the time from the start to the end of the shift of the automatic transmission, and an engine torque reducing means for reducing the engine torque. It is characterized in that an engine torque command means during shifting is provided for operating the engine torque lowering means so as to bring the shifting time closer to a preset reference value during shifting. Also,
An automatic transmission and an engine control device according to the present invention include a shift time detection unit that detects a time from the start to the end of a shift of an automatic transmission, and a hydraulic pressure that can control a hydraulic pressure applied to a friction engagement device of the automatic transmission. An operating condition identifying unit for identifying an operating condition capable of reducing the engine torque and an operating condition not capable of reducing the engine torque, and an engine torque reducing unit for reducing the engine torque. Under operating conditions that enable the engine torque commanding means to operate the engine torque reducing means so as to bring the shift time closer to a preset reference value during gear shifting, and in operating conditions where engine torque cannot be reduced Hydraulic command during gear shifting to operate the hydraulic pressure adjusting means of the automatic transmission so that the gear shifting time approaches the preset reference value And having a stage, a.

[0005]

The actual shift time can be brought closer to the reference value by lowering the engine torque during shifting by a predetermined amount. Further, since only the engine torque is reduced and the hydraulic pressure of the automatic transmission is not changed, the output shaft torque does not change. As a result, the shift shock does not increase. Further, in the case of the invention of claim 2, under the operating condition where the torque reduction of the engine is impossible, the shift time is made constant by adjusting the hydraulic pressure of the automatic transmission as in the conventional case, so that the entire operating range of the engine is The shift time can be kept constant over the entire period.

[0006]

EXAMPLE FIG. 2 shows an example of the present invention. Engine 10
The two are connected so that the torque is input to the automatic transmission 12. The operation of the engine 10 is controlled by the engine control unit 14. The automatic transmission 12 is an automatic transmission control unit (ATCU).
Operation is controlled by 16. The signal from the automatic transmission control unit 16 is sent to the engine control unit 14. The engine 10 can reduce the torque more than usual by the device 18 (engine torque reducing means) that changes the advance angle of the ignition timing.

In the engine control unit 14,
The control shown in FIGS. 3 and 4 is performed. First, it is determined whether or not a shift command is output from the automatic transmission control unit 16 (step 102). If it is not output, the process returns to step 102. If it is output, the engine speed NE, the automatic transmission 12 output shaft rotation speed NP and fuel supply amount TP (fuel injection pulse width)
Turn on the monitor (No. 104). Then, the signal DT input from the automatic transmission control unit 16
Based on 1, it is determined whether or not the shift has started (step 106). The automatic transmission control unit 16
Then, as shown in FIG. 5, it is determined that the gear shift is started by the start of reduction of the engine rotation speed (time t1),
The signal DT1 is output. If gear shifting has started,
The timer is turned on and the count n is set to 0 (108). Next, the gear ratio when the signal DT1 is output,
A gear ratio at the time of output of a signal DT2 (which is output at the end of gear shift) described later is read (at step 110). Then, a map is selected according to the read gear ratio (see 11
2). In the map, the ignition timing delay amount θij is set as a function of NE and TP. Next, the current actual NE and TP are read (step 114). Next, the ignition timing delay amount θij is read from the selected map based on the read NE and TP (step 116). Next, the ignition timing advance amount θ0 is obtained by subtracting the ignition timing delay amount θij from the basic advance angle θNE (step 118). Then θ
0 is output (at 120). Next, it is determined whether or not the shift is completed based on the signal DT2 input from the automatic transmission control unit 16 (step 122). In addition,
The signal DT2 is output when the ratio (gear ratio) between the engine rotation speed NE and the output shaft rotation speed NP changes to a predetermined value. If the shift has not ended, step 112
If it is finished, the timer is turned off (124). Next, shift time t '(= t2-t1)
And the reference time t0 are not equal (see 1
26), if they are equal, the map is not changed (128), and if not equal, the absolute value of the value obtained by subtracting t0 from t ′ is the ignition timing delay amount θ selected in step 116.
It is determined whether it is smaller than the maximum time T1 that can be covered by ij (at 130). When the absolute value of t'-t0 is smaller than T1, t'and t0 are compared (see 13 above).
2). When t ′ is larger than t0, Δθ is added to θij to increase the torque reduction amount (134), and when t ′ is smaller than t0, Δθ is subtracted from θij to reduce the torque reduction amount. (Id. 136). In step 130, when the absolute value of t'-t0 is larger than T1, t'is compared with t0 (step 138). t'is t0
If it is larger than θij, Δθ is added to increase the amount of torque decrease, and the clutch pressure is reduced by the hydraulic pressure adjusting means (at 140), and if t ′ is smaller than t0, Δθ is subtracted from θij. The torque decrease amount is reduced and the clutch pressure is increased by the hydraulic pressure adjusting means (at step 142). Next, the newly set θij is written in the map (at 144). If the gear shift start is not instructed in step 106, it is determined whether or not the rapid deceleration is being performed (step 146). finish. Steps 106 and 122 constitute shift time detecting means, and steps 126, 130, 132, 1
34, 136, 138, 140, 142 and 144,
It constitutes an engine torque command means during shifting.

FIG. 5 shows a shift transient characteristic diagram. The shift command signal changes from 1 to 0 when a shift command is issued, and changes from 0 to 1 when the shift is completed. When shifting starts, NE, NP
And the TP monitor is turned on. The timer is turned on at t1 and turned off at t2, which is a short time after the shift is instructed. NE decreases from t1 to t2. The hydraulic pressure rises stepwise after the gear shift is commanded. The engine torque decreases from t1 to t2. When the time from t1 to t2 is longer than the preset reference value of the shift time, the next engine torque decrease amount is increased, and when it is short, the next engine torque decrease amount is decreased.

[0009]

According to the present invention, the actual shift time can be brought close to the reference value by reducing the engine torque during shifting by a predetermined amount. Further, since only the engine torque is reduced and the hydraulic pressure of the automatic transmission is not changed, the output shaft torque does not change. As a result, the shift shock does not increase.

[Brief description of drawings]

FIG. 1 is a diagram showing relationships between components of the present invention.

FIG. 2 is a diagram showing an example of the present invention.

FIG. 3 is a control flow of the embodiment.

4 is a continuation of the control flow of FIG.

FIG. 5 is a shift transient characteristic diagram.

[Explanation of symbols]

 10 engine 12 automatic transmission

Claims (2)

[Claims] 1. An automatic transmission and an engine control device comprising: a shift time detecting means for detecting a time from the start to the end of a shift of the automatic transmission; and an engine torque lowering means for lowering an engine torque. An automatic transmission and an engine control device, characterized in that an engine torque commanding means during gear shifting is provided for operating the engine torque lowering means so as to bring the gear shifting time closer to a preset reference value during gear shifting. 2. A shift time detecting means for detecting a time from the start to the end of shifting of the automatic transmission, a hydraulic adjusting means for controlling a hydraulic pressure applied to a friction engagement device of the automatic transmission, and an engine torque. In an automatic transmission and an engine control device having an engine torque reducing means for reducing the engine torque, an operating condition identifying means for identifying an operating condition in which the engine torque can be reduced and an operating condition in which the engine torque cannot be reduced, and an engine torque reduction Under the possible driving conditions, the engine torque command means during the shifting for activating the engine torque lowering means so as to bring the shift time closer to the preset reference value at the time of shifting, and the shifting of the engine torque under the driving conditions in which the engine torque cannot be lowered. At the time of shifting, the hydraulic pressure command during shifting is operated to operate the hydraulic pressure adjusting means of the automatic transmission so that the shifting time approaches the preset reference value. If the automatic transmission and the engine control device, characterized in that it comprises a.