JPS6343836A - Integral controller for automatic transmission and engine - Google Patents

Abstract

PURPOSE:To prevent any inconvenience to be produced by frequent control from occurring, by delaying execution of the next gear shifting attended with an alteration of engine torque till the elapsed time since the gear shifting attended with the engine torque alteration has been done comes to the specified time. CONSTITUTION:A device (a) automatically selects shift speeds of an automatic transmission (b) according to a preset shift map, while it alters torque of an engine (c) as much as the specified value during gear shifting and thereby a shift characteristic is favorably maintained. In the above-mentioned controller, the elapsed time since the gear shifting attended with an alteration of torque in the engine (c) has been done is detected by a device (d). And, till the detected elapsed time comes to the specified time, as to at least the gear shift attended with the torque alteration of the engine (c), its execution is made so as to be delayed by a device (e). With this constitution, any inconvenience to be produced by what torque control over the engine (c) is frequently performed is directly prevented, whereby a restriction in a design or the like of control toutine is made unnecessary.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an integrated control device for an automatic transmission and an engine, and in particular, by changing the gear stage to automatic mode according to a preset shift map, and changing the engine torque by a predetermined amount at the time of shifting. The present invention relates to an improvement in an integrated automatic transmission and engine control device that maintains good transmission characteristics.

[Conventional technology]

It is equipped with a gear transmission mechanism and a plurality of frictional engagement devices, and by operating a hydraulic control device, the engagement of the frictional engagement devices is selectively switched, and the engagement of the frictional engagement devices is selectively changed to one of the plurality of gears according to a preset shift map. Automatic transmissions for vehicles configured to achieve any of the following are already widely known. In addition, in such automatic transmissions for vehicles, the engine torque is changed during gear shifting to obtain good shifting characteristics, and the automatic transmission and engine are integrated to ensure and improve the durability of the frictional engagement device. Various control devices have also been proposed (
For example, JP-A-55-69738). In other words, such integrated control of the automatic transmission and engine changes the amount of torque transmitted from the engine during gear shifting, and controls the amount of energy absorbed by each member of the automatic transmission or the friction engagement device that brakes them. Thus, the gear shift is completed in a short time and with a small shift shock, giving the driver a good shift feeling, and improving the durability of the friction engagement device.

[Problems to be solved by the invention]

However, if, for example, a method of delaying ignition timing is adopted as a means of changing (reducing) engine torque,
This delay in ignition timing increases so-called afterburning, in which the exhaust valve opens before the mixed gas is completely combusted in the engine cylinder, and the high-temperature gases being combusted are discharged to the exhaust pipe, increasing the temperature of the exhaust system ( A problem arises in that the exhaust gas temperature, catalyst temperature, exhaust pipe temperature, etc.) rises. or,
Depending on the type of gear shifting, the engine torque may be controlled to increase, but in this case, the method of changing (increasing) the engine torque is, for example, increasing the amount of fuel supply or intake air. In this case, the temperature of the exhaust system generally reaches an upper limit. In this way, the temperature rise in the exhaust system caused by changing the engine torque during gear shifting is not a problem if the gear shifting frequency is high during normal driving. If the accelerator is turned on and off during operation, the temperature of the exhaust system will rise above the allowable value, and in severe cases, it will adversely affect the durability of the exhaust manifold.In addition, in turbocharged engines, the exhaust side turbine This may adversely affect the durability of the blades. Also, if the engine torque is reduced by reducing the amount of fuel supply or intake air, if this is done frequently, it may cause engine misfires, deterioration of exhaust gas components, etc. Therefore, in the past, when designing routines related to engine torque control and setting maps for engine torque changes, even if gear shifts were performed at the highest expected frequency, It was necessary to take care to avoid the above-mentioned inconveniences. However, from this point of view, for example, if the amount of retardation of the ignition timing is set to a small value, the amount of decrease in engine torque will naturally be reduced. This causes a problem in that the original control objective of improving the speed change characteristics including the durability of the frictional engagement device cannot be sufficiently achieved.

[Purpose of the invention] The present invention has been made in view of such conventional problems, and is intended to directly deal with the problem only when there is a possibility that a problem may actually occur in engine torque control during gear shifting. It is an object of the present invention to provide an integrated control device for an automatic transmission and an engine, which increases the degree of freedom in setting and allows the original function of engine torque control to be fully exerted in normal conditions. [Means to solve the problem]

The present invention is an automatic transmission that is capable of automatically changing gears according to a preset shift map, and maintains good gear shifting characteristics by changing engine torque by a predetermined amount during gear shifting. and an integrated engine control device, as shown in FIG. The above object has been achieved by providing means for delaying the execution of at least the gear change accompanied by the engine torque change. Detects how much time has actually passed since a controlled gear shift was performed,
Since the execution of at least the next gear change accompanied by a change in engine torque is delayed until this elapsed time reaches a predetermined time, it is possible to directly prevent inconveniences caused by frequent engine torque control. There is no need to set restrictions to avoid these inconveniences when designing engine torque control routines or settings between torque changes, etc., and there is a higher degree of freedom, which means engine torque control that is more in line with the original purpose. be able to do it. Note that, in order to simplify control, the present invention provides that, until a predetermined time elapses after a gear shift involving engine torque is performed, regardless of whether or not the next shift involves a change in engine torque, First, the execution of the -off shift may be delayed. Furthermore, the present invention does not limit the means for delaying execution of the next gear change. For example, when deciding on a gear shift,
It is also possible to wait for the execution (shift command) for a predetermined time while performing the same as usual, or to not make the shift determination itself at 9 when the predetermined time has elapsed, and to make the shift determination as the predetermined time elapses. The process may be executed immediately based on the judgment. (Embodiments) Embodiments of the present invention will be described in detail below with reference to the drawings. Fig. 2 is an overall schematic diagram of an integrated control device for an automatic transmission and an engine to which the present invention is adopted. Engine 1 and automatic transmission 2 are well known.The engine 1 has an engine control computer 7 that controls the fuel injection amount at the injection valve 19 and the ignition timing at the distributor 20, and adjusts the accelerator opening and the engine rotation speed. The corresponding engine output is obtained.Also, in the automatic transmission 2, the solenoid valves 81 to S3 are controlled by the automatic transmission control computer 8, and the oil path of the hydraulic control device 3 is changed. The engagement state of each frictional engagement device is selectively changed, so that a gear position corresponding to the vehicle speed and the accelerator opening can be obtained. Engine rotational speed, intake air contention determined by the intake amount sensor 10, intake air temperature determined by the intake air temperature sensor 11, throttle opening determined by the throttle sensor 12, vehicle speed determined by the vehicle speed sensor 13, engine water temperature determined by the engine water temperature sensor 14, and brake determined by the brake switch 15. Each ON signal is input.The engine control computer 7 determines the fuel injection amount and ignition timing based on these signals.The engine control rule computer 7 also includes an automatic transmission control computer. 0N-OFF by 8
Each solenoid signal of the electromagnetic solenoid valves 81 to S3 to be controlled is inputted, and based on this, the timing of shifting of the automatic transmission is determined. On the other hand, the automatic transmission control computer 8 receives signals from the throttle sensor 12, vehicle speed sensor 13, engine water temperature sensor 14, brake switch 15, etc., as well as a shift lever signal from a shift position sensor 16.
position, a driving selection pattern such as fuel economy-oriented driving or power performance-oriented driving by the pattern select switch 17, and signals such as permission to shift to overdrive by the overdrive switch 18 are input, and the gear position corresponding to the vehicle speed and accelerator opening is input. The solenoid valves 81 to S3
is controlled ON-OFF. FIG. 3 is a flowchart of integrated control of the engine and automatic transmission. In the control routine of the engine control computer, it is determined from the signal changes of the solenoid valves S1 to S3 that a gear shift will occur (step 122), and then the engine rotation speed changes (for example, if it is an upshift, the engine rotation speed decreases). At this point, it is determined that the gear shift has actually started (step 124), and a retardation (engine torque reduction) is started according to a predetermined retard amount depending on the type of shift, throttle opening, etc. (step 1).
26). The end of the shift is determined when the shift progresses and the engine speed changes to a speed equal to the engine speed at the end of the shift determined by the output shaft rotation speed and gear ratio plus a predetermined value (including negative numbers). Judgment Step 12
8) After that, the retardation is finished relatively slowly over a predetermined period of time, and in step 130), the normal ignition timing is restored. FIG. 4 is a flowchart that is executed in the automatic transmission control routine after such a shift accompanied by a change in engine torque is performed. First, in step 202, the value of flag F is determined. This flag F is a flag for checking whether a predetermined time has elapsed. Since it is initially set to zero, the process advances to step 204. In step 204, it is determined whether the gear shift in which the torque was reduced has been completed. When it is determined that the gear shift in which the torque is reduced has been completed, the process proceeds to step 206, where the timer Ti is reset to zero and starts counting. Step 208
In , it is determined whether or not the next gear shift will occur. If there is no next shift determination, the flag F is set to 1 in step 211, and the flow is substantially put on standby until the next shift occurs via steps 202 and 203. When it is determined that the next shift will occur, the process proceeds to step 210, where it is determined whether or not the timer Ti started in step 206 has exceeded a predetermined time To. When the timer Ti is less than the predetermined time To, step 21
2, flag F is set to 2, and step 202.
The determination in step 210 is repeated via step 203. At the stage when the gear change judgment is made in step 208,
When the timer Ti has already exceeded the predetermined time To,
This step 210 is skipped. When the timer Ti exceeds the predetermined time To, the process proceeds to step 214 and a gear shift is executed. That is, the gear change command is issued. Thereafter, in step 216, the 7 lag F is set to zero and then reset. As a result of this control flow, even if the next gear change decision is made, its execution will be delayed until the predetermined time To has elapsed after the gear shift with torque reduction is completed, and the execution will be delayed even if the next gear change decision is made. Therefore, it is possible to prevent consecutive gear changes from being carried out within an extremely short period of time. Note that in the above embodiment, the execution of the next shift is delayed until a predetermined time has elapsed regardless of whether or not the next shift involves a change in engine torque. In the case of a shift that does not involve , the execution of the shift may not be delayed. For example, when the throttle opening is below a predetermined value, the engine torque is generally not controlled to change. Shifting that does not involve a change in engine torque does not cause problems such as an increase in exhaust temperature, so there is no particular problem if such a shift is performed immediately. In order to delay the execution of the gear shift only when the next gear shift is a gear shift accompanied by a change in engine torque, it is determined in step 208 whether or not the next gear shift will occur, and the It is also possible to determine whether or not the shift involves a change in engine torque, and to immediately execute the shift if the shift does not involve a change in engine torque. In addition, in the control flow of the above embodiment, the judgment as to whether or not the next gear shift will occur is made as usual, and the elapse of a predetermined time is checked for execution. The gear change judgment itself is not made until a predetermined time has elapsed after the gear shift in which the gear was down has been completed.
The gear shift determination may be made after a predetermined period of time has elapsed, and if a gear shift occurs, it may be executed immediately. By doing so, it becomes possible to directly shift to the optimum gear position after a predetermined period of time has elapsed. In this case, the next shift will necessarily be delayed for a predetermined period of time regardless of whether or not the next shift involves a torque change. Generally speaking, humidity in the exhaust system increases when the torque is changed, such as when the engine torque is decreased by delaying the ignition timing, or when the engine torque is increased by increasing the fuel injection M. . If a method is used to reduce engine torque by reducing the fuel injection amount or intake air amount during gear shifting, the present invention can prevent misfires or deterioration of exhaust gas components due to continuous reduction in fuel injection amount, etc. It will be possible to prevent this.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the gist of the present invention, and FIG. 2 is a block diagram showing the gist of the present invention.
FIG. 3 is an overall block diagram showing the configuration of an integrated automatic transmission and engine control device in which an embodiment of the present invention is adopted.
FIG. 4 is a flowchart showing the retard control routine employed in the above-described embodiment. FIG. 4 is also a flowchart showing the automatic transmission control routine. 1... Engine, 2... Automatic transmission, 7... Engine control computer, 8...
Automatic transmission control computer, To...predetermined time.

Claims (1)

[Claims] (1) An automatic system that is capable of automatically changing gears according to a preset gearshift map, and maintains good gearshift characteristics by changing engine torque by a predetermined amount during gearshifting. In an integrated control device for a transmission and an engine, means for detecting an elapsed time since a shift involving a change in the engine torque is performed; An integrated control device for an automatic transmission and an engine, characterized by comprising: means for delaying execution of the next gear shift.