JP2714054B2 - Control device for vehicle engine with automatic transmission - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a control device for an engine for a vehicle with an automatic transmission, and in particular, reduces engine output during a shift operation of a transmission to reduce shift shock. The present invention relates to an improvement in a control device for an engine for a vehicle with an automatic transmission, which is designed to be integrated.

<< Related Art >> Generally, in a vehicle in which an automatic transmission is attached to an engine that generates a large torque, a shift shock of the vehicle generated during the shift operation and an impact force applied to a transmission mechanism of the automatic transmission are reduced. Therefore, the shift clutch of the automatic transmission is slid for a long time. However, if the clutch is slid for such a long time, the wear of the clutch is promoted, and the reliability of the automatic transmission is lowered, for example, the durability is reduced.

Therefore, the shift operation of the automatic transmission is detected, and during this shift operation, the engine output is reduced by a predetermined amount, for example, by retarding the ignition timing, thereby reducing the shift shock, and It has been conventionally considered to reduce the slip time of the clutch. (Problems to be Solved by the Invention) In recent years, automatic transmissions have been shifting their shift schedules between an economy mode that emphasizes fuel economy performance and a power mode that emphasizes power performance. Although there is a type that can be arbitrarily switched, in a vehicle equipped with such an automatic transmission, if the engine output is reduced by a predetermined amount as described above during the shift operation, the vehicle runs in the power mode. In such a case, there is a problem that a feeling of weakness is felt in the power performance during the shift operation, and unsatisfactory points remain in the drive feeling.

The present invention has been made in view of such circumstances, and an object of the present invention is to control a vehicle engine with an automatic transmission that can minimize a decrease in power performance when a power mode is selected. It is to provide a device.

<< Means for Solving the Problems >> In order to achieve the above object, the present invention provides an automatic mode that can arbitrarily select a power mode shift schedule that emphasizes power performance and an economy mode shift schedule that emphasizes fuel economy performance. A transmission, a shift operation detecting means for detecting a shift operation of the automatic transmission, and an engine output reducing means for receiving an output from the shift operation detecting means and reducing an engine output during a shift operation of the automatic transmission A mode determining means for determining whether a selected shift schedule of the automatic transmission is an economy mode or a power mode, and the engine output The lowering means include
Economy mode output reduction amount setting means for setting the engine output reduction amount to a first predetermined amount so as to reduce shift shock; and reducing the engine output reduction amount to a second predetermined amount smaller than the first predetermined amount. Power mode output reduction amount setting means for setting, wherein the engine output reduction means receives the output from the mode determination means and sets the economy mode output reduction amount when the economy mode is selected. Means, and when the power mode is selected, the power mode output reduction amount setting means is selected, and based on each set engine output reduction amount, the engine during the shift operation of the automatic transmission is operated. The output is reduced.

<< Operation >> According to the present invention having the above configuration, when the power mode is selected for the shift schedule of the automatic transmission, the amount of decrease in engine output reduced by the output reduction means during the shift operation of the automatic transmission is: Since the power mode can be reduced to a lesser extent than when the economy mode is selected, the drop in power performance during the shifting operation in that power mode is as small as possible, and the power performance during shifting operation is less powerful. The drive feeling is improved as little as possible.

<< Embodiment >> Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic block diagram of a control device for a vehicle engine with an automatic transmission according to the present invention. In FIG. 1, reference numeral 10 denotes an in-line four-cylinder engine, and reference numeral 12 denotes a four-wheeled engine connected to the rear side of the engine 10. The automatic transmission 12 is connected to a rear differential gear 16 via a propeller shaft 14. Reference numeral 18 denotes a rear tire.

The engine 10 is provided with an igniter 20 for generating a high voltage in the secondary coil, and a distributor 22 for distributing the output voltage to the ignition plug of each cylinder.
The igniter 20 is controlled by an engine control unit 24. Where 26
Is a crank angle sensor that detects the crank angle, 28 is a throttle sensor that detects the opening of the throttle valve, 30 is a water temperature sensor that detects the cooling water temperature, and 32 is an air flow meter that detects the amount of intake air. Various sensors 26
The engine control unit 24 is connected to the engine control unit 24, and the engine control unit 24 controls the igniter 20 so that the ignition plug is sparked at an ignition timing at which the operation state of the engine 10 becomes the best in response to a signal from these units.
Control.

On the other hand, the automatic transmission 12 is provided with speed change mechanisms (solenoid switches, etc.) 34a to 34c for shifting to each speed step, and a lock-up mechanism (solenoid switch, etc.) 36 for locking up a specific speed step. ing. And
The transmission mechanisms 34a to 34c and the lock-up mechanism 36 are controlled by an automatic transmission control unit 38.

Here, 40 is a vehicle speed sensor that detects the vehicle speed, 42 is a lever position sensor that detects the position of the shift lever, and 44 is a selector that selects whether the shift schedule of the automatic transmission 12 is set to the economy mode or the power mode. These various sensors 40 to 44 are connected to the automatic transmission control unit 38 together with the throttle sensor 28 and the water temperature sensor 30. In addition, the automatic transmission control unit 38 has a shift schedule in economy mode in which the shift-up point is set closer to the low-speed side so that the shift-up point is shifted toward the high-speed side as soon as possible with an emphasis on fuel efficiency performance, and A shift schedule of the power mode in which the upshift point is set closer to the high-speed side so that the vehicle is pulled for a long time in a low gear position with emphasis on performance is stored in advance, and an output signal from the mode selection switch 44 is stored. Accordingly, the automatic transmission 12 is controlled to perform a shift operation in accordance with the shift schedule in the economy mode or the shift schedule in the power mode.

By the way, the engine output reduction means 46 according to the present invention is composed of the above-described engine control unit 24 and an ignition system such as the igniter 20 controlled by the engine control unit 24 in this embodiment. The engine output is reduced by a predetermined amount by performing the predetermined value retard control over the timing.

The shift operation detecting means 48 is constituted by the automatic transmission control unit 38, and the mode determining means 50 is constituted by the mode selection switch 44. Signals are transmitted and received between the automatic transmission control unit 38 and the engine control unit 24. When the automatic transmission 12 is shifted, a signal indicating the shift operation is sent from the automatic transmission control unit 38 to the engine. In addition to being output to the control unit 24, a signal of the shift schedule selection mode determined by the mode determination means 50 is also output.

When a signal indicating a shift operation is input from the automatic transmission control unit 38, the engine control unit 24 delays the output of the ignition signal to the igniter 20 by a predetermined value from the ignition timing at which the normal maximum output is obtained. The engine output is reduced by a predetermined amount. At this time, the ignition timing retard value
thtsft corresponds to the two shift schedules of the automatic transmission 12, and the economy mode shift retard value thtsft (E) and the power mode shift retard value thtsft (P) are previously stored on a table in the engine control unit 24. Based on the selection signal of the selected mode from the mode determination means 50, a desired value based on the engine speed from the economy mode shift retard value thtsft (E) or the power mode shift retard value thtsft (P) is stored. The retard value thtsft is calculated. Also, economy mode shift retard value thts
Power mode shift retard value thtsft compared to ft (E)
(P) is set to a small value, whereby the amount of decrease in engine output during the shifting operation when the power mode is selected is suppressed to be smaller than when the economy mode is selected.

That is, the engine output reduction means 46 constituted by the engine control unit 24 includes economy mode output reduction amount setting means for setting the engine output reduction amount to a first predetermined amount so as to reduce shift shock, Power mode output reduction amount setting means for setting the reduction amount to a second predetermined amount smaller than the first reduction amount. Then, the engine output reduction means 46 receives the output from the mode determination means 50, selects the output from the economy mode output reduction amount setting means when the economy mode is selected, and selects the power mode. In this case, the power mode output reduction amount setting means is selected, and the engine output during the shifting operation of the automatic transmission 12 is reduced based on each set engine output reduction amount.

Next, the control flow of this embodiment will be described with reference to the flowchart of FIG. 2. First, in step S10, signals from various sensors such as the engine speed Ne, the intake air amount V, and the water temperature T are read. In step S20, the engine speed N
A basic fuel injection pulse Tp is calculated from e and the intake air amount V.

In the next step S30, based on the engine speed Ne and the basic injection pulse Tp, the basic advance value thtb
se is calculated, and a water temperature advance value thtthw corresponding to the water temperature T is calculated in the next step S40.

Next, in step S50, it is determined whether or not the execution condition of the shift retard is satisfied.

The execution conditions are as follows: the shift delay start flag is set, the engine speed Ne is within the shift retard execution speed range, the shift lever position is in the travel range, the water temperature sensor, the intake temperature sensor, and the throttle sensor. -When the four conditions that there is no abnormality in each output value of the air flow meter are satisfied. The shift delay start flag is set during a shift operation, but the condition for setting this flag is slightly different between upshifting and downshifting. That is, when the upshift is performed, the throttle opening is equal to or more than the set value, the predicted engine speed after the upshift is equal to or more than the set value, and the brake pedal is not further depressed. on the other hand,
At the time of downshift, the throttle opening is not less than the set value, the predicted engine speed after downshift is not more than the set value, and the shift lever is not in the neutral position.

If the determination in step S50 is YES, it is determined in step S60 whether the shift schedule selected in step S60 is the power mode.
If the determination in step is YES and the power mode is selected, the process proceeds to step S70 to calculate the power mode shift retard value thtsft (P) as the shift retard value thtsft.
After shifting to S100, the final ignition timing thtfin (= thtbse + thtt
hw-thtsft), and an ignition signal is transmitted to the igniter 20 according to the final ignition timing thtfin.

On the other hand, if the determination in step S60 is NO and the economy mode is selected, the process proceeds to step S80, and the economy mode shift retard value thtsft is set as the shift retard value thtsft.
(E) is calculated, and then the final ignition timing thtfin is calculated in step S100, and an ignition signal is transmitted to the igniter 20 according to the final ignition timing thtfin.

On the other hand, if the determination in the step S50 is NO and the execution condition of the shift retard is not satisfied, the shift retard value thtsft is set to 0 in a step S90, and then the process proceeds to the step S100, where the final ignition timing thtfin (= thtbse + thtthw-thtsft) is calculated, and the igniter is calculated according to the final ignition timing thtfin.
An ignition signal is transmitted to 20.

That is, as is clear from the above description, in the present embodiment, the power mode in which the power performance is emphasized is selected for the shift schedule of the automatic transmission 12, and the economy mode in which the fuel efficiency performance is emphasized is selected. And if
By changing the retard value of the ignition timing and reducing the retard value in the power mode, the amount of decrease in the engine output during the shift operation of the automatic transmission 12 is varied, and the amount of decrease in the power mode is reduced. I have.

For this reason, the amount of decrease in power performance during the shift operation in the power mode becomes as small as possible, so that the power feeling during the shift operation is not felt as much as possible, and the drive feeling is reduced. Will be improved.

In this embodiment, the engine output reduction means 46 is configured by an ignition system, and the amount of reduction of the engine output is controlled by the ignition timing. The amount of decrease in output may be controlled by the air-fuel ratio, or may be controlled by both the ignition system and the fuel supply system.

<< Effects >> In summary, according to the present invention, when the power mode is selected in the shift schedule of the automatic transmission, the amount of reduction in engine output reduced by the output reduction means during the shift operation of the automatic transmission is reduced by the economy. Since the power performance is reduced as compared to when the mode is selected, the amount of decrease in power performance during the shift operation in that power mode is as small as possible, and the power performance during the shift operation can be less powerful. I can not feel it as much as possible and can improve the drive feeling.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of a control device for a vehicle engine with an automatic transmission according to the present invention, and FIG. 2 is a diagram showing a flowchart of the control device shown in FIG. 10 ... Engine 12 ... Automatic transmission 20 ... Igniter 24 ... Engine control unit 38 ... Automatic transmission control unit 44 ... Mode selection switch 46 ... Engine output reduction means 48 ... Shift operation detection means 50 … Mode determination means

Claims (1)

(57) [Claims] An automatic transmission capable of arbitrarily selecting a shift schedule in a power mode emphasizing power performance and a shift schedule in an economy mode emphasizing fuel efficiency, and a shift operation detecting a shift operation of the automatic transmission. A control device for a vehicle engine with an automatic transmission, comprising: a detection unit; and an engine output reduction unit that receives an output from the shift operation detection unit and reduces engine output during a shift operation of the automatic transmission. A mode determining means for determining whether the selected shift schedule of the automatic transmission is the economy mode or the power mode, and the engine output lowering means includes an engine output lowering means for reducing a shift shock. An economy mode output reduction amount setting means for setting the amount to a first predetermined amount; Power mode output reduction amount setting means for setting a second predetermined amount smaller than the predetermined amount. The engine output reduction means receives an output from the mode determination means and selects an economy mode. When the power mode is selected, the power mode output reduction amount setting means is selected, and the set engine output reduction amount is selected when the power mode is selected. A control device for a vehicle engine with an automatic transmission, wherein the engine output during a shift operation of the automatic transmission is reduced based on the following.