JPH04100740A - Integrated control device of engine with automatic transmission for vehicle - Google Patents

Abstract

PURPOSE:To ensure the optimum driving performance according to the driving feeling of a driver by setting a target driving shaft torque of a transmission according to the vehicle operating condition, and controlling an engine and a speed change step of an automatic transmission in such a manner that the actual driving shaft torque comes to the above target torque. CONSTITUTION:Detection signals are input from a throttle opening sensor 8 and a car velocity sensor 9. According to the signals, a target driving shaft torque of a driving shaft 3 is retrieved from a map, According to the retrieved torque, a throttle valve 5 is controlled to come to a target throttle opening. A throttle driving device 6 conducts the feed-back control in such a manner that the opening of the valve 5 comes to the target throttle opening. Them maximum driving shaft torque which can be attained in each speed change step is stored for every speed change step, and the stored torque and the target driving shaft torque are sequentially compared to decide such a speed change step that the actual driving shaft torque reaches the target driving shaft torque. A solenoid valve for operating oil of an automatic transmission 2 is driven to operate the respective speed change elements. The speed change is controlled by inputting the data from an engine control device 7 to a speed change control device 10. Thus, the driving performance which matches the driving feeling of a driver can be ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to a comprehensive control device that controls an engine and an automatic transmission in order to ensure the required torque requested by a driver.

<Prior Art> As a conventional example of this type of comprehensive control device, there is the following (see Japanese Patent Application No. 1-150169).

In other words, the target output shaft torque of the engine (hereinafter referred to as engine target shaft output torque) is determined based on the amount of operation of the accelerator pedal, and the opening of the throttle valve is adjusted so that the actual engine output shaft torque or the engine target output shaft torque is achieved. is controlled by the motor using feedback. Furthermore, the gear position is searched from the shift schedule map based on the engine target output shaft torque (also the output shaft torque of the torque converter obtained from the target output shaft torque) and the vehicle speed, and the automatic transmission is installed in the searched gear position. I'm trying to change gears.

Here, the reason why the gear stage of the automatic transmission is determined based on the engine target output shaft torque (or the output shaft torque of the torque converter) and the vehicle speed is as follows.

In other words, when the throttle valve is feedback-controlled by a motor according to the accelerator pedal operation amount, the throttle valve opening and the accelerator pedal operation amount (opening) are not necessarily the same, and for example, during sudden acceleration, the throttle valve opening may change suddenly. It fluctuates. For this reason, if the gear position of an automatic transmission is determined based on the throttle valve opening and vehicle speed, as the throttle valve opening hunts during sudden acceleration, the gear position may be switched and the drivability may deteriorate. could be. Furthermore, when determining the gear position based on the accelerator pedal operation amount (opening degree) instead of the throttle valve opening degree, the accelerator pedal operation amount is not a value that accurately indicates the operating state of the engine, so consistency is not guaranteed. Poor.

Therefore, the gear position of the automatic transmission is determined from the engine target output shaft torque and the vehicle speed.

<Problem to be solved by the invention> However, in such a conventional comprehensive control device, the target engine torque on eight shafts is determined, and the output shaft torque of the engine is controlled so as to reach the engine target output shaft torque. However, since the gear stage of the automatic transmission is determined based on the target output shaft torque of the engine or the output shaft torque of the torque converter and the vehicle speed, optimum drivability according to the driver's demands cannot be ensured. There is a problem.

The present invention was made in view of the above-mentioned circumstances, and an object of the present invention is to provide a comprehensive control device that can ensure optimal drivability in accordance with the driving sensation of the driver.

<Means for Solving the Problems> Therefore, as shown in FIG. 1, the present invention transmits the engine A output to the drive shaft via the automatic transmission B.
a driving state detection means C for detecting the driving state of the vehicle; a target drive shaft torque setting means for setting a target drive shaft torque of the drive shaft based on the detected driving state; a control amount setting means F for setting a control WJ amount for a control object E of the engine in order to follow the actual drive shaft torque; a drive control means G for driving and controlling the control object E based on the set control amount; The device is equipped with a gear setting means H for setting the gear based on the target drive shaft torque, and a gear operating means (2) for operating the gear of the automatic transmission B to the set gear.

In this way, the target drive shaft torque of the drive shaft on the pressure side of the transmission is set based on the vehicle operating condition, and the control target of the engine is set so that the actual drive shaft torque matches this target drive shaft torque. and the gear position of the automatic transmission.

<Example> Embodiments of the present invention will be described below based on the drawings.

2 to 5 show a first embodiment of the present invention.

In FIG. 2, the output of an engine 1 is transmitted to a drive shaft 3 via a torque converter (not shown) and an automatic transmission 2. A throttle valve 5 as a controlled object is interposed in the intake passage 4 of the engine 1, and the throttle valve 5 is driven to open and close by a throttle valve driving device 6 as a drive control means to be described later.

Further, the engine control device 7 receives detection signals from an accelerator opening sensor 8 that detects the opening (operation amount) of the accelerator pedal, and a vehicle speed sensor 9. Further, a shift control device 1O is provided to change the gears of the automatic transmission 2, and control data is inputted to the shift control device 10 from the engine control device 7 through mutual communication signals. The automatic transmission 2 is equipped with a planetary gear device, and its gear shifting operation is performed by releasing one gear shifting element (clutch) and engaging the other. It is equipped with multiple solenoid valves that supply hydraulic fluid to the elements. The solenoid valve is actuated by a signal from the speed change control device 10 to perform a speed change operation.

As shown in FIG. 3, the throttle drive device 6 includes:
A servo motor 11 that drives the throttle valve 5 to open and close, and a servo drive circuit 12 that operates the servo motor 11 are provided. Based on the throttle opening detected by the throttle sensor 13, the surf drive circuit 11 controls the throttle via the surf motor 12 so that the actual throttle opening becomes the actual throttle opening or the target throttle opening input from the engine control device 7. The opening degree of the valve 5 is feedback-controlled. Reference numeral 14 in FIG. 3 represents a fuel injection valve driven by the engine control device 7.

Here, the engine control device 7 constitutes the target drive shaft torque setting means and the control amount setting means, and the transmission control device 10 constitutes the gear stage setting means and the shift operation means. Further, the accelerator opening sensor 8 and the vehicle speed sensor 9 constitute driving state detection means.

Next, the operation will be explained according to the flowchart shown in FIG.

At Sl, detection signals are read from the throttle opening sensor 8 and vehicle speed sensor 9.

In S2, the target drive shaft torque of the drive shaft 3, which is the output side of the automatic transmission 2, is searched from the map based on the detected accelerator opening degree and vehicle speed. This target drive shaft torque is
As shown in FIG. 5, it is set to increase as the accelerator opening increases and as the vehicle speed increases.

In S3, the throttle valve 5 is controlled to reach the target throttle opening based on the retrieved target drive shaft torque. Specifically, a target throttle opening degree is searched from a map based on the target drive shaft torque and the actual engine rotational speed, and a control signal corresponding to this target throttle opening degree is output to the throttle drive device 6. Then, the throttle drive device 6 performs feedback control so that the opening degree of the throttle valve 5 becomes the target throttle opening degree. Here, since the output shaft torque of the engine l is controlled by controlling the opening degree of the throttle valve 5, the target throttle opening is adjusted so that the actual drive shaft torque or the target drive shaft torque is achieved, taking into consideration the transmission efficiency of the torque converter. The degree is set.

In S4, shift control of the automatic transmission is performed based on the retrieved target drive shaft torque. Specifically, the maximum drive shaft torque that can be achieved at each gear stage (the drive shaft torque at the maximum throttle valve opening in each gear stage) is stored for each gear stage, and this maximum drive shaft torque and the target drive shaft The gear position that achieves the actual drive shaft torque or the target drive shaft torque is determined by sequentially comparing the torque and the target drive shaft torque. Then, the hydraulic oil solenoid valve of the automatic transmission 2 is driven to operate each shift element so as to achieve the determined gear stage, thereby performing a shift operation.

Here, the speed change control is performed by the speed change control device IO by inputting data from the engine control device 7.

As explained above, the target drive shaft torque of the drive shaft 3 is determined based on the accelerator opening degree and the vehicle speed, and the opening degree of the throttle valve 5 is controlled so that the actual drive shaft torque becomes equal to the target drive shaft torque. Since the automatic transmission 2 is operated to change gears, the optimum actual drive shaft torque corresponding to the driving sensation of the driver can be ensured, thereby ensuring drivability that matches the driving sensation of the driver.

Next, a second embodiment of the present invention will be described based on FIGS. 6 to 9. The specific configuration of the embodiment is the same as that shown in FIG. 2, so the explanation will be omitted, and the same elements will be described with the same reference numerals as in FIG. 2.

That is, the Sll reads detection signals from the accelerator opening sensor 8 and the vehicle speed sensor 9.

In S12, similarly to S2, the target drive shaft torque is searched from the map based on the detected accelerator opening and vehicle speed.

In S13, a moving average value m of the detected accelerator opening degree ACC and a moving average value Δm of the detected rate of change ΔVSP of the vehicle speed are respectively calculated using the following equations.

In KU = ((N-1) m″Φ + ACC) / NΔTK = ((M-1) Δ7 + ΔV S P IN, M is a constant, Wπτ and Δrτ are the data of the previous routine.

In S14, the pitching degree R is estimated by fuzzy inference based on the calculated r and ΔT.

Specifically, the membership function H(7
v''0'') is set as shown in Fig. 7, and the membership function G (ΔVSTr) indicating the degree of acceleration corresponding to the moving average value ΔvSP of the vehicle speed change rate is set as shown in Fig. 8. These membership functions are determined by experiments and empirical rules, and [
If the accelerator is pressed a lot but the vehicle does not accelerate, the vehicle is running uphill (in other words, if r is large but Δ is small, then the vehicle is running uphill).

Then, calculate the grade H from the calculated τ, and after calculating the grade G from the calculated ΔTKπ, calculate their logical sum X (HUG) (specifically, the smaller of the grade H and the grade G ). and,
Based on the obtained logical sum X, the pitching degree R is determined from the membership function X (R) shown in FIG. This membership function X (R) is determined by empirical rules, etc.
The pitching degree R is set to take an appropriate value (for example, 1.1 to 1.8).

Then, in S15, it is determined whether the estimated pitching degree R is greater than or equal to a predetermined value, and if YES, the process advances to S16 and NO.
In this case, the process proceeds to S17 without passing through S16.

In S16, the target drive shaft torque retrieved in S12 is multiplied by a constant (for example, 1.5) to increase the target drive shaft torque. Note that the target drive shaft torque may be multiplied by the climbing degree R.

In S17, the opening degree of the throttle valve 5 is controlled in the same manner as in S3 above, based on the target drive shaft torque corrected to increase in S16 or the target drive shaft torque retrieved in S12.

In S18, based on the target drive shaft torque corrected to increase in S16 or the target drive shaft torque retrieved in S12, the gear position of the automatic transmission 2 is changed to a gear position that can achieve the target drive shaft torque in the same way as in S4. Operate the gear shift.

In this way, by recognizing when the vehicle is running uphill and increasing the target drive shaft torque, a strong sense of acceleration can be obtained when the vehicle is running uphill.

Here, while driving on a pitch is taken as an example of the driving environment, other driving environments include driving in traffic jams, etc., and the target drive shaft torque can be finely changed according to these driving environments to ensure optimal drivability. Ru.

<Effects of the Invention> As explained above, the present invention sets the target drive shaft torque on the output side of the transmission according to the operating state, and adjusts the engine and the drive shaft torque so that the actual drive shaft torque follows the target drive shaft torque. By controlling the automatic transmission, it is possible to secure the optimum actual drive shaft torque according to the driving sensation of the driver, thereby improving drivability.

[Brief explanation of the drawing]

Fig. 1 is a diagram corresponding to the claims of the present invention, Fig. 2 is a block diagram showing the first embodiment of the present invention, Fig. 3 is a block diagram of the main parts of the same as above, Fig. 4 is a flowchart of the same as above, and Fig. 5 is a block diagram showing the first embodiment of the present invention. FIG. 6 is a flowchart showing a second embodiment of the present invention, and FIGS. 7 to 9 are diagrams for explaining the same operation. 5...Throttle valve 6...Throttle drive device 7...Engine control device 8...Accelerator opening sensor 9...Vehicle speed sensor 10...Shift control device patent applicant Nissan Motor Co., Ltd. agent Patent Attorney Fujio Sasashima 1...Engine 2...Automatic transmission 3...Drive shaft engine female transmission 1 (1)

Claims (1)

[Claims] In a vehicle that transmits engine output to a drive shaft via an automatic transmission, a driving state detection means for detecting a driving state of the vehicle, and a target for setting a target drive shaft torque of the drive shaft based on the detected driving state. a drive shaft torque setting means; a control amount setting means for setting a control amount of a controlled object of the engine so that the actual drive shaft torque follows the set target drive shaft torque; a gear setting means for completely lowering the gear based on the target drive shaft torque; and a shift operating means for shifting the automatic transmission to the set gear; A comprehensive control device for an engine with an automatic transmission for a vehicle, characterized by comprising: