JP2004150462A - Automatic gear shift control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically control a transmission similarly as ordinary traveling, even when an engine rotating state corresponding to the stepping amount of an accelerator pedal is not achieved by a car speed limiting function. <P>SOLUTION: This automatic transmission having an accelerator opening degree sensor 7, an engine control unit 6 having a car speed limiting function for controlling a car speed to less than a specific limit value, and a transmission control unit 5, further comprises a means for determining whether a car speed is limited by the car speed limiting function or not. In a case when the car speed is limited, the reference to the detected accelerator opening degree, and the reference to a gear shift map based on the accelerator opening degree and an engine rotating speed are interrupted, but the transmission 4 is controlled in reference to the pseudo accelerator opening degree calculated based on the fuel injection amount controlled to limit a travelling speed of the vehicle to less than a limit value, and the engine rotating speed, and an exclusive gear shift map based on the pseudo accelerator opening degree and the engine rotating speed. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an automatic transmission control device that automatically controls a transmission in accordance with a traveling state detected during traveling of a vehicle. The present invention relates to an automatic transmission control device that can automatically control the transmission in the same manner as during normal running, even when the engine is not rotating according to the amount of depression of the accelerator pedal.
[0002]
[Prior art]
Conventionally, a shift point of transmission control in an automatic or semi-automatic shift control device for a vehicle is generally determined by a shift map based on an accelerator opening and an engine speed. This is because the accelerator opening is suitable for detecting the driver's intention to accelerate or decelerate the vehicle, and the load of the vehicle is estimated by checking the state of the steady accelerator opening and the engine speed. (For example, see Non-Patent Document 1).
[0003]
Also, in order to respond to the speeding up of vehicles accompanying the development of expressways, the output of engines and the number of stages of transmissions are increasing, but at the same time, the reduction of operating costs by improving fuel efficiency is also required. I have. Therefore, in order to improve fuel efficiency, it is conceivable to limit the maximum engine speed to a low speed. For example, the normal fuel supply amount obtained from the accelerator opening and the engine speed is compared with the fuel supply amount for vehicle speed limitation obtained from the vehicle speed so that the vehicle speed is suppressed to a predetermined limit value or less. There is a technology in which the maximum speed of engine rotation is limited by selecting the fuel supply amount of the engine and reducing the fuel supply amount to the engine (for example, see Patent Document 1).
[0004]
[Non-patent document 1]
No. 9806 JSAE SYMPOSIUM "The Latest Technology of Power Transmission System '98", Japan Society of Automotive Engineers, November 13, 1998, p. 30 [Patent Document 1]
JP-A-10-252520 (page 2)
[0005]
[Problems to be solved by the invention]
However, in a vehicle equipped with such a conventional automatic or semi-automatic shift control device, an engine control means having a vehicle speed limiting function for narrowing the fuel injection amount so as to keep the running speed of the vehicle below a predetermined limit value. When the vehicle speed limiting function of the engine control means is operating, the fuel injection amount is limited by the control of the engine side, so that the original engine rotation state according to the driver's accelerator pedal depression amount can be obtained. Will not be. For this reason, for example, when accelerating from a low gear position, it is not possible to reach a predetermined shift-up engine speed corresponding to the accelerator opening, and if the driver releases the accelerator pedal, the vehicle is held at an intermediate gear position. Sometimes you can't shift up. In addition, even if the accelerator pedal is depressed, acceleration cannot be obtained, and a high load state such as climbing a slope may be erroneously recognized.
[0006]
From these facts, an automatic shift determination control unit that estimates the load degree from the fuel injection amount and the engine speed, which indicates the substitute characteristics, is newly incorporated, and the concept is completely different from the conventional one. A shift map needs to be created. Therefore, efficiency may be deteriorated, for example, in that conventional experience cannot be applied to parameter acquisition of vehicle running characteristic tuning.
[0007]
Therefore, the present invention addresses such a problem, and the vehicle travels with the fuel injection amount reduced by the vehicle speed limiting function, and even when the engine is not rotating according to the depression amount of the accelerator pedal of the driver, the vehicle travels normally. It is an object of the present invention to provide an automatic transmission control device capable of automatically controlling a transmission as in the case of the automatic transmission.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, an automatic transmission control device according to the present invention includes an intake air amount detecting means for detecting an intake air amount of an engine, a drive of the engine based on a signal of the detected intake air amount, and a running speed of a vehicle. Automatic transmission control having an engine control means having a vehicle speed limiting function of causing the vehicle to travel with a reduced fuel injection amount so as to keep the fuel injection amount at or below a predetermined limit value, and a transmission control means for controlling a transmission according to a traveling state of the vehicle The apparatus further comprises means for determining whether or not the vehicle speed is being limited by the vehicle speed limiting function. When it is determined that the vehicle speed is being limited, the reference of the detected intake air amount is interrupted and the intake air is stopped. The reference to the shift map based on the amount and the engine speed is interrupted, and instead, the fuel injection amount and the engine speed controlled to suppress the vehicle traveling speed to a predetermined limit value or less are used. With reference to the pseudo intake air amount issued, but which is adapted to control the transmission by referring to the special shift map based on the pseudo intake air amount and the engine speed.
[0009]
With such a configuration, the vehicle speed limit determining unit determines whether or not the engine is under the vehicle speed limit by the vehicle speed limit function, and when it is determined that the vehicle speed is being limited, the reference of the detected intake air amount is interrupted. At the same time, the reference to the shift map based on the intake air amount and the engine speed is interrupted, and instead, a pseudo fuel calculated from the fuel injection amount and the engine speed controlled so as to suppress the traveling speed of the vehicle to a predetermined limit value or less. The transmission is controlled by referring to a suitable intake air amount and a dedicated shift map based on the pseudo intake air amount and the engine speed. As a result, even when the vehicle is running with the fuel injection amount reduced by the vehicle speed limiting function and the engine is not rotating according to the amount of depression of the accelerator pedal by the driver, the transmission is automatically shifted in the same manner as during normal driving. Make it possible.
[0010]
The intake air amount detecting means may detect an accelerator opening of the engine.
Further, the intake amount detecting means may detect an intake pressure of an intake system of the engine.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a perspective explanatory view showing an embodiment of an automatic transmission control device according to the present invention as an entire configuration including an engine. The automatic transmission control device 1 automatically controls a transmission in accordance with a traveling state detected during traveling of a vehicle such as a truck, a bus, a passenger car, etc. In FIG. A transmission (transmission) 4 is attached via the transmission. A transmission control unit 5 is connected to the transmission 4 by electric wiring. An engine control unit 6 is connected to the engine 2 by electric wiring, and an accelerator pedal 8 is connected to the engine control unit 6 via an accelerator opening sensor 7.
[0012]
The accelerator opening sensor 7 detects the opening of the accelerator that is opened and closed by the driver operating the accelerator pedal 8, and corresponds to intake air amount detecting means. The intake air amount detecting means is not limited to the accelerator opening sensor 7, but may be any other means for detecting an amount proportional to the intake air amount of the engine 2. It may detect the suction pressure of the system.
[0013]
The engine control unit 6 is connected to the accelerator opening sensor 7 by electric wiring. The engine control unit 6 serves as an engine control means for controlling the driving of the engine 2 by inputting a signal of the accelerator opening detected by the accelerator opening sensor 7. The vehicle is provided with a vehicle speed limiting function that allows the vehicle to travel with a reduced fuel injection amount so as to keep the vehicle speed below the limit value. The output signal from the engine control unit 6 is sent to a fuel injection device 9 attached to the engine 2. The signal indicating that the vehicle speed limiting function is operating and the actual accelerator opening signal detected by the accelerator opening sensor 7 are sent to the transmission control unit 5.
[0014]
A transmission control unit 5 is connected to the transmission 4 by electric wiring. The transmission control unit 5 serves as transmission control means for controlling the transmission 4 in accordance with the running state of the vehicle. The transmission control unit 5 receives signals from an engine speed sensor 10, a gear speed sensor 11 attached to the transmission 4, and a vehicle speed sensor 12. A signal is input and signals from a clutch connection switch 14 and a clutch disconnection switch 15 provided on the clutch pedal 13 are input and controlled. The transmission control unit 5 is connected to a shift tower 16 having a shift lever for switching a gear of the transmission 4.
[0015]
The control content signal from the transmission control unit 5 is sent to the engine control unit 6 described above. Further, the control content signal is sent to the display monitor 17 and the buzzer 18 so as to notify the driver.
[0016]
Here, in the present invention, the transmission control unit 5 includes a vehicle speed limit determining unit that determines whether the vehicle speed is being limited by the vehicle speed limiting function based on a signal indicating that the vehicle speed is being limited by the engine control unit 6. If it is determined that the vehicle speed is being limited, the reference to the actual accelerator opening transmitted from the engine control unit 6 based on the accelerator opening sensor 7 is interrupted, and the actual accelerator opening based on the actual accelerator opening and the engine speed is stopped. The reference to the shift map for the accelerator opening is interrupted, and instead, the pseudo accelerator opening calculated from the fuel injection amount and the engine speed controlled to keep the vehicle running speed below a predetermined limit value is referred to. At the same time, referring to the shift map for the simulated accelerator opening based on the simulated accelerator opening and the engine speed, a It is obtained so as to control the mission 4.
[0017]
With this configuration, even when the vehicle is traveling with the fuel injection amount reduced by the vehicle speed limiting function and the original engine rotation state cannot be obtained in accordance with the driver's depression amount of the accelerator pedal, normal traveling can be performed. As in the case of the transmission, the transmission 4 can be automatically shifted.
[0018]
Next, the operation of the thus configured automatic transmission control device will be described with reference to FIGS. First, FIG. 2 is a flowchart showing a control operation of the engine 2 by the engine control unit 6 shown in FIG. First, regarding the vehicle speed limiting state performed by the vehicle speed limiting function, a vehicle speed limiting flag = 0 is first set (step S1).
[0019]
Next, as for the fuel injection amount of the engine 2, the current control injection amount is equal to or higher than the injection amount calculated from the actual accelerator opening detected by the accelerator opening sensor 7 by the operation of the accelerator pedal 8 by the driver. It is determined whether it is smaller (step S2).
[0020]
Here, the calculation of the fuel injection amount of the engine 2 is performed by the fuel injection amount calculation unit 19 shown in FIG. That is, a signal of the engine speed from the engine speed sensor 10 shown in FIG. 1 and a signal of the actual accelerator opening from the accelerator opening sensor 7 are fetched, and these signals are taken as the engine speed and the actual accelerator opening. The fuel injection amount is calculated by applying the relationship to a previously created fuel injection amount map 20 having the degree as a variable element, and calculating these relations by an arithmetic unit 21. The result of this operation is always output to the outside.
[0021]
If the current control injection amount is determined to be larger than the injection amount calculated from the actual accelerator opening by using the value of the fuel injection amount obtained by the calculation as described above, the vehicle speed return control is performed. And jumps to the "NO" side to jump to step S4. Then, the in-vehicle-speed-limiting flag = 0 set in step S1 is output as it is (step S4).
[0022]
On the other hand, when it is determined in step S2 that the current control injection amount is equal to or less than the injection amount calculated from the actual accelerator opening, the control injection amount is being narrowed, and the process proceeds to “YES”. It enters step S3. Then, regarding the state of the vehicle speed limitation performed by the vehicle speed limitation function, the vehicle speed limitation flag = 1 is set. Thereafter, the process proceeds to step S4, and the vehicle speed limitation flag = 1 set in step S3 is output.
[0023]
Next, FIG. 3 is a flowchart showing a control operation of the transmission 4 by the transmission control unit 5 shown in FIG. First, the vehicle speed limiting flag output in step S4 of FIG. 2 is input (step S11). Next, the actual accelerator opening is input (step S12). This is to input and read a signal of the actual accelerator opening detected by the accelerator opening sensor 7 shown in FIG.
[0024]
Then, the pseudo accelerator opening is input (step S13). This is to read the data from a memory or the like in which data of the pseudo accelerator opening calculated in advance is stored.
[0025]
Here, the calculation of the pseudo accelerator opening is performed by the pseudo accelerator opening calculator 22 shown in FIG. That is, a signal of the engine speed from the engine speed sensor 10 shown in FIG. 1 and a signal of the fuel injection amount controlled so as to suppress the running speed of the vehicle to a predetermined limit value or less when the vehicle speed limiting function is operating. These signals are applied to a pre-created pseudo accelerator opening map 23 having the engine speed and the fuel injection amount as variable elements, and the relationship between them is calculated by a computing unit 24 to generate a pseudo-acceleration. The accelerator opening is calculated. The result of this operation is always output to the outside.
[0026]
Next, it is determined whether or not the vehicle speed limit flag = 1 (step S14). That is, it is determined whether the vehicle speed is being limited by the vehicle speed limiting function. If the vehicle speed limitation flag is not 1 (the vehicle speed limitation is not being performed), the process proceeds to “NO” and the process proceeds to step S15, where the actual accelerator opening detected by the accelerator opening sensor 7 is referred to, The shift map for the accelerator opening is referred to (step S16). Then, the process proceeds to step S19 described below.
[0027]
On the other hand, if the vehicle speed limit flag is 1 in step S14 (vehicle speed limit is in progress), the process proceeds to the "YES" side to enter step S17, and the pseudo accelerator opening calculated by the pseudo accelerator opening calculator 22 shown in FIG. After that, a shift map for the pseudo accelerator opening created using the obtained pseudo accelerator opening is referred to (step S18). Then, the process proceeds to step S19 described below.
[0028]
It should be noted that the above-described step S14 serves as a vehicle speed limit determining means for determining whether or not the vehicle speed is being limited by the vehicle speed limiting function. In addition to referring to the actual accelerator opening and referring to the actual accelerator opening and a shift map for the actual accelerator opening based on the engine speed, it is determined that the vehicle speed is being limited ("YES" in step S14). The “) side refers to the pseudo-accelerator opening calculated from the fuel injection amount and the engine speed controlled to keep the running speed of the vehicle below a predetermined limit value, and determines the pseudo-accelerator opening and the engine speed. It is configured to switch so as to refer to the shift map for the pseudo accelerator opening based on the accelerator shift.
[0029]
Thereafter, it is determined whether or not the condition for starting the automatic shift is satisfied according to the actual accelerator opening and the shift map for the actual accelerator opening, or according to the pseudo accelerator opening and the shift map for the pseudo accelerator opening. (Step S19). If the automatic shifting start condition has not yet been satisfied, the process proceeds to the “NO” side, returns to step S11, and repeats the above steps S11 to S18.
[0030]
If the automatic shift start condition is satisfied, the process proceeds to the "YES" side to enter step S20, performs predetermined shift control by normal automatic shift control, and ends.
[0031]
With such an operation, even when the vehicle is traveling with the fuel injection amount reduced by the vehicle speed limiting function and the original engine rotation state according to the driver's accelerator pedal depression amount cannot be obtained, it is compared with normal traveling. Similarly, the transmission 4 can be automatically shifted.
[0032]
In the above description, the shift map for the actual accelerator opening and the actual accelerator opening, or the pseudo accelerator opening and the pseudo accelerator opening However, the present invention is not limited to this, and any other map may be used as long as the amount is proportional to the amount of intake air of the engine 2. For example, the intake pressure of the intake system of the engine may be reduced. Alternatively, it may be determined whether or not the condition for activating the automatic transmission is satisfied. That is, a shift map for the actual suction pressure and the actual suction pressure detected for the engine 2 may be referred to, or a shift map for the pseudo suction pressure and the pseudo suction pressure obtained by calculation may be referred to.
[0033]
【The invention's effect】
Since the present invention is configured as described above, according to the inventions according to claims 1 to 3, the vehicle speed limit determining means determines whether or not the engine is under the vehicle speed limit by the vehicle speed limiting function. If it is determined that the vehicle is running, the reference of the detected intake air amount is interrupted, and the reference of the shift map based on the intake air amount and the engine speed is interrupted. The transmission is controlled by referring to the pseudo intake air amount calculated from the fuel injection amount and the engine speed controlled so as to suppress the engine speed, and by referring to a dedicated shift map based on the pseudo intake air amount and the engine speed. can do. As a result, even when the vehicle is running with the fuel injection amount reduced by the vehicle speed limiting function and the engine is not rotating according to the amount of depression of the accelerator pedal by the driver, the transmission is automatically shifted in the same manner as during normal driving. can do. Therefore, there is no need to create a shift map having a concept completely different from that of the related art, and the conventional experience can be applied to parameter acquisition for tuning of the running characteristics of the vehicle, thereby preventing a reduction in efficiency.
[Brief description of the drawings]
FIG. 1 is a perspective explanatory view showing an embodiment of an automatic transmission control device according to the present invention as an overall configuration including an engine.
FIG. 2 is a flowchart showing an operation of controlling the engine by the engine control unit shown in FIG. 1;
FIG. 3 is a flowchart showing a control operation of the transmission by the transmission control unit shown in FIG. 1;
FIG. 4 is a block diagram illustrating an internal configuration of a fuel injection amount calculation unit that calculates a fuel injection amount of the engine.
FIG. 5 is a block diagram illustrating an internal configuration of a pseudo accelerator opening calculation unit that calculates a pseudo accelerator opening.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Automatic transmission control apparatus 2 ... Engine 4 ... Transmission (transmission)
5 Transmission control unit 6 Engine control unit 7 Accelerator opening sensor (intake air amount detecting means)
8 accelerator pedal 10 engine speed sensor 11 gear speed sensor 12 vehicle speed sensor 19 fuel injection amount calculation unit 22 pseudo accelerator opening degree calculation unit

Claims (3)

An intake air amount detecting means for detecting an intake air amount of the engine, and driving of the engine is controlled by a signal of the detected intake air amount, and the vehicle is run with a reduced fuel injection amount so as to keep the running speed of the vehicle below a predetermined limit value. An automatic transmission control device including an engine control unit having a vehicle speed limiting function and a transmission control unit that controls a transmission according to a traveling state of the vehicle,
Means for determining whether or not the vehicle speed is being limited by the vehicle speed limiting function. If it is determined that the vehicle speed is being limited, reference to the detected intake air amount is interrupted, and the intake air amount and the engine speed are stopped. The reference to the shift map based on is interrupted, and instead, the pseudo-intake amount calculated from the fuel injection amount and the engine speed controlled to suppress the traveling speed of the vehicle to a predetermined limit value or less is referred to. An automatic transmission control device wherein the transmission is controlled with reference to a dedicated transmission map based on a pseudo intake air amount and an engine speed. 2. The automatic transmission control device according to claim 1, wherein said intake air amount detecting means detects an accelerator opening of the engine. 2. The automatic transmission control device according to claim 1, wherein said intake air amount detecting means detects an intake pressure of an intake system of the engine.

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