JP3929870B2 - Automatic transmission control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automatic transmission control device that automatically controls a transmission according to a traveling state detected during traveling of a vehicle, and more particularly, to a driver's accelerator depression amount during automatic traveling by a cruise control function. The present invention relates to an automatic transmission control device that can automatically control a transmission in the same way as during normal driving even when it is not possible.
[0002]
[Prior art]
Conventionally, a shift point for 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 and decelerate the vehicle travel, and the load degree of the vehicle is estimated by looking at the steady state of the accelerator opening and the engine speed. (For example, refer nonpatent literature 1).
[0003]
[Non-Patent Document 1]
No.9806 JSAE SYMPOSIUM “Latest Power Transmission System Technology '98” Japan Society for Automotive Engineers, November 13, 1998, page 30 [0004]
[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 having a cruise control function that enables automatic traveling (auto cruise) by setting the traveling speed of the vehicle to an arbitrary constant speed. In the vehicle having the means, during the cruise control of the automatic traveling, the driver travels with his / her foot away from the accelerator pedal, so the load degree of the vehicle cannot be estimated from the accelerator opening. Therefore, a new automatic shift determination control unit that estimates the degree of load from the fuel injection amount and the engine speed, which shows the substitute characteristics, is newly incorporated, and the shift of the concept is completely different from the conventional one. A map needs to be created. Therefore, the efficiency may be deteriorated, for example, conventional experience cannot be applied to parameter setting for vehicle running characteristic tuning.
[0005]
Therefore, the present invention addresses such problems and automatically controls the transmission in the same manner as during normal driving even when the driver's accelerator depression amount cannot be referred to during automatic driving by the cruise control function. It is an object of the present invention to provide an automatic transmission control device that can perform this.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, an automatic transmission control apparatus according to the present invention controls the engine drive based on an intake air amount detecting means for detecting an intake air amount of an engine, a signal of the detected intake air amount, and the traveling speed of the vehicle. Is an automatic transmission control device having engine control means having a cruise control function that enables automatic driving by setting the vehicle to an arbitrary constant speed and transmission control means for controlling the transmission according to the running state of the vehicle. Means for determining whether or not the cruise control is being performed by the cruise control function, and when it is determined that the cruise control is being performed, the reference of the detected intake air amount is interrupted, and the intake air amount and the engine The reference to the shift map based on the engine speed is interrupted. Instead, it is calculated from the fuel injection amount and the engine speed to maintain an arbitrary constant speed during cruise control. With reference to the pseudo intake air amount, it is obtained so as to control the transmission by referring to the special shift map based on the pseudo intake air amount and the engine speed.
[0007]
With such a configuration, it is determined by the cruise control determination means whether or not the engine is under cruise control by the cruise control function, and if it is determined that the cruise control is in progress, reference to the detected intake air amount is interrupted. At the same time, reference to the shift map based on the intake air amount and the engine speed is interrupted, and instead, a pseudo intake air amount calculated from the fuel injection amount and the engine speed for maintaining an arbitrary constant speed during cruise control. And the transmission is controlled with reference to a dedicated shift map based on the pseudo intake air amount and the engine speed. Thereby, even when the driver's accelerator depression amount cannot be referred to during the automatic driving by the cruise control function, the transmission can be automatically controlled to change the speed as in the normal driving.
[0008]
The intake air amount detecting means may detect the accelerator opening of the engine.
The intake air amount detecting means may detect the intake pressure of the intake system of the engine.
[0009]
DETAILED DESCRIPTION OF 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 apparatus according to the present invention as an overall configuration including an engine. This 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, and a passenger car. In FIG. A transmission (transmission) 4 is attached. 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 through an accelerator opening sensor 7.
[0010]
The accelerator opening sensor 7 detects the opening of the accelerator that is opened and closed by the driver's operation of the accelerator pedal 8, and corresponds to an intake air amount detecting means. The intake air amount detecting means is not limited to the accelerator opening sensor 7, and may be other means as long as it corresponds to means for detecting an amount proportional to the intake air amount of the engine 2. For example, the intake pressure of the intake system of the engine may be detected.
[0011]
An engine control unit 6 is connected to the accelerator opening sensor 7 by electric wiring. This engine control unit 6 serves as an engine control means for controlling the driving of the engine 2 by inputting the accelerator opening signal detected by the accelerator opening sensor 7. In the present invention, the traveling speed of the vehicle is arbitrarily set. The vehicle is provided with a cruise control function that enables automatic traveling (autocruise) by setting a constant speed. The output signal from the engine control unit 6 is sent to a fuel injection device 9 attached to the engine 2. The output signal indicating that the cruise control function is in cruise control and the actual accelerator opening signal detected by the accelerator opening sensor 7 are sent to the transmission control unit 5.
[0012]
A transmission control unit 5 is connected to the transmission 4 by electric wiring. The transmission control unit 5 serves as a transmission control means for controlling the transmission 4 in accordance with the traveling state of the vehicle. The transmission control unit 5 includes 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 engagement switch 14 and a clutch disengagement 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 the gear position of the transmission 4.
[0013]
The control content signal from the transmission control unit 5 is sent to the engine control unit 6 described above. The control content signal is sent to the display monitor 17 and the buzzer 18 to inform the driver.
[0014]
Here, in the present invention, a cruise control determination means for determining whether or not the cruise control function is performing cruise control based on a signal indicating that the engine control unit 6 is performing cruise control is provided in the transmission control unit 5. When it is determined that the cruise control is being performed, reference to the actual accelerator opening degree sent from the engine control unit 6 is interrupted based on the accelerator opening degree sensor 7, and the actual accelerator opening degree and the engine speed are Reference to the shift map for the accelerator opening is interrupted, and instead, referring to the pseudo accelerator opening calculated from the fuel injection amount and the engine speed for maintaining an arbitrary constant speed during cruise control, Refer to the shift map for the pseudo accelerator position based on the pseudo accelerator position and the engine speed. It is obtained so as to control the transmission 4.
[0015]
With this configuration, even when the vehicle cannot refer to the driver's accelerator depressing amount during auto-cruising by the cruise control function, the transmission 4 can be automatically controlled to shift as in normal driving.
[0016]
Next, the operation of the automatic transmission control apparatus configured as described above 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, as to the state of cruise control performed by the cruise control function, initially a cruise control flag = 0 is set (step S1).
[0017]
Next, it is determined whether cruise control is being performed (step S2). That is, it is determined by the cruise control function whether or not automatic traveling (auto cruise) is in progress. If it is not during auto-cruise, proceed to "NO" and jump to step S5. Then, the cruise control flag 0 set in step S1 is output as it is (step S5).
[0018]
On the other hand, if it is determined in step S2 that cruise control is being performed, the process proceeds to "YES" and enters step S3. As for the fuel injection amount of the engine 2, the cruise control injection amount for maintaining an arbitrary constant speed during the cruise control is detected by the accelerator opening sensor 7 by the operation of the accelerator pedal 8 by the driver. It is determined whether or not it is equal to or smaller than the injection amount calculated from the degree.
[0019]
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, the engine speed signal from the engine speed sensor 10 shown in FIG. 1 and the actual accelerator position signal from the accelerator position sensor 7 are taken in, and these signals are used as the engine speed and the actual accelerator position. This is applied to a fuel injection amount map 20 prepared in advance with the degree as a variable element, and a calculation unit 21 calculates these relationships to calculate the fuel injection amount. This calculation result is always output to the outside.
[0020]
When it is determined that the current control injection amount is larger than the injection amount calculated from the actual accelerator opening, using the value of the fuel injection amount calculated by the above calculation, the auto cruise control is performed. In step S3, the process proceeds to "NO" and enters step S4. Then, a cruise control flag = 1 is set for the state of cruise control performed by the cruise control function. Thereafter, the process proceeds to step S5, and the cruise control in-progress flag = 1 set in step S4 is output.
[0021]
On the other hand, if it is determined in step S3 that the current control injection amount is equal to or less than the injection amount calculated from the actual accelerator opening, the actual accelerator opening by the driver's operation of the accelerator pedal 8 is set to the set speed. As a result, the process proceeds to “YES” to enter step S5, and the cruise control flag = 0 set in step S1 is output as it is.
[0022]
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 cruise control flag output in step S5 in FIG. 2 is input (step S11). Next, the actual accelerator opening is input (step S12). This is a signal input from the engine control unit 6 to read the signal of the actual accelerator opening detected by the accelerator opening sensor 7 shown in FIG.
[0023]
Then, the pseudo accelerator opening is input (step S13). In this case, the data is read from a memory or the like that stores data of the pseudo accelerator opening calculated in advance.
[0024]
Here, the calculation of the pseudo accelerator opening is performed by the pseudo accelerator opening calculator 22 shown in FIG. That is, an engine speed signal from the engine speed sensor 10 shown in FIG. 1 and a fuel injection amount signal controlled to maintain an arbitrary constant speed during cruise control are fetched, and these signals are obtained. Then, it is applied to a pre-created pseudo accelerator opening map 23 having the engine speed and the fuel injection amount as variable elements, and these relations are calculated by the calculator 24 to calculate the pseudo accelerator opening. ing. This calculation result is always output to the outside.
[0025]
Next, it is determined whether or not the cruise control flag = 1 (step S14). That is, it is determined by the cruise control function whether or not automatic traveling (auto cruise) is in progress. When the cruise control flag is not 1 (not during auto-cruise), the routine proceeds to “NO” and enters step S15. After referring to the actual accelerator opening detected by the accelerator opening sensor 7, The shift map for the accelerator opening is referred to (step S16). And it progresses to below-mentioned step S19.
[0026]
On the other hand, when the cruise control flag = 1 in step S14 (during auto-cruise), the routine proceeds to “YES” and enters step S17, and the pseudo accelerator opening calculated by the pseudo accelerator opening calculator 22 shown in FIG. Then, the shift map for the pseudo accelerator opening created by using the calculated pseudo accelerator opening is referred to (step S18). And it progresses to below-mentioned step S19.
[0027]
Note that step S14 described above serves as cruise control determination means for determining whether or not the cruise control is being performed by the cruise control function, and is detected when it is determined that the cruise control is not being performed ("NO" side of step S14). When switching to refer to the actual accelerator opening and the shift map for the actual accelerator opening based on the actual accelerator opening and the engine speed, it is determined that the cruise control is being performed ("YES" in step S14) The “side” refers to the pseudo accelerator opening calculated from the fuel injection amount and the engine speed, and switches so as to refer to the shift map for the pseudo accelerator opening based on the pseudo accelerator opening and the engine speed. It has become.
[0028]
Thereafter, it is determined whether or not the conditions for starting automatic shift are satisfied according to the actual accelerator opening and the shift map for actual accelerator opening or according to the pseudo accelerator opening and the shift map for pseudo accelerator opening. (Step S19). If the automatic shift start condition is not yet established, the process proceeds to “NO”, returns to step S11, and steps S11 to S18 are repeated.
[0029]
If the automatic shift start condition is satisfied, the routine proceeds to “YES”, enters step S20, performs predetermined shift control by normal automatic shift control, and ends.
[0030]
By such an operation, even when the vehicle cannot refer to the accelerator depression amount during the auto cruise by the cruise control function, the transmission 4 can be automatically subjected to the shift control in the same manner as during normal driving.
[0031]
In the above description, as a determination element whether or not the automatic shift start condition is satisfied, 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 other maps may be used as long as the amount is proportional to the intake air amount of the engine 2. For example, the intake pressure of the intake system of the engine is It may be used to determine whether or not an automatic shift start condition is satisfied. That is, the actual suction pressure detected for the engine 2 and the shift map for the actual suction pressure may be referred to, or the pseudo suction pressure and the shift map for the pseudo suction pressure obtained by calculation may be referred to.
[0032]
【The invention's effect】
Since the present invention is configured as described above, according to the first to third aspects of the present invention, the cruise control determination means determines whether the engine is in cruise control with the cruise control function and is in cruise control. If it is determined, the reference of the detected intake amount is interrupted, and the reference of the shift map based on the intake amount and the engine speed is interrupted, and instead maintained at an arbitrary constant speed during cruise control. The transmission is controlled by referring to the pseudo intake air amount calculated from the fuel injection amount and the engine speed for performing the engine and referring to a dedicated shift map based on the pseudo intake air amount and the engine speed. it can. Thus, even when the driver's accelerator depression amount cannot be referred to during the automatic traveling by the cruise control function, the transmission can be automatically controlled to shift as in the normal traveling. Therefore, it is not necessary to create a shift map having a completely different concept from the conventional one, and the conventional experience can be applied to parameter setting for vehicle driving characteristic tuning, thereby preventing a reduction in efficiency.
[Brief description of the drawings]
FIG. 1 is an explanatory perspective view showing an embodiment of an automatic transmission control apparatus according to the present invention as an overall configuration including an engine.
FIG. 2 is a flowchart showing an engine control operation by the engine control unit shown in FIG. 1;
FIG. 3 is a flowchart showing a transmission control operation by the transmission control unit shown in FIG. 1;
FIG. 4 is a block diagram showing 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 showing 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 detection means)
DESCRIPTION OF SYMBOLS 8 ... Accelerator pedal 10 ... Engine speed sensor 11 ... Gear speed sensor 12 ... Vehicle speed sensor 19 ... Fuel injection amount calculating part 22 ... Pseudo accelerator opening calculating part

Claims (3)

An intake air amount detecting means for detecting the intake air amount of the engine and a cruise control function for controlling the driving of the engine by a signal of the detected intake air amount and automatically driving the vehicle by setting the traveling speed to an arbitrary constant speed. An automatic transmission control device having engine control means provided with a transmission control means for controlling the transmission according to the running state of the vehicle,
A means for determining whether or not the cruise control is being performed by the cruise control function is provided. When it is determined that the cruise control is being performed, the reference of the detected intake air amount is interrupted, and the intake air amount and the engine speed are The reference to the shift map based on the engine is interrupted, and instead, the pseudo intake air amount calculated from the fuel injection amount and the engine speed for maintaining an arbitrary constant speed during cruise control is referred to, and An automatic transmission control apparatus, wherein a transmission is controlled with reference to a dedicated shift map based on an intake air amount and an engine speed. 2. The automatic transmission control device according to claim 1, wherein the intake air amount detecting means detects an accelerator opening of the engine. 2. The automatic transmission control device according to claim 1, wherein the intake air amount detecting means detects an intake pressure of an intake system of the engine.

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