JPH02240449A - Control device for automatic transmission - Google Patents

Abstract

PURPOSE:To improve a feeling by switching a control to a throttle zero opening time-shift pattern when a throttle opening is zero further with acceleration of a vehicle not less than a positive value, preset in accordance with a car speed, while detected operation of an operator or with the acceleration not more than a negative predetermined value. CONSTITUTION:A selecting means 11, being based on signals input from at least a throttle opening detector 5, car speed detector 6, acceleration judging means 7 and an operator operation judging means 12, selects a hydraulic unit control means 10 to a condition controlling a hydraulic unit 3 by a shift pattern stored respectively in a normal running time shift pattern memory means 8 or a throttle zero opening time-shift pattern memory means 9. When a throttle opening is zero further with acceleration of a vehicle not less than a positive value, preset in accordance with a car speed, while with operation of an operator detected or with the acceleration not more than a negative predetermined value, a control is switched to the control by the throttle zero opening time shift pattern.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a control device for an automatic transmission, and in particular to a hydraulic device for controlling a gear transmission installed after a torque converter equipped with a lip-up mechanism. The present invention relates to a control device for controlling.

(Prior art) Conventionally, as a control device for an automatic transmission, apart from the shift pattern for normal driving, the lock-up area is wider than this shift pattern, and the upshift and downshift patterns are set on the high speed side. The shift pattern for zero throttle opening is memorized, and when the throttle is zero, the shift pattern can be switched to the one for zero throttle opening by the operator's operation such as braking, thereby improving the efficiency of engine braking. There was a structure that did this (see Japanese Unexamined Patent Publication No. 62-246857).

(Problem to be Solved by the Invention) In the conventional configuration described above, as shown in FIG. 9, for example, from point Considering the case where the shift pattern is changed to downshift to 2nd gear and the lock-up is engaged, the effect of engine braking increases in proportion to the gear ratio.For example, if the 3rd gear ratio is 1. 000 and 2nd gear ratio is 1.5
In the case of 83, the engine speed increases by 58% even at the same engine speed.

Therefore, this is fine if the operator is requesting a sudden deceleration, but even if the operator depresses the brake pedal slightly to reduce the vehicle speed, the effect of engine braking will increase, resulting in a tramping feeling. There was an inconvenience that it was bad.

(Means for Solving the Problems) In order to solve the above problems, as shown in FIG. A control device 4 that controls a hydraulic device 3 that performs a gear shifting operation includes a throttle opening detector 5 that detects the throttle opening, a vehicle speed detector 6 that detects vehicle speed, and an acceleration judge that determines the acceleration of the vehicle. means 7, a shift pattern storage means 8 for normal driving that stores upshift and downshift shift patterns for normal driving, and a lock-up region at a gear position other than the highest speed gear than the shift pattern for normal driving. and zero throttle opening shift pattern storage means for storing a shift pattern for zero throttle opening in which the shift area is expanded, and the shift pattern storage means for normal driving 8 or the zero throttle opening shift pattern. Hydraulic system control means 10 that controls the hydraulic system 3 based on a shift pattern stored in storage means 9, operator operation determination means 12 that determines operator operation, and at least the throttle opening detector 5 and vehicle speed detection. Output signals are inputted from the device 6, the acceleration determining means 7, and the operator operation determining means 12, and based on these signals, the hydraulic system control means 10 is changed to the shift pattern stored in the shift pattern storage means 8 for normal running. A switching means 11 is provided for switching between a state in which the hydraulic device 3 is controlled according to the throttle opening degree and a state in which the hydraulic device 3 is controlled in accordance with the shift pattern stored in the shift pattern storage means 9 for zero throttle opening degree. is zero, and the acceleration of the vehicle is equal to or greater than a predetermined positive value preset according to the vehicle speed, and the operator operation determining means 12 detects the operator's operation, or when the acceleration is equal to or less than a predetermined negative value, the throttle is zero. The configuration allows switching to control using a shift pattern for opening.

(Function) The hydraulic system control means 10 controls the hydraulic system 3 based on the shift pattern stored in the shift pattern storage means 8 for normal running or the shift pattern storage means 9 for zero throttle opening. The switching means 11 is manually operated by at least a throttle opening detector 5 for detecting the opening of the throttle, a vehicle speed detector 6 for detecting the vehicle speed, an acceleration determining means 7 for determining the acceleration of the vehicle, and an operator operation determining means 12. Based on the signal, the hydraulic system control means 10 is controlled to control the hydraulic system 3 according to the shift pattern stored in the shift pattern storage means 8 for normal driving and the shift pattern stored in the zero throttle opening shift pattern storage means 9. The state is changed to a state in which the hydraulic device 3 is controlled according to the shift pattern. As a result, when the throttle opening is zero, the acceleration of the vehicle is greater than or equal to a positive predetermined value preset according to the vehicle speed, and the operator operation determination means 12 detects an operator operation, or when the When the value is less than the value, control can be switched to a shift pattern for zero throttle opening.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 2 to 8.

FIG. 2 is a block diagram of a control device for an automatic transmission according to an embodiment of the present invention, in which the microcomputer 14 is a CPU (
It includes a central processing unit (central processing unit) 15, a memory 16, a human power interface 17, and an output interface 18. The memory 16 is composed of, for example, a ROM (read-only memory) and a RAM (random access memory). Compatible. The CPU 5 corresponds to the acceleration determining means 7, hydraulic system controlling means 10, switching means 11, and operator operation determining means 12 shown in FIG. 1, and these functions are realized by software. The output of the CPU 15 is supplied to the hydraulic system 3 via an output interface 18. The CPU 15 receives various signals from a shift tower 20 equipped with a shift lever 19, a signal from an exhaust brake operation switch 21, a signal from a brake switch 23 that detects that the brake pedal 22 is depressed, and, for example, a gear. A signal from a vehicle speed detector 24 that detects the rotational speed of the output shaft of the transmission 2 and a signal from a stroke switch 26 that detects the stroke amount of the accelerator pedal 25 are input via the input interface 17. The vehicle speed detector 24 corresponds to the vehicle speed detector 6 in FIG. 1, and the stroke switch 26 corresponds to the throttle opening detector 5 in FIG. Although not shown, the CPU 15
Control signals are also supplied from the hydraulic device 3 to a solenoid of an exhaust brake device, etc., via an output ink face 18. Further, the operator operation determining means 12 in FIG. 1, which is realized by the CPU 15, is a function of detecting that the operator has depressed the brake pedal 22 based on a signal from the brake switch 23 in this embodiment.

The memory 16 stores shift patterns such as those shown in FIGS. 3 to 5, for example. That is, FIG. 3 shows the upshift timing of the shift pattern for normal driving in the drive range, and FIG. 4 shows the downshift timing of the shift pattern for normal driving in the drive range, and the horizontal axis represents the gear transmission 2. Output shaft rotation speed,
The vertical axis is the throttle opening. FIG. 5 shows the shift timing when the throttle opening is zero in the drive range, and the shift pattern labeled "brake shift" is for the zero throttle opening. This shift pattern for zero throttle opening is compared to the upshift and downshift of the shift pattern for normal driving.
The lock-up range and shift range at gear positions other than the highest gear are expanded. Note that the memory 16 also stores shift patterns in ranges other than the drive range.

Next, the operation will be explained. When the output of the stroke switch 26 indicates that the accelerator pedal 25 is depressed, that is, when the throttle opening is not zero, the microcomputer 14 uses the shift pattern for normal driving shown in FIGS. 3 and 4. The hydraulic system 3 is controlled based on. When the output of the stroke switch 26 indicates that the accelerator pedal 25 is not depressed, that is, when the throttle opening is zero, the microcomputer 14 calculates the acceleration of the vehicle from the output of the vehicle speed detector 24. , the relationship between vehicle speed and acceleration is investigated, and if these relationships are in areas B and C in FIG. 6 or in the area in FIG. 7, control based on the shift pattern for normal driving is continued. On the other hand, if the relationship between vehicle speed and acceleration is in region A of FIG.
4 continues control based on the shift pattern for normal driving until a braking signal is input from the brake switch 23 indicating that the brake pedal 22 is depressed; When inputted, the hydraulic system 3 is controlled based on the shift pattern for zero throttle opening, which is displayed as brake shift in FIG. On the other hand, when the relationship between vehicle speed and acceleration is in region E in FIG. 7, the microcomputer 14 displays the brake shift in FIG. 5 regardless of whether a braking signal is input from the brake switch 23. The hydraulic device 3 is controlled based on the shift pattern for zero throttle opening. In FIGS. 6 and 7, the horizontal axis represents the vehicle speed, and the vertical axis represents the acceleration of the vehicle.

In other words, when driving with zero throttle opening (so-called coasting state), there are cases where further deceleration by lock-up or downshifting is required than in that state: when the engine brake is not effective on a downhill slope and the acceleration is large; In most cases, there is an obstacle such as an oncoming vehicle or a curve in front of the driver, and in other cases, it is better to deal with it by slightly depressing the brake pedal 22 in terms of driving feeling.

If we consider that the vehicle is traveling downhill with no obstacles in front of it with zero throttle opening, if the vehicle speed is low, the operator does not need to decelerate even if the vehicle is slightly accelerating. However, when the vehicle speed is high, a deceleration operation is required even if the acceleration is slight. That is, in region A of FIG. 6, it is necessary to increase the effectiveness of the engine brake, in region B, it is sufficient to slightly press the brake pedal 22, and in region C, deceleration is not required. Therefore, at zero throttle opening, when the brake pedal 22 is depressed in region A, control is performed based on the shift pattern for zero throttle opening, and in regions B and C, control is performed based on the shift pattern for normal driving. I decided to do so.

On the other hand, if you are driving with zero throttle opening and an obstacle appears in front of you and you are decelerating, you may be able to decelerate gradually. It is better to leave it up to the operator's braking operation, etc., than to increase the amount. If rapid deceleration is required and the operator suddenly depresses the brake pedal 22, it is better to assist the deceleration by downshifting or the like. Considering this in relation to vehicle speed, if the vehicle speed is low, even if there is a rapid deceleration, the operator's braking operation is sufficient, and there is no need to assist in deceleration with a downshift. However, when the vehicle speed is high, it is necessary to assist the deceleration by downshifting or the like even if the deceleration is not so rapid. That is, in the region E of FIG. 7, it is necessary to increase the effectiveness of the engine brake, and in the region E, there is no need to increase the effectiveness of the engine brake.

Furthermore, in region E, it is better to switch to the shift pattern for zero throttle opening regardless of whether or not the brake pedal 22 is depressed. This is because the state in area E occurs when the operator performs a braking operation or when the operator takes his or her foot off the accelerator pedal 25 when suddenly climbing up the hill.In the latter case, when the operator depresses the accelerator pedal 25 again, This is because the driving feeling will be improved if the downshift is performed first when the driver takes his or her foot off the accelerator pedal 25, since the vehicle is often downshifted. In the former case, since a braking operation is performed, a braking signal is inevitably output from the brake switch 23, and the braking signal is added to the conditions for switching to the shift pattern for zero throttle opening. The result is the same. Therefore, at zero throttle opening, control is performed based on the shift pattern for zero throttle opening in region E regardless of whether or not the brake pedal 22 is depressed, and in region E, control is performed based on the shift pattern for normal driving. I tried to control it.

Next, the operation of the CPU 15 for realizing the above operation will be explained with reference to the flowchart shown in FIG.

First, in step a, it is determined whether the throttle opening is zero based on the signal from the stroke switch 26,
If it is zero, the process proceeds to step b, where it is determined whether the brake pedal 22 is depressed based on the signal from the brake switch 23, and if it is, the process proceeds to step C, where the current speed is determined based on the signal from the vehicle speed detector 24. It is determined whether the relationship between the vehicle speed and acceleration is in the area A, and if it is not in the area A, the process proceeds to step d, where it is determined whether the relationship is in the area E. If so, proceed to step e. In step e, the shift pattern for zero throttle opening is read out from the memory 16 to determine the shift position, and the process proceeds to step f.

In step f, a control signal is outputted to the hydraulic system 3 via the output interface 18, and as necessary, the control signal is caused to shift to the shift position determined in step e. Next, the process proceeds to step g, where it is determined whether or not there has been a change in the shift position of the shift lever 19. If there has been no change, the process proceeds to step h, where it is determined whether or not the throttle opening is zero based on the signal from the stroke switch 26. , if not zero, return to step a.

Note that if the throttle opening is not zero in step a, the process proceeds to step i, reads out the shift pattern for normal driving from the memory 16, determines the shift position, and proceeds to step j.
After proceeding to step a, the hydraulic system 3 is controlled and a gear change operation is performed as necessary, and then the process returns to step a. If the brake pedal 22 is not depressed in step b, the process proceeds to step d. Further, if the area is A in step C, the process proceeds to step e. Further, if the area is not E in step d, the process proceeds to step i. If the shift position of the shift lever 19 has been changed in step g, the process returns to step a. If the throttle opening is zero in step h, the process returns to step e.

(Another Embodiment) In the second embodiment described above, the stroke switch 26 that detects the stroke amount of the accelerator pedal 25 is used as the throttle opening detector 5, but the present invention is not limited to such a configuration. Alternatively, for example, a detector that directly detects the throttle valve opening may be used as the throttle opening detector 5.

Further, in the above embodiment, the vehicle speed detector 24 that detects the rotation speed of the output shaft of the gear transmission 2 is used as the vehicle speed detector 6, but the present invention is not limited to such a configuration, and the vehicle speed As the detector 6, for example, a detector that directly detects the rotation speed of the axle may be used.

Further, in the above embodiment, as the acceleration determining means 7, C
Using the PU 15, the CP is detected by the signal from the vehicle speed detector 24.
I configured UI 5 to calculate the vehicle acceleration, but
The present invention is not limited to such a configuration, and for example, an acceleration detector that directly detects the acceleration of the vehicle may be used as the acceleration determining means 7.

Further, in the above embodiment, the shift pattern is changed to the zero throttle opening shift pattern in the region A by the signal from the brake switch 23, but the present invention is not limited to such a structure. At A, the shift pattern may be configured to be switched to the zero throttle opening shift pattern in response to a signal from the exhaust brake operation switch 21. In this case, operator operation judgment means 1
2 detects a signal from the exhaust brake operation switch 21.

In the above embodiment, in region A, the shift pattern is switched to zero throttle opening by the signal from brake switch 23, and in region E, the shift pattern is switched to zero throttle opening regardless of the signal from brake switch 23. However, the present invention is not limited to such a configuration. For example, an operation switch operated by an operator may be provided, and when the operation switch is on, the brake switch 2 is switched in areas A and E.
It may be configured such that the shift pattern is switched to the zero throttle opening regardless of the signal from No. 3, and the shift pattern is not switched to the zero throttle opening even in areas A and H when the operation switch is off. In this case, the operator operation determining means 12 detects a signal from the operation switch.

(Effects of the Invention) As explained above, according to the present invention, the throttle opening is zero, the acceleration of the vehicle is equal to or greater than a positive predetermined value preset according to the vehicle speed, and the operator operation determination means is operated by the operator. The configuration allows control to be switched to the shift pattern for zero throttle opening when an operation is detected or when the throttle opening is below a predetermined negative value. Since it is possible to automatically downshift or lock up only when it is necessary to increase the speed, it is possible to improve the driving feeling.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of an automatic transmission using a control device of the present invention, FIG. 2 is a configuration diagram of an automatic transmission control device according to an embodiment of the present invention, and FIG. 3 is a shift diagram for normal driving. Fig. 4 is an explanatory diagram of the upshift pattern, Fig. 4 is an explanatory diagram of the downshift of the shift pattern for normal driving, Fig. 5 is an explanatory diagram of the shift pattern at zero throttle opening, Figs. 6 and 7 are respectively 6JiM that should be switched to a shift pattern for zero throttle opening in relation to vehicle speed and acceleration
FIG. 8 is a flowchart of the operation of the microcomputer 14, and FIG. 9 is an explanatory diagram of a shift pattern of a conventional automatic transmission control device at zero throttle opening. 1... Torque converter, 2... Gear transmission, 3
. . . Hydraulic system, 4. Control device, 5. Throttle opening detector, 6. Vehicle speed detector, 7. Acceleration judgment means, 8. Shift pattern memory for normal driving. Means, 9... Shift pattern storage means for zero throttle opening, 10... Hydraulic system control means, 11... Switching means Patent applicant: Daikin Seisakusho Co., Ltd. To 1 Figure 3 Time h* (rpm) Figure 5 Time *IK (rprn) Figure 6 Figure 7 To UC (rpm)

Claims (1)

[Claims] 1. A control device that controls the hydraulic system that operates the gear transmission installed after the torque converter with a lock-up mechanism, and includes a throttle opening detector that detects the throttle opening and a vehicle speed. A vehicle speed detector that
An acceleration determination means for determining the acceleration of the vehicle; a normal driving shift pattern storage means for storing upshift and downshift shift patterns for normal driving; and a shift pattern storage means for storing upshift and downshift shift patterns for normal driving; zero throttle opening shift pattern storage means for storing a shift pattern for zero throttle opening in which the lock-up region and shift region are widened at the gear position; and the normal driving shift pattern storage means or the zero throttle opening. hydraulic system control means for controlling the hydraulic system based on the shift pattern stored in the shift pattern storage means for opening degree; operator operation determination means for determining operator operation; and at least the throttle opening degree detector and vehicle speed. Output signals are input from the detector, the acceleration determining means, and the operator operation determining means, and based on these signals, the hydraulic system control means operates the hydraulic system according to the shift pattern stored in the shift pattern storage means for normal driving. and a state in which the hydraulic system is controlled according to a shift pattern stored in the shift pattern storage means for zero throttle opening, and a switching means is provided for switching between a state in which the hydraulic system is controlled according to a shift pattern stored in the shift pattern storage means for zero throttle opening, and When the acceleration is above a predetermined positive value preset according to the vehicle speed and the operator operation determination means detects the operator's operation, or when the acceleration is below a predetermined negative value, control is performed using a shift pattern for zero throttle opening. 1. A control device for an automatic transmission, characterized in that it is configured to be able to switch to.