JPS61248943A - Electronic control transmission for car - Google Patents

Abstract

PURPOSE:To enable arbitrary selection of automatic and manual gear shifting, according to the method wherein, in a title transmission, a fixed gear shifting lever position, selected by a lever for gear shifting control, is arranged in an H-pattern, an automatic gear shifting range position is set in a range position next to a maximum range position. CONSTITUTION:A gear shifting range position, selected by a shift lever 11 for gear shifting control, has a parking position P, fixed gear shifting range positions 1-4 of first-fourth speed, respectively, an automatic gear shifting range position D, a forward range position R, and a gear shifting neutral position N. The gear shifting range positions are arranged in an H-pattern such that the parking position P is disposed in a position below a lowermost speed position, the fixed gear shifting positions are aligned, in order, from the low speed side to the high speed side, and the automatic gear shifting range position D is disposed in a position above the highmost speed position. Gear shifting control is effected along the pattern of each of the gear shifting range positions arranged in the H-pattern.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electronically controlled transmission for an automobile, which is equipped with a means for automatically selecting a shift range according to vehicle speed and accelerator opening by electronic control. .

(Prior Art) In the above-mentioned electronically controlled transmission for automobiles, basically, the gear shift range of the transmission is adjusted so that the necessary torque output can be obtained depending on the vehicle speed and the extent to which the driver depresses the accelerator. It is configured to optimally control the position. Some automatic transmissions of this type combine a torque converter and a planetary gear mechanism, but they have the following disadvantages.

In other words, from the perspective of fuel efficiency, it is better to have a lower shift point in the gear range, but in fully automatic gear shifting, from the perspective of durability, it is necessary to prevent the gear shifting actuator from operating too frequently. The range shift point cannot be set too low.

This type of electronically controlled transmission is basically configured so that a shift range is automatically selected based on the vehicle speed (V) and the accelerator opening (F), as shown in FIG. 5, for example. In addition, since there is insufficient torque in the engine's idle rotation range, it is necessary to set the minimum operating speed range of the engine speed (Ne) at each shift range position to a high value, which is similar to the manual shift type shift operation described above. In other words, it is not possible to drive at a speed below the idle speed (No.).

In addition, in normal manual shift-type gear shifting operations, the effectiveness of the engine brake is controlled solely by accelerator operation in response to road gradients, etc., but in automatic gear shifting, changes in accelerator operation are used as acceleration/deceleration intentions. Since the system is designed to detect this, there are cases where the gear shift operation is performed against the user's will. Therefore, in automatic gear shifting, in order to apply engine braking without performing a gear shifting operation, the degree of freedom in the relationship between the amount of engine braking and the vehicle speed range must be reduced.

Furthermore, when shifting when the accelerator pedal is depressed, it is necessary to change the engine speed due to the relationship between the gear ratios of each gear range, and in order to increase torque, it is necessary to downshift the gear range. Therefore, if the clutch of the transmission is engaged before the engine speed has risen sufficiently, the engine brake will be applied against the intention of acceleration, and as shown in Figure 6, the engine speed (Ne) will be lower in the lower gear range. (for example, 2nd gear), it is not possible to actually accelerate until the vehicle reaches a predetermined rotational speed that is the same as the vehicle speed (ν) in a high shift range (for example, 3rd gear). There will be a certain amount of delay before the vehicle actually accelerates.

On the other hand, if you take your foot off the accelerator in an attempt to decelerate, the energy that lowers the engine speed acts as a force that accelerates the vehicle, causing the inconvenience that the vehicle accelerates in the opposite direction to your intention to decelerate.

Therefore, if the gear is shifted only by operating the accelerator, the rotational inertia of the engine will act on the vehicle drive system as a force in the opposite direction to the driver's will, and automatic gear shifting alone will not be able to perform a natural gear shift operation. In delicate situations, a regular manual shift type fixed speed range is required.

In other words, with only fully automatic gear shifting, there is a limit to the improvement in fuel efficiency, even if the control form of gear shifting operations is devised.

Therefore, in order to improve the above-mentioned disadvantages, in recent years, a method has been proposed in which the gear range of a transmission equipped with a stepped transmission mechanism that reduces power transmission loss due to a combination of ordinary gears is automatically switched by electronic control. .

In addition, it is difficult to optimally respond to all vehicle driving conditions with fully automatic gear shifting, and in order to respond to driver preferences, it is now possible to shift gears manually in relatively low-speed gear ranges. be configured to have a selectable automatic shift range range, or
It has also been proposed to provide a separate means for switching between manual and gear shifting operations.

For example, a device has been proposed in which the gear can be changed by switching between a manual mode in which the gear is shifted manually and an automatic mode in which the gear is shifted automatically using a switch or the like (see Japanese Patent Laid-Open No. 59-37359). .

By the way, when the manual mode is set with this configuration, as shown in Fig. 4, the shift operation at each shift range position is similar to the shift operation of a normal manual shift type transmission that has a fixed shift range of 1st to 4th speed. , the vehicle speed (V) and the engine rotation speed (Ne) have a proportional relationship. In addition, since the shift range can be selected regardless of vehicle speed (V) or accelerator opening, it is possible to drive in the high speed shift range position even at low vehicle speeds, and it is also possible to drive at engine idle speed (No.) or lower. .

Alternatively, a means is being considered in which the current shift range position selected by automatic shift can be sequentially changed to a shift range position adjacent to the current shift range position in the vertical direction by operating a switch. (Refer to Japanese Unexamined Patent Publication No. 103056/1983).

(Problem to be solved by the invention) However, in the conventional configuration described above, automatic/
Since the manual switching operation is performed by an operation means that is provided separately from the lever for switching the gear range position, it is actually difficult to perform the automatic/manual switching operation while driving. However, the operability was not good.

Similarly, it is difficult to switch the automatically selected shift range position by operating a separately provided switch or the like during driving, and the operability is poor.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to make it possible to select and use both automatic shifting and manual shifting in all shift ranges, and to improve the operability of selecting the shift range position. It's about improving.

(Means for Solving the Problems) The electronically controlled transmission for automobiles according to the present invention is characterized by a fixed shift range position in which all of the plurality of automatically selected shift ranges are individually selected by manual operation; an automatic transmission range position for automatically selecting the plurality of transmission ranges, and one shift lever for transmission operation for selecting each of the fixed transmission range positions and the automatic transmission range position, and
The fixed shift range positions selected by the shift lever for shift operation are arranged in an H shape so as to change sequentially from the low speed side to the high speed side, and the automatic shift range position is set to the range position next to the highest speed range position. The functions and effects are as follows.

(Function) In other words, both the fixed shift range position where manual shift operation is possible over the entire shift range and the range position where automatic shift operation is performed are changed so that the shift range position sequentially changes from the low speed side to the high speed side. By arranging them in an H-shape, it is possible to shift gears with the same operational feel as a normal manual shift type transmission. By providing an automatic shift range position next to the highest speed range position of the fixed shift range, it is possible to switch between manual and automatic shift range positions with a single shift lever.
If the high-speed gear range position is selected in the automatic gear range position and the gear range position is switched to the manual side while driving, the gear may be accidentally shifted suddenly to the low-speed fixed gear range position several gears lower. This prevents the engine speed from increasing abnormally or from applying the engine brake unnecessarily.

(Effects of the Invention) Therefore, similarly to a manual shift type transmission, any shift range position out of all the shift ranges provided in the transmission can be selected as a fixed shift range using the shift lever for shift operation. Switching to automatic transmission can also be performed using the same shift lever, greatly improving operability. Moreover, the arrangement of the fixed shift range positions is sequentially shifted from the low speed side to the high speed side, and the automatic shift range position is provided at the range position next to the highest speed range position of the fixed shift range. It is possible to prevent such inconvenience as the engine speed suddenly increasing to a lower fixed gear range several gears lower than the gear range, resulting in an abnormal increase in engine speed. By the way, on the other hand, when a gear shift operation is suddenly performed from the low-speed side fixed gear range position to the automatic gear shift range position, the gear change range switching from the automatic gear range is as clear from the shift map shown in FIG. Since this is generally done at a higher engine speed than when shifting manually, there is no need to shift further to the lower speed range, and no unreasonable load is applied to the engine, so this is not a problem.

Furthermore, since fixed shift range positions for manual operation are provided over the entire shift range for automatic shift, it is possible to drive with low fuel consumption.

For example, if the transmission according to the present invention is used in a vehicle for transporting luggage such as a trunk, the transmission will be automatically shifted when the luggage is loaded, and then switched to a fixed shift range position for manual operation while driving. It can reliably prevent the engine from stalling,
Moreover, it has the effect of enabling stable driving with good fuel efficiency. Conversely, when the vehicle is loaded with cargo, the vehicle shifts manually, and when the load is relatively light, such as when the vehicle is not loaded, the vehicle shifts automatically, thereby reducing fuel consumption and eliminating the hassle of shifting gears. A free Esithtribe is now possible.

In addition, since the shift range position can be fixed over the entire shift range, acceleration and deceleration operations can be performed simply by operating the accelerator at any shift range position during steady driving, and the acceleration response to accelerator operation is good. Can be used in Similarly, engine braking can be applied at any shift range position while the shift range position is fixed to the driver's preference.

(Example) Embodiments of the present invention will be described below based on the drawings.

Figure 2 is a control block diagram of an electronically controlled automobile transmission that automatically switches gear ranges using electronic control. Drive wheels (3) via a transmission (2) with a variable speed clutch mechanism (1) with selectable positions
It is configured to communicate.

The clutch mechanism (1) is operated by pressure oil from a hydraulic pump (5) sent through a switching valve (4), and is controlled by a control signal from a controller (6). The switching position of the switching valve (4) is controlled to transmit the output of the engine (E) to the driving wheels (3) at a predetermined reduction ratio.

The controller (6) measures the rotational speed of the output shaft of the transmission (2) to detect whether or not the accelerator (8) is operated by a vehicle speed sensor (7) configured to detect vehicle speed (V). The accelerator opening degree (detected by the accelerator switch (9) and the potentiometer (10) whose output voltage changes in conjunction with the depression of the accelerator (8))
F) and a shift select switch (12) that detects the operating position of the shift lever (11) for selecting a shift range position, and switches the switching valve (4). It is configured to control the position.

As shown in FIG. 1, the shift range positions selected by the shift lever (11) for shift operation include a parking position (P) used when parking the vehicle, fixed shift range positions of 1st to 4th speeds ( ■～■), an automatic shift range position (D) where the gears are automatically shifted over the entire shift range, a reverse range position (R), and an intermediate position between the automatic shift range position (D) and the reverse range position (R). The parking position (P) is located below the lowest speed position, and fixed gear range positions are sequentially arranged from the low speed side to the high speed side. The respective shift range positions are arranged in an H shape so that the automatic shift range position (D) is located at the upper position. Shift operations are then performed in accordance with this H-shaped pattern of shift range positions.

As shown in the flow chart of FIG. 3, the controller (6) controls the shift lever (11) for speed change operation.
is operated in each of the fixed shift range positions (■ to ■) of 1st to 4th speeds and the reverse range position (R), the vehicle speed (V) detected by the vehicle speed sensor (7) and the potentiometer (10) Regardless of the accelerator opening degree (F) detected by
The switching position of the switching valve (4) is controlled so that the shifting position of the transmission (2) is fixed at the selected shifting range position.

On the other hand, when the shift lever (11) is operated to the automatic shift range position (D), the vehicle speed sensor (7
) and the accelerator opening (F) detected by the potentiometer (10), the shift range position of the transmission (2) is determined to be optimal for the running load according to the shift map shown in Fig. 5. The switching position of the switching valve (4) is controlled so that the switching valve (4) is in the position shown in FIG.

[Brief explanation of drawings]

The drawings show an embodiment of an electronically controlled transmission for an automobile according to the present invention, in which FIG. 1 is a diagram showing an arrangement of shift ranges of a shift lever, FIG. 2 is a block diagram of a control system, and FIG.
Fig. 4 is a flowchart showing the operation of the controller, Fig. 4 is a drawing showing the relationship between vehicle speed and engine speed in each fixed shift range, Fig. 5 is a shift map for determining the shift range during automatic shifting, and Fig. 6 is a diagram showing the relationship between vehicle speed and engine speed in each fixed shift range. The figure is an explanatory diagram of changes in engine speed during gear shifting.

Claims (1)

[Claims] 1. An electronically controlled transmission for an automobile, which is equipped with a means for automatically selecting a shift range according to vehicle speed and accelerator opening by electronic control, wherein all of the plurality of automatically selected shift ranges are selected. Fixed shift range positions that are individually selected by manual operation and automatic shift range positions that automatically select the plurality of shift ranges are provided, and one shift operation for selecting each fixed shift range position and automatic shift range position. A lever is provided, and the fixed speed range positions selected by the speed change operation shift lever are arranged in an H shape so as to sequentially change from a low speed side to a high speed side, and the position is set to the next range position after the highest speed range position. , an electronically controlled transmission for an automobile, which is provided with the automatic shift range position.