JPH0512508Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is equipped with a control unit, and when the auto range designation button is turned on and a specific gear is specified with the selector, the shift map automatically starts depending on the vehicle speed and accelerator opening. This invention relates to improvements in automatic transmission devices for vehicles that perform range control.

[Prior Art] As an automatic system that achieves both easy driving and fuel economy, there is known a mechanical automatic system in which sensors such as engine revolution speed detection means, i.e., engine revolution sensor, vehicle speed detection means, i.e., vehicle speed sensor, and actuators for operating the clutch and transmission are added to the conventional mechanical clutch and transmission, and these are electronically controlled by a control unit. Furthermore, there is also known a semi-automatic system in which only the clutch operation at the time of starting is performed manually, and all other gear shifting operations are performed automatically (for example, see the Japanese Utility Model Application No. 1984-2001 filed by the present applicant).
No. 70610).

This semi-automatic system has an auto range that automatically selects the shift gear based on vehicle speed and accelerator opening, and a manual range that allows the driver to specify the shift gear using the selector. There are several techniques.

A technique has been proposed in which an auto range designation position is provided at a position independent of the normal shift stage, and an auto range designation button (hereinafter referred to as auto button) is not provided. In response to this, a technique has been proposed in which an auto button is provided, and when the auto button is turned on, a specific speed (for example, 5th gear) is designated with a selector, thereby switching to auto range. This technique has the advantage that it is possible to switch between auto range and manual range at the appropriate time without adding the auto range position to the selector.

By the way, in this technology, auto-range control is performed using vehicle speed and accelerator opening as parameters, and vehicle weight is not a parameter. Therefore, for vehicles with a large difference in vehicle weight between loaded and empty, even if you want to maintain a specific gear to obtain traction when climbing a hill with a loaded vehicle, depending on the vehicle speed, the gear next to the specific gear may change. The problem is that the vehicle is shifted up, resulting in a lack of traction and reduced driving performance.

In general, various types of automatic transmission devices for vehicles are known. For example, Japanese Patent Application Laid-Open No. 147949/1983 discloses a technique having a speed change pattern related to engine braking. Also, JP-A-60-11768
The publication discloses a technique for selecting the highest gear as the optimum gear when changing from a low speed range to a high speed range. Furthermore, JP-A-55-
Japanese Patent Publication No. 76244 discloses a technique for setting an optimum shift diagram for each gear of a manual transmission in a device that switches between high and low gears separately from the manual transmission.

However, none of these known techniques can improve the running performance when climbing a hill depending on the weight of the vehicle.

[Problems to be Solved] Therefore, an object of the present invention is to provide an automatic transmission device for a vehicle that can improve running performance when climbing a slope, whether the vehicle is loaded or empty.

[Means for Solving the Problems] According to the present invention, a control unit is provided, and when an auto range designation button is turned on and a specific gear is designated with a selector, auto range control is performed using a shift map according to vehicle speed and accelerator opening. In a vehicle automatic transmission, when the auto range designation button is turned on in the control unit and a selector gear other than neutral, reverse, or parking is specified using the selector, auto range control is performed to set the specified selector gear as the highest gear. A control circuit is provided to perform automatic range control, and the control circuit sets a desired target gear from a shift-up map according to vehicle speed and accelerator opening during auto range control, and determines whether the current gear is smaller than the target gear. If the current gear is smaller than the target gear, it is determined whether the target gear is greater than the selector gear where the auto button was turned on, and if it is larger, it shifts up to that selector gear, and if it is smaller, it shifts up to the target gear. It has the ability to shift up to

[Description of Effects] Therefore, when climbing a slope, the driver specifies the selector stage and turns on the auto range designation button based on his/her own driving sense. Then, the control circuit uses a shift-up map to compare the target gear and the current gear, sets the specified selector gear as the highest gear, and shifts up relative to the current gear, so the optimum selector gear is selected according to the loaded weight. Even if they are different, auto-range control is performed at the optimal stage. Therefore, there is no lack of traction power or insufficient vehicle speed when climbing hills.

Therefore, according to the present invention, by incorporating the element of manual control that specifies the selector stage into the auto range control, it is possible to improve the driving performance when climbing hills, and to make driving relatively easy for the driver. can do.

[Examples] Examples of the present invention will be described below with reference to the drawings.

FIG. 1 shows the overall configuration of an embodiment of the present invention, and FIG. 2 shows a control block diagram. In the figure, a non-synchronized transmission 30 is attached to an engine 10 via a mechanical clutch 20, and its output shaft is connected to a rear axle (not shown) via a propeller shaft 31.

The engine 10 is provided with an accelerator opening sensor 12 for detecting the position of the fuel injection pump 11.

The clutch 20 is provided with a clutch position sensor 21 that detects whether the clutch is engaged or not, and a clutch actuator 22 that engages or disengages the clutch.

The transmission 30 includes a countershaft rotation sensor 32 that detects the rotational speed of the main gear, and a vehicle speed sensor 3 that detects the rotational speed of the main shaft.
3, a shift position sensor 34 for detecting the shift position of the transmission, and a shift change actuator 35 for shifting the transmission.

On the other hand, a selector 13 provided in a driver's cab (not shown) uses a selector lever 13a to reverse R, 1
Six ranges from speed to 6th speed and neutral N can be specified, and there is a switch inside that corresponds to each range. Reference numeral 14 denotes an auto button for specifying auto range, and when this button 14 is turned on, the selector 13 is used to specify a specific gear (for example, 5th speed) to switch to auto range. 15 is a shift position display lamp, 16
1 is an accelerator pedal, and 17 is an accelerator switching device. And these sensor devices 12, 13, 1
4, 15, 17, 21, 22, 32, 33, 3
4 and 35 are connected to a control unit 40.

The control unit 40 uses a shift up map or a shift down map based on detection signals from the vehicle speed sensor 33, accelerator opening sensor 12, and shift position sensor 34 to determine whether or not to change the shift. Button 1
4 is turned on, and when the selector 13 specifies a specific gear other than neutral, reverse, or parking, the shift change control circuit 41 performs auto-range control to set that specific gear as the highest gear; The countershaft rotation sensor 32 and the vehicle speed sensor 33 are output to the circuit 41.
A synchro determination circuit 42 determines whether the rotational speeds of the main gear and the main shaft are synchronized based on a detection signal from the clutch actuator. 22, a clutch intermittent control circuit 43, and an accelerator control switching device 1.
An engine control circuit 44 outputs an accelerator switching command to switch the accelerator operation from manual to automatic, and a transmission control circuit 45 controls the shift change actuator based on a detection signal from the shift position sensor 34. .

Next, the operation will be explained mainly with reference to the drawings from FIG. 3 onwards.

FIG. 3 shows the basic control flow of the semi-automatic system.

First, the shift change control circuit 41 determines whether or not it is neutral based on the signal from the selector 13 (step S1), and if YES, a control signal is output from the transmission control circuit 45 to the shift change actuator 35 to change the gear. The control is ended by setting the machine 30 to neutral (step S2). step
If NO in S1, it is determined whether the selector 13 is in reverse (step S3), and if YES, the transmission 30 is set in reverse (step S4). If NO in step S3, press auto button 1
Based on the signal from 4, it is determined whether auto range is specified (step S5). If YES, the driver determines the target shift gear corresponding to the vehicle speed and accelerator opening based on the signals from the vehicle speed sensor 33 and accelerator opening sensor 12 (step S6); if NO, the driver selects the target shift gear using the selector 13. Specify (step)
S7), both move to step S8. In step S8, the shift change control circuit 41 determines whether or not a shift is necessary (step S8). If NO, the control ends; if YES, it determines whether or not to shift up (step S9). Then perform shift-up control and end the control (step
S10), if NO, performs downshift control and ends the control (step S11).

FIG. 4 shows the control flow of the present invention.

Now, when the selector 13 specifies the selector gear 4th gear and the auto range 14 is turned on while the vehicle is running, the control circuit 41 starts the auto range control of the present invention with the 4th gear being the highest gear. That is,
First, a desired target gear is set from the shift-up map according to the vehicle speed and accelerator opening (step
S21). Next, it is determined whether the current shift gear is smaller than the target gear based on the detection signal from the shift position sensor 34 (step S22). If YES, for example, if the current shift gear is 2nd gear and the target gear is 3rd gear or higher, check whether the target gear is larger than the selector gear (4th gear in this example) when the auto button 14 was turned on. If the result is YES (step S23), for example, if the target gear is 5th gear, the shift change actuator 35 is sent from the shift control circuit 45.
Outputs a control signal to shift up to the selector stage, that is, 4th gear (step S24), and completes the control.
If NO, if the target gear is equal to or smaller than the selector gear (4th gear), for example, if the target gear is 4th gear or less, the gear is shifted up to the target gear, that is, 4th gear or lower (step S25), and the control ends. . Therefore, the gear will not be shifted up beyond the selector stage (4th gear) when the auto button 14 is turned on.
When climbing uphill, press auto button 1 on the selector stage you want to hold.
4 can be turned on to prevent lack of traction force.

If NO in step S22, that is, if the current shift gear is larger than the target gear on the shift up map, the shift change control circuit 41 switches to the downshift map and selects a target gear more preferable than the downshift map according to the vehicle speed and accelerator opening. (step S26). Next, it is determined whether the target gear is smaller than the current shift gear (step S27). YES
For example, the target gear is 2nd gear and the current shift gear is 3rd gear.
In the case of NO, a control signal is output from the transmission control circuit 45 to the shift change actuator 35 to downshift to the target gear, that is, 2nd gear (step S28), and the control ends; if NO, the target gear is shifted down. If is equal to or larger than the current shift speed, for example, if the target speed is 3rd speed or higher, the control ends immediately. Therefore, at the time of downshifting, downshifting control according to the prior art is performed, and it is possible to prevent insufficient engine braking force when descending a slope.

[Effects of the invention] As described above, according to the present invention, the following excellent effects are achieved.

(i) When climbing a slope, if you specify a selector gear and turn on the auto range designation button, the gear will not be shifted up beyond the specified selector gear, thereby preventing a lack of traction.

(ii) If the driver specifies a selector gear according to the loaded weight, that selector gear will be shifted up when climbing a slope, making driving easier.

(iii) By incorporating elements of manual control into auto range control, it is possible to perform driving that matches the driving sensation, improving driving performance.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention;
FIG. 2 is a control block diagram, FIG. 3 is a basic control flowchart of the semi-automatic system, and FIG. 4 is a control flowchart of the present invention. 12... Accelerator opening sensor, 13... Selector, 15... Auto button, 33... Vehicle speed sensor, 40... Control unit, 41... Shift change control circuit.

Claims (1)

[Scope of utility model registration request] In automatic transmission systems for vehicles that are equipped with a control unit and perform auto-range control using a shift map according to vehicle speed and accelerator opening when a specific gear is specified with the selector when the auto-range specification button is turned on, the control unit specifies auto-range. If a selector stage other than neutral, reverse, or parking is specified with the selector when the button is turned on, a control circuit is provided to perform auto-range control with the designated selector stage as the highest stage. The circuit sets a desired target gear from the shift up map according to the vehicle speed and accelerator opening during auto range control, judges whether the current gear is smaller than the target gear, and if the current gear is smaller than the target gear, For vehicles, characterized by having a function of determining whether or not the target gear is larger than the selector gear at which the auto button is turned on, and if it is larger, shifts up to the selector gear, and if smaller, shifts up to the target gear. Automatic transmission.