JPH068906Y2 - Shift control device for mechanical automatic transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a shift control device for a mechanical automatic transmission that automatically selects and controls an appropriate shift gear position according to vehicle conditions.

[Prior Art] Conventionally, in a shift control device of this type, a shift operation is performed only when an accelerator pedal is depressed. That is, as shown in FIG. 3, when the accelerator pedal depression position is in the idle rotation state of the engine, in other words, when the engine is in the idle stroke state, the gear shifting operation is not performed, and the accelerator pedal is depressed to stop the idle stroke. Then, a shift map that defines an appropriate gear position is looked up, and it is compared whether or not the current gear position is the proper gear position. If the gear position is not the proper gear position, the shift operation is performed.

For this reason, as if you noticed that the front signal changed from a green signal to a red signal while traveling, release the accelerator pedal and use the engine brake when traveling for a while. Continue running in gear position. And the vehicle speed is constant speed (eg 15km / h)
When it goes down, the clutch is disengaged, the gear position is set to the neutral position, and the accelerator pedal is depressed again. When the vehicle speed further decreases to almost stop speed, the gear position is controlled to switch to the start gear.

[Problems to be Solved by the Invention] In the above conventional shift control device, after continuing to return the accelerator pedal and before reaching a constant speed, for example, when the signal changes from a red signal to a green signal to accelerate, The gear change control device has a problem that it takes time to shift gears and the start is delayed because the gear change operation is performed by selecting an appropriate gear position from the neutral gear position state only after the accelerator pedal is depressed.

An object of the present invention is to provide a shift control device for a mechanical automatic transmission, which can shorten the shift time when re-accelerating after decelerating to a predetermined vehicle speed by returning the accelerator pedal and improving the acceleration performance. Especially.

[Means for Solving the Problems] In order to achieve the above object, a shift control device for a mechanical automatic transmission according to the present invention includes a shift actuator that changes a gear position of the mechanical automatic transmission, and an injection pump injection. A fuel adjusting actuator for adjusting the amount, a clutch actuator for connecting and disconnecting the clutch, a selector lever sensor for detecting a shift operation position of a selector lever for performing a shift operation of the transmission, and a pedal stroke of an accelerator pedal are detected. An accelerator sensor, a rack position sensor for the injection pump, a clutch sensor for detecting a stroke of the clutch actuator, an engine rotation sensor, a gear position sensor for the transmission, a vehicle speed sensor, and each of the plurality of sensors. Based on the output, the actuators are controlled so that the operating conditions are appropriate. And a controller.

A characteristic configuration of the present invention includes a brake sensor that detects an operating state of a brake pedal, the vehicle speed sensor detects a vehicle speed lower than a predetermined vehicle speed in a state where the accelerator sensor detects an idle stroke, and the brake sensor. When the controller detects the release of the brake, the controller controls the clutch actuator and the shift actuator so as to shift the current shift gear position to a predetermined low speed gear position.

[Operation] When the accelerator pedal is released during running and the vehicle speed drops to a predetermined value, the low-speed gear position is selected according to the vehicle speed at that time unless the brake pedal is depressed, so the gear shift time when accelerating again Shortened.

[Embodiment] Next, an embodiment of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, the shift control device for a mechanical automatic transmission according to this embodiment includes a controller 1 including a microcomputer. Outputs of a selector lever sensor 2, an accelerator sensor 3, a rack position sensor 4, a clutch sensor 5, a rotation sensor 6, a gear position sensor 7, a vehicle speed sensor 8 and a brake sensor 9 are connected to the controller 1.

The selector lever sensor 2 is a reverse position of the selector lever 11 for performing a shift operation of the mechanical automatic transmission 10,
It detects gear shift operation positions such as neutral position, drive position, and hold position. The transmission 10 moves forward 7 in this example.
One step, one step backward. The accelerator sensor 3 detects the pedal stroke of the accelerator pedal 12. The rack position sensor 4 detects a control rack position of the injection pump 13, and the clutch sensor 5 detects a stroke of a clutch actuator described later. The rotation sensor 6 is the engine 1
5, the gear position sensor 7 detects the rotation speed of the transmission 5,
The gear position of is detected. The brake sensor 9 detects the pedal stroke of the brake pedal 20.

The load lever 16 of the injection pump 13 is provided with a fuel adjusting actuator 17 including a linear solenoid that moves the position of the load lever 16. The control output of the controller 1 is connected to the actuator 17. Clutch 1
4 is provided with a clutch actuator 18 which is an air cylinder that connects and disconnects the clutch. The transmission 10 is provided with a shift actuator 19 including an air cylinder that shifts and selects a shift gear.

Air pipes 21 are provided for the actuators 18 and 19, respectively.
An air tank 23 is connected via 22 and 22. An exhaust pipe 24 is connected to the actuator 18. Air supply solenoid valves 25 to 28 are provided in the air pipe 21, and air supply and exhaust solenoid valves 31 to 28 are provided in the air pipe 22, respectively.
34 is provided, and exhaust air solenoid valves 29 and 30 are provided in the air pipe 24, respectively. These solenoid valves 25-3
The control output of the controller 1 described above is connected to 4. The air supply solenoid valves 25 to 28 are four types of solenoid valves having different orifice diameters. The solenoid valve 25 has a maximum orifice diameter and the solenoid valve 28 has a minimum orifice diameter.

The controller 1 has a built-in memory that stores operating conditions such as an appropriate shift gear position and fuel injection amount for achieving economical traveling and smooth traveling of the vehicle.
When the output signals of the sensors 2 to 9 are input, the actuator 17 is controlled so that the operating conditions are appropriate stored in the memory based on a preset program.
-19 are controlled.

The characteristic configuration of the present invention is that the accelerator sensor 3,
The controller 1 operates the clutch actuator 18 and the speed change actuator 19 in response to the detection signals of the vehicle speed sensor 8 and the brake sensor 9 to prepare for acceleration early.

The characteristic operation of the shift control device thus configured will be described with reference to the flowchart of FIG.

First, when the accelerator sensor 3 detects an idle stroke, the vehicle speed sensor 8 detects the first predetermined vehicle speed, for example, 25 km / h.
When detecting a vehicle speed exceeding 0, it waits for the accelerator pedal 12 to be depressed next. The vehicle speed is 25km / h or less,
If the vehicle speed exceeds the second predetermined vehicle speed, for example, 10 km / h, it is compared whether or not the current gear position detected by the gear position sensor 7 is the first low speed gear position, for example, the third speed or lower. If it is at the fourth speed or higher, the clutch actuator 18 disengages the clutch 14 and the gear shift actuator 19 keeps the gear position neutral. If the brake sensor 9 detects the release of the brake in this state, the gear position is switched to the third speed and the next accelerator pedal 12 is waited for. If the brake sensor 9 does not detect the release of the brake, it is compared again whether the current vehicle speed has dropped to 10 km / h or less.

The accelerator pedal 12 was not depressed and the vehicle speed decreased to 10 km / h.
When it becomes below, it is compared whether or not the current gear position detected by the gear position sensor 7 is equal to or lower than the second low speed gear position which is the second low speed gear position. If it is the third speed or higher, the clutch 14 is disengaged and the gear position is set to neutral. If the brake 20 is not depressed in this state, the gear position is switched to the second gear, and if the vehicle speed is not the stop speed, the next accelerator pedal 12 is awaited. When the vehicle speed reaches the stop speed, the gear position is switched to the start gear.

If the pedal 12 is depressed while waiting for the accelerator pedal 12 to be depressed during deceleration as described above, the gear position has already been switched to the third speed or the second speed according to the vehicle speed at that time. Accelerate quickly.

In the above description, the prescribed vehicle speed is 25 km / h and 10 km / h.
However, these numerical values are examples, and the predetermined vehicle speed of the present invention is not limited to these.

In addition, as a predetermined low speed gear position, there are two of the third speed and the second speed.
Although one gear position is shown, only one of them may be used.

Further, the example of the brake sensor that detects the pedal stroke of the brake pedal is shown, but a brake sensor that detects the fluid pressure of the brake may be used.

[Effect of the Invention] As described above, according to the present invention, when the accelerator pedal is released during traveling and the vehicle speed drops to a predetermined vehicle speed, if the brake pedal is not depressed, the low speed gear position is set according to the vehicle speed at that time. Is selected, and the vehicle is ready to accelerate, so that the shift time for accelerating again can be shortened and the acceleration performance can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram of a shift control device for a mechanical automatic transmission according to an embodiment of the present invention. FIG. 2 is a flowchart showing the operation of the shift control device. FIG. 3 is a flowchart showing the operation of the conventional shift control device. 1: Controller, 2: Selector lever sensor, 3: Accelerator sensor, 4: Rack position sensor, 5: Clutch sensor, 6: Rotation sensor, 7: Gear position sensor, 8: Vehicle speed sensor, 9: Brake sensor, 10: Machine Automatic transmission, 11: selector lever, 12: accelerator pedal, 1
3: injection pump, 14: clutch, 15: engine, 1
7: actuator for fuel adjustment, 18: clutch actuator, 19: speed change actuator, 20: brake pedal.

Claims (1)

[Scope of utility model registration request] 1. A shift actuator for changing a gear position of a mechanical automatic transmission, a fuel adjusting actuator for adjusting an injection amount of an injection pump, a clutch actuator for connecting and disconnecting a clutch, and a shift operation of the transmission. Selector lever sensor for detecting the shift operation position of the selector lever, an accelerator sensor for detecting the pedal stroke of the accelerator pedal, a rack position sensor for the injection pump, a clutch sensor for detecting the stroke of the clutch actuator, and an engine A mechanical automatic system including a rotation sensor, a gear position sensor of the transmission, a vehicle speed sensor, and a controller that controls the plurality of actuators based on the outputs of the plurality of sensors so as to obtain appropriate operating conditions. In the shift control device of the transmission, the brake pedal When the vehicle speed sensor detects a vehicle speed lower than a predetermined vehicle speed in a state where the accelerator sensor detects an idle stroke and the brake sensor detects release of the brake, the controller Is a shift control device for a mechanical automatic transmission, wherein the clutch actuator and the shift actuator are controlled so as to shift the current shift gear position to a predetermined low speed gear position.