JP2688404B2 - Vehicle speed change control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle speed change control device.

[0002]

2. Description of the Related Art In recent years, as a shift control device for a vehicle, the range position of shift command means (shift lever device) for generating a gear shift request to a transmission in response to a manual operation in a driver's cab is shifted up, down, hold or reverse. , Simplifies to five neutral positions, and controls the gear shift of the transmission based on the generation request (shift up request, shift down request, shift position hold request, reverse gear set request, neutral set request). There are known ones (see Japanese Patent Laid-Open No. 5-210713).

FIG. 4 is a flow chart for explaining the gear shift control of such a shift control device. When the clutch is disengaged when the vehicle is stopped (when the vehicle speed is below the reference value for stopping the vehicle), the range position of the shift lever is changed. Accordingly, the reverse gear is set to the reverse position and the neutral position is set to the neutral position (steps 1 to 6). Also, when the lever is operated (shift up operation) to the shift up position, the high speed start stage (UP side start stage) is performed when the transmission is in neutral or reverse.
If the transmission is not in neutral or reverse, the gear set to is shifted to the gear position corresponding to the current gear + n (normally n = 1) (step 7).
~ Step 10).

When the clutch is disengaged while the vehicle is running (when the vehicle speed exceeds the reference value for stopping the vehicle), the neutral position is set at the neutral position according to the range position of the shift lever, but the reverse position is set at the reverse position. No gear setting is performed (step 11 to step 14).
Also, when the lever is operated (shift up operation) to the shift up position, the gear change is not performed when the transmission is reverse, and the gear set to the shift stage selected from the shift map is set when the transmission is in neutral. When it is not in neutral or reverse, a shift change to the current gear + n (normally n = 1) is performed (step 15 to step 1).
9).

Regarding the gear shift control performed by lever operation (shift down operation) to the shift down position when the clutch is disengaged in the stopped state and the running state, the flow is omitted, but step 7 is performed in the stopped state in the down shift operation. ~ Similar to step 10, when the transmission is in neutral or reverse, the low speed starting stage (UP
When the transmission is not in neutral or reverse, the gear set to the side starting gear is changed to the gear corresponding to the current gear -n (usually n = 1).
Further, when the transmission is in reverse, no gear change is performed and the gear set to the shift stage selected from the shift map is selected when the transmission is in the neutral state, as in steps 15 to 19 in the downshift operation in the running state. When the transmission is not in neutral or reverse, a shift change to the gear position corresponding to the current gear -n is performed.

[0006]

By the way, in such a conventional example, even when a gear set request to the starting stage or reverse is generated by the shift lever, the vehicle is in a stopped state (including an extremely low speed below the stop judgment reference value). Otherwise, gears will not be set to these, so when changing the direction of the vehicle or putting it in the garage, you can not set the gear to the reverse and the start stage unless you reduce the vehicle speed to the stopped state, forward → backward → forward There was a problem that you could not perform quickly.

An object of the present invention is to solve such a problem.

[0008]

According to the present invention, as shown in FIG. 5, a gear shift actuator a for driving a gear shift mechanism of a transmission, a means c for generating a gear shift request to the transmission in response to a manual operation in a driver's cab, Means b for controlling the gear shift actuator so as to gear shift the transmission to the required position based on the generation request, and a request until the vehicle speed falls below the judgment reference value for stopping in response to the generation of a reverse or a gear set request to the starting stage. The means d for prohibiting the gear shift control to the position and the prohibition of the gear shift control under the condition that the gear set request to the starting stage is generated when the transmission is in the reverse running state and is equal to or less than the specified value higher than the judgment reference value for stopping. A means for releasing e is provided.

[0009]

[Function] According to this, in response to a gear set request to the reverse gear or the starting gear, the gear shift control is normally performed only when the vehicle speed is at or below the reference value, so that the gear is set smoothly to the reverse gear or the starting gear it can. When the vehicle is running backwards, the gear shift control is performed when the vehicle speed falls below the specified value based on the specified value higher than the stop reference value in response to the gear set request at the start stage, so the vehicle speed drops to the stopped state. You can quickly set the gear from reverse to the start stage at a higher vehicle speed than usual without waiting for you to do it. In other words, the vehicle can be swiftly moved from backward to forward.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of the entire apparatus showing an application example to a diesel engine vehicle, in which a control lever of a fuel injection pump 1 is driven in accordance with an accelerator opening degree and an engine rotation is made to match a required rotation. A throttle actuator 2 that controls the clutch and a clutch actuator 4 (air booster) that performs an on / off operation of the clutch 3 are provided. In order to realize multi-stage shifting with a small number of gears, the transmission 5 adopts a constant mesh type with a split gear and a range gear in front of and behind the main gear. A split actuator 7 and a range actuator 8 for switching the range gears to HL (high / low) are provided.

An accelerator sensor 10 for detecting a pedal depression angle (accelerator opening degree) corresponding to an engine load is provided on an accelerator pedal 9 as a means for detecting a driving state necessary for controlling the shift of a vehicle. An engine rotation sensor 11 that detects a rotation speed, a clutch stroke sensor 12 that detects a stroke position of the clutch 3, a pedal SW 14 and 15 that detects an initial position and an operating position of the pedal on the clutch pedal 13, and a main gear on the transmission 5. Position sensor 16 for detecting shift positions of split gear and range gear
18, a main shaft rotation sensor 19 (which functions as a vehicle speed sensor) for detecting the rotation speed of a propeller shaft connected to the main shaft, and a gear rotation sensor 2 for detecting the rotation speed of a main gear that idles on the main shaft.
0 is provided.

In the driver's cab, in addition to the shift lever device 21 (shifter) of the transmission 5, there is a multi-step mode in which the split gear is not switched for shifting (shift up, shift down) and the split gear is switched. A mode switch 22 to be selected and a monitor 24 for displaying the shift position of the transmission 5 and the on / off state of the mode switch 22 are provided. The shifter 21 has an operation pattern simplified into an h-type having five positions of shift up, shift down, hold, reverse, and neutral, and a shift up request, a shift down request, and a shift position are performed according to the range position of the shift lever. Hold request and reverse gear set request are generated.

The engine control unit 25 and the transmission control unit 26 control the drive of each actuator based on these various signals.
Then, when the clutch is disengaged in response to the generation request of the shifter 21, the transmission 5 is gear-shifted to the required position while the engine rotation speed is synchronously controlled.

FIG. 2 is a flow chart for explaining the gear shift control of the transmission control unit 26. When the clutch 3 is disengaged while the vehicle is stopped (when the vehicle speed is below the reference value for stopping the vehicle), the shift lever is set to the range position. Accordingly, the reverse gear is set to reverse and the neutral position is set to neutral (step 1 to step 6). Also, when the transmission 5 is in neutral or reverse, the gear set to the high-speed starting stage (UP side starting stage) is set by lever operation to the shift-up position (shift-up operation), and when the transmission 5 is not in neutral or reverse, the current stage is set. A shift change to a gear position corresponding to + n (n = 1 when the mode switch 22 is off and n = 2 when the mode switch 22 is on) is performed (steps 7 to 10).

When the clutch 3 is disengaged while the vehicle is running (when the vehicle speed exceeds the stopping reference value), the neutral position is set at the neutral position according to the range position of the shift lever, but the reverse position is set at the reverse position. Not set gears (step 11 to step 1
4). When the lever 5 is operated to the shift-up position (shift-up operation), the current gear + n (n = 1 when the mode switch 22 is off, n = when the mode switch 22 is on) unless the transmission 5 is in neutral or reverse. A shift change to a gear position corresponding to 2) is performed (steps 15 to 17). Further, when the transmission 5 is in neutral or reverse during the shift-up operation, according to a backward traveling flag described later,
If it is a flag set, the gear set to the high-speed start stage (UP side start stage) is set to the shift stage selected from the shift map if the vehicle speed is equal to or lower than the specified value higher than the judgment reference value for stopping. The gear setting is performed (step 18 to step 21).

Regarding the gear shift control performed by lever operation (shift down operation) to the shift down position when the clutch 3 is disengaged in the stopped state and the running state, the flow is omitted, but the shift down operation in the stopped state is performed. As in steps 7 to 10, when the transmission 5 is in neutral or reverse, the gear shift to the low-speed starting stage (starting stage on the DN side) corresponds to the current shift -n when the transmission 5 is not in neutral or reverse. Shift to the gear position. Further, when the transmission 5 is not in neutral or reverse as in step 15 to step 21 in the downshift operation in the running state, a shift change to the gear position corresponding to the current gear -n is performed and the transmission 5 is in neutral or reverse. If the flag is set in accordance with the reverse traveling flag, the gear set to the low speed starting stage (the starting side on the DN side) is set unless the vehicle speed is equal to or lower than the standard value higher than the judgment reference value for stopping, unless the flag is set. The gear is set to the shift stage selected from the shift map.

FIG. 3 is a flow chart for explaining the backward traveling flag control. When the transmission 5 is in reverse and the vehicle speed is in a traveling state in which the vehicle speed exceeds the reference value for stopping, a flag is set. Clears the flag (steps 1 to 4). Also,
If the transmission 5 is not reverse, the flag is cleared when the vehicle is stopped (steps 5 and 6).

With such a structure, in response to a gear set request for reverse and a gear set request for the start stage based on a shift up operation and a shift down operation,
Normally (when the reverse traveling flag is cleared), gear shift control is performed after the vehicle speed has dropped to the stopped state, so it is possible to smoothly set gears without causing a squeal in the reverse or starting stage. When the vehicle speed exceeds the criterion value for stopping when the vehicle is reversing, the reverse running flag is set, and the vehicle speed falls below a prescribed value higher than the criterion value for stopping in response to a gear set request to the start stage. Since the gear shift control is performed under certain conditions, it is possible to set the gear from reverse to the start stage faster than usual without waiting for the vehicle speed to drop to the stopped state. That is, it is possible to quickly switch from backward to forward.

Even when a shifter having a range position corresponding to the number of shifts of the transmission 5 is adopted as the shifter instead of the up-down type having five positions, and the gear shift control is performed in accordance with the range position, the vehicle travels backward. The function of controlling the gear shift to the start stage at a vehicle speed higher than usual by setting the hour flag can be effectively applied.

[0020]

According to the present invention, a gear shift actuator for driving a gear shift mechanism of a transmission, a means for generating a gear shift request to the transmission in response to a manual operation in a driver's cab, and a transmission request based on the generation request. A means for controlling the gear shift actuator so as to shift the gear to the position, and a means for prohibiting the gear shift control to the required position until the vehicle speed falls below the judgment reference value for stopping in response to the occurrence of a reverse or a gear set request to the starting stage. , When the transmission is in reverse and a gear set request is made to the start stage, a means for canceling the prohibition of gear shift control is provided on condition that the value is below a specified value that is higher than the reference value for stopping the vehicle. The vehicle speed drops to a stopped state when converting or entering the garage That of the without waiting, the effect is obtained that can quickly gear set from the reverse to the starting stage.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an entire apparatus showing an embodiment of the present invention.

FIG. 2 is a flowchart illustrating control contents of a control unit.

FIG. 3 is a flowchart illustrating control contents of a control unit.

FIG. 4 is a flowchart illustrating a conventional control content.

FIG. 5 is a diagram corresponding to claims of the present invention.

[Explanation of symbols]

 1 Fuel Injection Pump 2 Throttle Actuator 3 Clutch 4 Clutch Booster 5 Transmission 6 Gear Shift Actuator 7 Split Actuator 8 Range Actuator 10 Accelerator Sensor 11 Engine Rotation Sensor 12 Clutch Stroke Sensor 14, 15 Clutch Pedal Switch 16-18 Gear Position Sensor 19 Vehicle Speed Sensor 20 Gear rotation sensor 21 Shifter 22 Mode switch 25 Engine control unit 26 Transmission control unit

Claims (1)

(57) [Claims] 1. A gear shift actuator for driving a gear shift mechanism of a transmission, a means for generating a gear shift request to the transmission in response to a manual operation in a driver's cab, and a gear shift for the transmission to a required position based on the generation request. A means to control the gear shift actuator, a means to prohibit the gear shift control to the required position until the vehicle speed falls below the stop judgment reference value in response to the occurrence of a reverse or a gear set request to the starting stage, and the transmission runs in reverse. A shift control device for a vehicle, comprising means for canceling prohibition of gear shift control on condition that a gear set request to a starting stage is generated in a state of a predetermined value or less higher than a reference value for stopping a vehicle.