JPH0531316Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a shift control device that is used in an automatic shift system that automates the starting, starting, and shifting of a vehicle, and is capable of selectively starting in first gear.

(Prior art) One of the automatic transmission systems for vehicles uses a clutch actuator to engage and disengage the clutch, a gear shift unit to change the gear train of the transmission, and an electronic governor in the injection pump to adjust the engine speed. In addition, a clutch actuator and a gear shift unit are driven by an automatic transmission controller, and an electronic governor is driven by an engine controller.

The automatic shift controller used here is equipped with an accelerator opening, a vehicle speed, and a gear selection map for determining a more optimal gear. When the transmission switch commands automatic gear range, it selects the optimum gear based on the current vehicle speed and accelerator opening based on the gear selection map, and controls the gear position to match that gear. Let's do it.

One of the starting processes performed by such an automatic transmission controller is disclosed in the specification and drawings of Japanese Patent Application No. 163669/1983. In this disclosed starting method, first, when an automatic gear position command for selecting a gear position of 2nd gear or higher and a 1st gear start command from a 1st gear start switch that is switched at a timely manner are received, the starting gear is changed to 2nd gear. Start is performed as 1st gear instead of 1st gear.

This makes it easier to start uphill when loaded.

By the way, in the transmissions of large vehicles, synchronizer mechanisms are often not installed in the 1st gear gear train, which is rarely used, and it is recommended to reduce the rotation of the clutch output shaft side when switching to 1st gear. It is customary. Taking this into consideration, the above-mentioned prior art first switches the gear train to 2nd gear to reduce the rotation speed on the clutch output shaft side, and then performs control processing to suppress gear noise and switch to 1st gear. is suggesting.

(Problem to be solved by the invention) However, when the gear train is once shifted to the second gear and the rotation of the clutch output shaft is waiting to decrease, there are cases where it is desired to start the vehicle without waiting for this decrease in rotation, in which case the control is in a loop due to the time wait and other operations cannot be accepted. This is particularly problematic when restarting the vehicle when it is moving in the second gear.

An object of the present invention is to provide a shift control device for an automatic transmission that can smoothly restart the vehicle when a first speed start command is issued.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a shift switch that issues an automatic gear position command that automatically selects the optimum gear position in the second or higher gear positions, and The above-mentioned automatic gear position command is generated by receiving each information from the 1st speed start switch that issues a start command, the gear position sensor that outputs gear position information of the transmission, and the clutch rotation sensor that outputs rotation information on the clutch output shaft side. and a means for switching to first gear again and waiting for start, on condition that the rotation on the clutch output shaft side has decreased to a predetermined rotation speed after shifting the gear position to second gear when a first gear start command is input. In a shift control device for an automatic transmission with a built-in device, information from an accelerator sensor that outputs accelerator opening information is received, and before the gear position changes from 2nd gear to 1st gear, the gear position of the accelerator is When the pedal is depressed, a configuration is adopted that includes means for performing start processing in second gear.

(Function) If the accelerator pedal is depressed before the gear position is changed from 2nd gear to 1st gear, control processing can be performed so that the vehicle starts in 2nd gear despite the 1st gear start command.

(Embodiment) FIG. 1 shows a shift control device for an automatic transmission which is an embodiment of the present invention. This speed change control device consists of a microcomputer, drive circuits for various actuators, various relay circuits, power supply circuits, etc. The microcomputer stores an automatic speed change control program and controls the control by issuing control commands in response to each input signal. Equipped with circuit (CPU) 1.

An automatic transmission using this speed change control device includes an electronic governor 3 as a fuel supply means that drives an injection pump 2 of an engine E, and an engine controller 4 that drives this governor based on vehicle load information.
and clutch 5 in the power transmission system following engine E.
a clutch actuator 6 for engaging and separating the
A gear shift unit 8 that can change the gear train of the transmission 7, an engine rotation sensor 9 that outputs engine rotation speed information, and a clutch that outputs information on the rotation speed of the output shaft of the clutch 5 (hereinafter simply referred to as clutch rotation speed). a rotation sensor 10, a vehicle speed sensor 11 that outputs vehicle speed information, a clutch stroke sensor 12 that outputs stroke information of the clutch 5,
A gear position sensor 13 that outputs gear train arrangement (gear position) information and a clutch actuator 6.
an air pipe system 19 that supplies air from an air source 18 to the three solenoid valves 14, 15, and 16 and a plurality of solenoid valves 17 (only one is shown) of the gear shift unit 8; and a speed change switch 20 that issues a gear position command; An accelerator sensor 21 that outputs accelerator opening information and a power source 2
The present invention includes a power supply circuit 23 that supplies two electric power to each controller, solenoid valve, etc., and a first speed start switch (hereinafter referred to as an FSS switch) 24 that issues a first speed start command.

Note that the engine controller 4 receives load information,
The injection pump 2 is operated via an electronic governor to control engine rotation based on various idle up information and the like.

The gear shift unit 8 has a power cylinder that operates a select fork and a shift fork (not shown) in the transmission 7, and receives air from an air source 18 in response to selective switching of a plurality of solenoid valves 17 to shift the gear train to a predetermined position. Operates to change gears. The arrangement pattern of this gear stage is shown in FIG.

By operating the change lever 201 in the shift direction Y and the select direction X, the shift switch 20 can select each range of 5 forward gears and 1 reverse gear in manual gear, and can also select Pw and D ranges as automatic gear gear. . The Pw range provides a shift characteristic with good acceleration, and the D range provides a shift characteristic with good fuel efficiency, and the corresponding gear selection map (an example of which is shown in Figure 3) is set according to each shift command. The selected and most suitable gear stage is determined by the shift control device.

A transmission control device connected to such various devices selectively directs accelerator opening information from an accelerator sensor and an accelerator pseudo signal calculated based on various vehicle information to the engine controller 4 via a switching relay switch (not shown). Output. Moreover, the control process determines the optimum target gear based on various input information, the clutch engagement/disengagement control process via the clutch actuator 6, the gear position switching control process of the gear train via the gear shift unit 8, or the air source. Each control process such as switching to a sub-tank (not shown) at 18 is performed in accordance with a predetermined control program, and the vehicle is started, started, and shifted.

Of the automatic shift control program built into the control circuit 1 of such a shift control device, the main routine is shown in FIG. 4, the start routine is shown in FIG. 5, and the change routine is shown in FIG. 6.

Below, the main routine executed by the control circuit 1,
The start routine and change routine will be explained. It should be noted that other functions, such as a shift routine, may be a known program, and their explanation will be omitted here.

When the program starts in Figure 4,
The control circuit 1 performs initial settings such as clearing the memory and reading dummy data so that the clutch 5 is held at the LE point, which is the clutch stroke position immediately before the half clutch as the start standby position. After this, the engine starts the well-known starting process, and after the starting process, the current vehicle speed reaches the specified value 4.
Controls whether or not it falls below Km/h. At speeds above 4 km/h, it is suitable for gear change processing, and below, it is determined whether the gear position is neutral N or not. If the clutch rotation speed NCL is in neutral, the process proceeds to the start process, and if the clutch rotation speed NCL exceeds the specified value, the process proceeds to the gear shift process to change the gear train according to the vehicle speed, and if it is below the specified value, the process proceeds to the start gear. When the clutch is disengaged, the process proceeds to the start process, which is followed by the engagement operation.

Note that a time interrupt is applied to the main routine in order to execute the rotation speed calculation routine at predetermined intervals. As a result, the engine rotation speed NE, the clutch rotation speed NCL, the amount of change ΔNE of the engine rotation speed per unit time, and the amount of change ΔNCL of the clutch rotation speed per unit time are calculated, respectively. Moreover, when the engine speed NE is less than the engine stall prevention speed (determined in advance), the flag ENSTFLG is set to 1.

Next, the start and change routine will be explained with reference to FIGS. 5 and 6. First, control circuit 1
turns on the first normally closed solenoid valve 14 and the normally open solenoid valve 16 to shut off the clutch 5. Then, in order to idle the engine, an accelerator pseudo signal is generated.
Output V _AC , initialize each flag, and proceed to step a4. Here, it is determined whether the engine speed NE has fallen below the engine stall prevention speed (determined in advance), that is, whether the flag ENSTFLG is 1 or not. Then, in 1, return to step a1,
If the flag is 0, that is, cleared, change processing (step a5) is entered.

This change process will be explained with reference to FIG. First, an air check is performed based on air pressure information from an air pressure sensor (not shown) on the air source 18 side, and when there is a sub tank (not shown) and the main tank runs out of air, the tank switching solenoid valve is activated. Processing such as turning on or lighting an emergency lamp (not shown) is performed. Next, it is determined whether the change lever 201 is in the automatic gear range D or _PW , and if they are different, the gear gear specified by the manual is selected as the target gear (step b4). It is determined whether or not the FSS switch 24 is in the automatic gear range and on, and if it is off, the process proceeds to step b5 and the starting gear is set to 2nd gear, and if it is on, the process proceeds to step b6 and the starting gear is set to 1st gear. .

After this, it is determined whether the current gear position is the target gear position or not, and if it is different, go to step b8, and if it is the same, go to step b9.
Proceed to and clear the flag FSSFLG.

In step b8, it is determined whether the clutch is disengaged or not. If the clutch is not disengaged, a clutch disengagement signal is output, and the process returns to step b1. If the clutch is disengaged, maintain the current state and turn change lever 2 again.
It is determined whether or not 01 is an automatic gear. If the gear is an automatic gear, the process proceeds to step b14; otherwise, the process proceeds to step b13. In step 14, it is determined whether the FSS switch 24 is on or not, and if it is on, the process goes to step 15, and if it is off, the process goes to step 13, outputs a gear change signal to the target gear, and returns to step b1.

In step 15, it is determined whether the flag FSSFLG is 1 or not, and the process proceeds to step b16, which is initially on the NO side, where it is determined whether the gear train is in 2nd gear or not. Then, a shift signal is output to change the gear position to the second gear.

From step b15 to b19, that is, flag FSSFLG
If is 1, it is determined whether or not the clutch rotational speed NCL has decreased to a rotational speed that allows switching to the first gear. If the clutch rotational speed NCL has decreased, the process proceeds to step b13, and a shift signal for shifting to the first gear is output. If it does not decrease, the process proceeds to step b20, where it is determined whether or not the accelerator is depressed. If not, the process returns to step b1, and if there is, the process proceeds to step b21.

In this step b21, the gear train is set to neutral N.
Determine whether it is in the 1 position, and if it is, step
Proceed to step b24, and if not, determine whether or not the engine has stopped, and if the engine has stopped, connect the clutch and proceed to step b24; if the engine has not stopped, proceed to step b24, where the above-mentioned solenoid valve for tank switching during air check is activated. Off, ie, cancels switching and returns.

In this way, in the change process, the starting gear in manual gear is set as the target gear (determined each time),
The starting gear in automatic gear is usually 2nd gear, and FSS
When the switch 24 is turned on, unless the accelerator is turned on, the gear is set to 1st gear, and when the accelerator is turned on (if the switch to 1st gear is not made at that time), it is processed as 2nd gear.

In the start routine after the change processing, the step
Proceed to step a6, and if the gear position is neutral N, proceed to step a4; otherwise, the clutch is held at the LE point, and then the clutch is engaged according to a predetermined temporal engagement pattern determined according to the accelerator opening degree. are connected to transmit engine rotational force to the clutch output shaft side, which is the wheel side. and step a9
It is determined whether the clutch engagement is completed or not, and if the clutch is not engaged, the process returns to step a4. If the clutch is engaged, the flag LEFLG is cleared and the process returns.

(Effect of the invention) This shift control device is capable of immediately shifting to 2nd gear even if a 1st gear start command is issued in the automatic gear range, if the accelerator is pressed before the shift from 2nd gear to 1st gear is made. It is possible to start the vehicle in gear, thereby preventing a delay in starting when there is a 1st gear start command.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a shift control device for an automatic transmission showing an embodiment of the present invention, FIG. 2 is a diagram showing an arrangement pattern of gear stages of a transmission in the shift control device, and FIG. The figure is a conceptual diagram of a gear selection map used in the transmission control device, and FIGS. 4, 5, and 6 are flowcharts of control programs used in the transmission control device. DESCRIPTION OF SYMBOLS 1... Control circuit, 5... Clutch, 7... Transmission, 10... Clutch rotation sensor, 11... Vehicle speed sensor, 12... Clutch stroke sensor, 1
3... Gear position sensor, 20... Gear shift switch,
21... Accelerator sensor, 24... FSS switch.

Claims (1)

[Scope of Claim for Utility Model Registration] A gear change switch 20 that issues an automatic gear position command that automatically selects the optimum gear position from the second gear or higher;
a first speed start switch 24 that issues a first speed start command;
Receives each information from the gear position sensor 13 that outputs gear position information of the transmission 7 and the clutch rotation sensor 10 that outputs rotation information on the clutch output shaft side, and inputs the automatic gear position command and 1st speed start command. When the gear position is set to 2nd gear, the automatic transmission has built-in means b12 to b19 for switching back to 1st gear and waiting for start on condition that the rotation of the clutch output shaft side has decreased to a predetermined rotation speed. In the shift control device of the transmission, information is received from an accelerator sensor 21 that outputs accelerator opening information, and the accelerator is depressed before the gear position changes from second gear to first gear. A shift control device for an automatic transmission, characterized in that it has a means b20 for performing start processing in second gear.