JPH071320Y2 - Electronically controlled automatic transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a transmission for a vehicle without a clutch pedal, which comprises a vehicle speed sensor, an engine speed sensor, an accelerator opening sensor, and a shift lever position sensor. The present invention relates to an electronically controlled automatic transmission that automatically shifts by a signal.

[Prior Art] An automatic transmission in which a clutch actuator is engaged and disengaged without a clutch pedal,
The applicant of the present invention has made various proposals. In Japanese Utility Model Laid-Open No. Sho 62-54029, the vehicle is shifted to the second speed, and the clutch is controlled so that the clutch is engaged while keeping the clutch in the half clutch state based on the slip ratio. There is disclosed a technique for coping with a poor startability such as engine stall by shifting to the first speed when the clutch is in the half-clutch state after a lapse of a predetermined time. Further, Japanese Utility Model Laid-Open No. 62-71458 discloses an air circuit for a clutch actuator of an automatic transmission in which an auxiliary air tank and an air tank are connected in parallel, and switching means is provided for selectively connecting both tanks to a clutch actuator. Is proposed.

In the above conventional electronically controlled automatic transmission, how to connect the clutch is given as a map having a linear relationship with the accelerator pedal opening.

However, when there is no air supplied to the clutch actuator, the shift lever is set to neutral and the engine is started, and after the start, the accelerator is blown to increase the air pressure quickly. If the air pressure is raised to the operating range of the clutch actuator when operated to any of the advancing stages, the clutch actuator may be actuated by blowing the accelerator, and the clutch may suddenly connect and start suddenly.

Further, since the control unit determines the signal from each sensor as described above, the clutch may suddenly connect and suddenly start even if one of the sensors fails.

In Japanese Patent Laid-Open No. 62-199532, the accelerator pedal is depressed while the pressure of the air supply source supplied to the air actuator is below the operating pressure, and in this state the pressure of the air supply source is above the operating pressure. There is disclosed a technique in which the starting operation is prohibited even in the case of, and when the accelerator pedal is once returned and then the accelerator pedal is stepped on again, the starting operation is performed for the first time at this time. However, in such a known technique, as described above, a danger arises when so-called engine blow-up occurs in which the engine speed increases without depressing the accelerator pedal due to a sensor accident or the like.

[Problem to be Solved] Therefore, an object of the present invention is to prevent an abrupt start of a vehicle due to an erroneous operation of a shift lever or a malfunction of a sensor, for example, in the process of air pressure reduction and air filling. To provide an electronically controlled automatic transmission with high safety.

[Means for Solving the Problem] According to the electronically controlled automatic transmission of the present invention, it is determined whether or not a shift change should be made based on signals from a vehicle speed sensor, an engine speed sensor, an accelerator opening sensor, and a shift lever position sensor. Shift change determination circuit, a shift change control circuit that controls a shift change based on the output of this shift change determination circuit and a signal from the shift position sensor, and the output of this shift change control circuit and the signal from the engine speed sensor Based on the engine control circuit that controls the accelerator actuator, the clutch control circuit that controls the clutch actuator based on the signals from the clutch position sensor and the air pressure warning lamp circuit, the vehicle speed sensor, the counter shaft rotation sensor, and the shift position sensor. Shift change control It is equipped with a control unit consisting of a transmission control circuit that controls the cheater and turns on, off, or blinks the neutral indicator lamp.This control unit has the air pressure warning lamp lit by the signal from the air pressure warning lamp circuit. If so, it is determined whether or not the accelerator pedal is depressed by the signal from the accelerator opening sensor while the air is being filled after the engine is started, and when the accelerator pedal is depressed, the signal from the shift lever position sensor causes the shift lever to become neutral. If it is determined that it is operated other than neutral, it is determined whether the air pressure alarm lamp goes off and the air pressure is above a predetermined value, If the air pressure is above a certain value, the neutral indicator lamp blinks. This blinking continues until the shift lever becomes neutral, and the clutch control is performed after the shift lever becomes neutral. Road has a function for connection of the clutch.

[Explanation of action and effect] It is assumed that the air pressure is low when the key switch is turned on at the time of starting, so the air alarm lamp is lit. The driver then moves the shift lever to the neutral position,
If the vehicle is accidentally placed in the forward or reverse position, the vehicle will start to move, and if the air pressure is not sufficient, the brakes will operate poorly and are dangerous. Therefore, in the present invention, even if the air pressure alarm lamp is turned off, the start control, that is, the clutch control circuit does not operate unless the shift lever is in the neutral position. It is therefore safe.

In addition, even if the accelerator pedal sensor fails and the engine blows up, it is safe.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, the engine 10 includes a mechanical clutch.
A non-synchronized transmission 30 is attached via 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 actuator 13 that controls a governor 11a of a fuel injection pump 11 and an engine speed sensor 12 that is an engine speed detection unit.

The clutch 20 is provided with a clutch position sensor 21 that detects the stroke position of the clutch and a clutch actuator 22 that connects and disconnects the clutch.

The transmission 30 is provided with a vehicle speed sensor 32 that detects the vehicle speed from the number of revolutions of the main shaft that is the vehicle speed detection means, a counter shaft rotation sensor 33, a shift position sensor 34, and a shift change actuator 35. .

In addition, the shift lever 50 has a shift lever position sensor 51
Is provided. These sensors 12, 21, 32, 33, 3
4, 51 and the actuators 13, 22, 35 are respectively connected to a control unit 40 which is a control means, and the control unit
An accelerator opening sensor 15 for detecting the opening of the accelerator pedal 14 and a shift lever position display device are connected to 40,
A neutral indicator light 16 is provided as one of the shift lever position display devices.

Further, the air compressor 17 provided in the engine 10 is
The air circuit L ₁ is connected to the clutch actuator 22 and the like via the air tank 18. The air tank 18 is provided with a pressure switch 23 that is an air pressure detecting means that closes when the air pressure is below a predetermined value (for example, 5.2 kg / cm ² ). The pressure switch 23, the air pressure warning lamp circuit l ₁ connected to the contacts and the coil of the relay 24, an air pressure warning lamp 25 and the control unit 40 are connected in parallel by the circuit l ₁ in the relay 24 .

In FIG. 2, the control unit 40 is composed of a microcomputer, and includes a vehicle speed sensor 32, an engine speed sensor 12,
Based on signals from the accelerator opening sensor 15 and the shift lever position sensor 51, a shift change determination circuit 41 for determining whether or not a shift change should be performed, and an output of this circuit 41 and a signal from the shift position sensor 34. Shift change control circuit 42 for controlling shift change by
An engine control circuit 4 for controlling the accelerator actuator 13 based on the output of 42 and a signal from the engine speed sensor 12
3. A clutch control circuit 44 for controlling the clutch actuator 22 based on signals from the clutch position sensor 21 and the air pressure alarm lamp circuit l ₁ , a vehicle speed sensor 32, a counter shaft rotation sensor 33, and a shift based on signals from a shift position sensor 34. A transmission control circuit 45 for controlling the change actuator 35 and for turning on, off or blinking the neutral indicator lamp 16 is provided.

Next, the operation will be described mainly with reference to FIG. When starting the vehicle in the parked state, the driver first turns on the key switch, but at this time, the air pressure alarm lamp 25 is in a lighting state, that is, the air pressure is not sufficient (YES in step S1). The driver returns the shift lever 50 to the neutral position (step S2), but at that time, the driver mistakenly moves it to either the forward or reverse direction other than the neutral position, and the key switch is turned on there ( Step S3). Then, when the key switch is set to the starting position and the engine is started (step S3), air is filled by the compressor 17 (step S4). When the air pressure is sufficient and the air pressure alarm lamp 25 is not lit, the start control is started after the normal start control (step S11), and the clutch is turned on (step S10). It is determined whether or not the accelerator pedal 14 is depressed based on the signal from the accelerator opening sensor 15 during the air filling in step S4 (step S5). If NO, the process returns to step S4, and if YES, it is determined based on a signal from the shift lever position sensor 51 whether the shift lever is operated other than neutral (step S6). In the case of NO, the process returns to step S4, and in the case of YES, it is determined whether or not the alarm lamp 25 is turned off, that is, whether or not the air pressure is a predetermined value (for example, 5.2 kg / cm ² ) or more (step S7 ). If NO, return to step S4; if YES, neutral display lamp 1
Flashes 6 to warn the shift lever to return to neutral (step S8). This warning reveals that the driver accidentally moved the shift lever to a non-neutral position, and moves the shift lever to the neutral position. The control unit 40 determines, based on the signal from the shift lever position sensor 51, whether the shift lever has been returned to the neutral position (step S9),
If NO, wait until YES, and if YES, shift to start control and output a control signal from the clutch control circuit 44 to the clutch actuator 22 to connect the clutch (step S10).

As described above, according to the present invention, even if the driver accidentally puts the shift lever in the forward or reverse position, an alarm is issued unless the shift lever is in the neutral position, and the clutch is not engaged, so that the driver accidentally starts. Can be prevented. Also, by any chance,
Even if the accelerator pedal sensor fails and the engine blows up, it is safe because the clutch is not engaged.

[Effect of Device] As described above, the present invention has the following excellent effects.

(I) When the engine is started and the air is filled, the clutch can be operated only when the shift lever is in the neutral position, so there is no unexpected start due to a malfunction.

(Ii) It is safe because the clutch will not operate even if the engine is blown up due to a malfunction of the accelerator pedal sensor.

(Iii) Since the warning is given by the neutral display lamp, it is convenient that the driver is not neutral either.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, FIG. 2 is a control block diagram, and FIG. 3 is a control flow chart diagram. 16 …… Neutral indicator lamp, 22 …… Clutch actuator, 23 …… Pressure switch, 25 …… Air pressure alarm lamp, 40
……Controller unit

Claims (1)

[Scope of utility model registration request] 1. A shift change determination circuit for determining whether or not a shift change should be performed based on signals from a vehicle speed sensor, an engine speed sensor, an accelerator opening sensor, and a shift lever position sensor, and an output of this shift change determination circuit. A shift change control circuit for controlling a shift change based on a signal from a shift position sensor, an engine control circuit for controlling an accelerator actuator based on an output of the shift change control circuit and a signal from an engine speed sensor, and a clutch position. While controlling the shift change actuator based on the signals from the clutch control circuit and the vehicle speed sensor that controls the clutch actuator based on the signal from the sensor and the air pressure alarm lamp circuit, the counter shaft rotation sensor, and the shift position sensor,
It is equipped with a control unit consisting of a transmission control circuit that lights, turns off or blinks the neutral indicator lamp, and this control unit, if the air pressure warning lamp is lit by the signal from the air pressure warning lamp circuit, after engine start The signal from the accelerator opening sensor is used to determine whether the accelerator pedal is being pressed during air filling, and when it is being pressed, the signal from the shift lever position sensor is used to operate the shift lever other than neutral. If it is determined that the operation is performed other than neutral, the air pressure alarm lamp goes off and it is determined whether the air pressure is equal to or higher than a predetermined value. If so, the neutral indicator lamp blinks, this blinking continues until the shift lever becomes neutral, and after the shift lever becomes neutral, the clutch control circuit connects the clutch. Electronically controlled automatic transmission, characterized in that it has a.