JPH052348Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an automatic transmission device for a vehicle that detects the running state of the vehicle and automatically changes the transmission.

[Prior Art] As is well known, in a vehicle automatic transmission system, a control device controls the driving state of the vehicle, such as vehicle speed, engine load, etc.
The system determines the degree of accelerator opening, etc., instructs and sets the number of gears in the transmission, and automatically performs a predetermined operation. (For example, Utility Application No. 59-70610 filed by the present applicant)
(Refer to Utility Model Application No. 60-182552). Therefore, the driver only needs to set the selector lever, press the accelerator pedal, or in some cases press the auto switch, and then operate the brake pedal and steering wheel, and the driving operation is free. It's very easy.

However, while such automatic transmission devices are convenient, various electronic devices may malfunction due to noise. For example, when the vehicle is parked or parked with the engine running, a signal error from various sensors or the control device may cause the control device to start the vehicle. If the handbrake is applied halfway at that time, abnormal start cannot be prevented.

This inconvenience is caused by the insufficient judgment ability of the control device.

[Object of the invention] Therefore, an object of the invention is to provide a vehicle transmission in which the control device does not malfunction due to noise or other signal errors.

[Structure of the invention] According to the invention, in an automatic transmission device for a vehicle that detects the running state of the vehicle and automatically switches the transmission, a pressure-sensitive sensor is provided in the driver's seat and detects the load on the driver's seat. It is equipped with an accelerator position sensor that works with the accelerator pedal, a clutch position sensor that works with the clutch pedal, and a selector lever position sensor, and determines whether the vehicle has stopped based on the signals from each sensor. If one of the signals fails, the signals from many other sensors are judged to be correct, and if the same number of different signals are emitted from the many sensors, a predetermined priority is set for each sensor's signal. The controller is equipped with a control device that determines that the higher priority is correct.

[Operations and Effects of the Invention] When the vehicle is parked and the driver gets out of the vehicle, the pressure sensor installed in the driver's seat does not detect the load. The control device then determines the presence or absence of that load. Furthermore, since the clutch pedal is not depressed unless the vehicle is driving, the control device determines that the clutch pedal is not depressed based on the signal from the clutch position sensor. Since the selector lever is in the parking or neutral position when the vehicle is parked or stopped, the control device determines that the vehicle is parked or stopped based on the signal from the selector lever position sensor. Furthermore, the accelerator pedal is not depressed while parked or stopped,
Based on the signal from the accelerator position sensor, the control device determines that the vehicle is parked or stopped.

However, it is possible, for example, to leave luggage on the seat when the driver gets out of the vehicle. In this case, the pressure sensor will determine that a driver is present. It is also possible that one of the sensors malfunctions, causing it to issue a signal indicating that the vehicle is not parked or stopped, or that the control device itself makes a misjudgment due to noise, etc. . Therefore, according to the present invention, the control device determines that the vehicle is parked or stopped if a large number of the above-mentioned signals indicate that the vehicle is parked or stopped. For example, even if a pressure-sensitive sensor outputs a signal indicating that a driver is present, if the other three sensors output signals indicating that the vehicle is parked or stopped, it is determined that the vehicle is parked or stopped.

Furthermore, if any sensor fails, the failed sensor is excluded and a determination is made using two sensors.
At that time, if one sensor and the other sensor produce different signals, the control device determines that the one with higher priority is correct.

Therefore, according to the present invention, even if there is noise or sensor failure, the control device can always determine that the vehicle is parked or stopped, and it is possible to prevent the risk of the vehicle starting unnecessarily.

[Preferred Embodiment] When implementing the present invention, a sensor for detecting whether the vehicle is parked or stopped can be optionally added. For example, pressure-sensitive sensors may be provided on both the seat (where the waist is) and the backrest of the driver's seat. Further, the parking brake may be provided with a parking sensor.
In this way, sensors that determine whether the vehicle is parked or parked can be added arbitrarily.

Therefore, in the following description of the embodiment, a first pressure-sensitive sensor provided on the seat, a clutch position sensor, a selection lever position sensor, an accelerator position sensor, and a second pressure-sensitive sensor provided on the backrest of the seat will be explained. We will explain the case where five sensors are used, and the priority order is the first pressure sensor, clutch position sensor, selector lever position sensor,
The order is the accelerator position sensor and the second pressure-sensitive sensor.

In carrying out the present invention, it is preferable that each sensor used to determine whether the vehicle is parked or parked performs an initial check before activation, and those in which an erroneous signal is detected are excluded. At that time, the priority is automatically increased except for that of the erroneous signal. In addition, the same number of sensors in one group determines that the car is parked.
When it is determined that another group is not parked or stopped, it is preferable to follow the determination of the higher average priority of the sensors of each group, or to issue a warning by setting the signal of the higher priority as positive.

[Examples] Examples of the present invention will be described below with reference to the drawings. In FIG. 1, a transmission 3 is attached to an engine 1 via a mechanical clutch 2, and its output shaft is connected via a propeller shaft 4 to a rear axle (not shown).

The engine 1 is provided with a rack drive device 21 for controlling the rack position of the fuel injection pump 5 and an engine rotation sensor 20.

The clutch 2 is provided with a clutch position sensor 6 that detects the engagement/disengagement state of the clutch, and a clutch actuator 7 that engages/disconnects the clutch.

The transmission 3 includes a countershaft rotation sensor 8 that detects the rotation speed of the main gear, and a vehicle speed sensor 9 that detects the rotation speed of the main shaft.
A shift position sensor 11 (ie, a position switch) that detects the shift position of the transmission, and a shift change actuator 10 that shifts the transmission are provided.

On the other hand, a selector 16 provided in a driver's cab (not shown) uses a selector lever 16a to switch reverse R, 1
Six ranges from speed to 6th speed and neutral N can be specified, and a position sensor or switch corresponding to each range is provided inside. The position of this selector lever 16a is determined by the shift position display device 35.
For example, it is now displayed on a lamp. In the figure, 13 is a clutch pedal, and 14 is an accelerator pedal. The accelerator pedal 14 is provided with an accelerator position sensor 50, and the injection pump control device 15 is controlled by the accelerator pedal 14. Signals from each of these sensors are input to a control device 17, and the control device operates each actuator based on these signals to perform a predetermined speed change operation or an engagement/disengagement operation of the clutch 2. Further, 27 is an alarm device. All of the above belong to known techniques.

However, as mentioned above, in order to prevent erroneous starting while parked or stopped due to an erroneous signal from the sensor, according to the present invention, the first pressure sensor 51 is provided in the seat portion of the driver's seat 50. A second pressure sensor 52 is also provided on the backrest. Whether or not these pressure sensors 51 and 52 are operating is determined by the pressure sensor display lamp 53 (first and second
pressure-sensitive sensors).

Additionally, an accelerator position sensor indicator lamp 48 that lights up when the accelerator pedal 14 is taken off (accelerator off) by the accelerator position sensor 50.
A clutch position sensor indicator lamp 49 is provided which lights up in response to a signal from the clutch position sensor 12 only when the clutch pedal 13 is depressed (when the clutch is disengaged).

The control device 17 includes, for example, an automatic parking/parking system 60 that applies a braking force when the handbrake is pulled, and an automatic parking/parking determination circuit 61 (hereinafter simply referred to as determination circuit). In the figure, 62 is a manual push button for operating the automatic parking system, and 63 is each sensor 12, 16, 50, 51, 5.
This is a display device that indicates that the judgment made by the judgment circuit 61 is insufficient when there are many failures of No. 2.

The judgment circuit 61 is provided with a correction means 64. This correction means 64 includes a push button (indicated by ) 65 corresponding to each sensor and a push button 6
A lamp 66 that is provided corresponding to No. 5 and is lit only when correction is made is provided so that, for example, the priority order can be corrected.

Next, the operation will be explained with reference to FIG.

First, the driver sits on the seat 50 and turns on the key switch (step S1). At this time, the first and second
Since the pressure-sensitive sensors 51 and 52 must both output signals, the judgment circuit 6 of the control device 17
1 determines whether the first and second pressure-sensitive sensors 51, 52 are generating signals (step
S2). If NO, no signal is generated. sensor 51
or exclude 52 from the subject of judgment (step
S3), that fact is memorized. Then, engine 1 starts (step S4), and pressure sensors 51 and 52
(excluding malfunctioning ones) (step
S5). Next, when the driver depresses the clutch pedal 13 (step S6), the judgment circuit 61 judges whether or not the clutch position sensor display lamp 49 is lit (step S7). Circuit 61 excludes the signal from clutch position sensor 12 (step S8) and this exclusion is stored. Next, the driver moves the selector lever 16a (step S9) to turn on the shift position indicator lamp 3.
5 is lit (step S10).
When the vehicle is parked or parked, the N (neutral) position is selected, so if the N position is not illuminated, the judgment circuit 61 removes the signal from the selector 16 (step S11). Next, the driver depresses the accelerator pedal (step S12). Then, the accelerator position sensor display lamp 48 lights up, but the judgment circuit 61 judges whether it is lit or not (step S13), and if NO, excludes the signal from the accelerator position sensor 50 (step S14) and stores this. do. Each of the above steps indicates the check function of the judgment circuit 61.

After checking each sensor in this way,
The vehicle enters the running state (step S15). In this case, the control device 17 performs clutch engagement and shifting operations depending on the driving state. Now, when the control device 17 detects that the running state has become zero speed by the vehicle speed sensor 9 (step S16), the judgment circuit 61 judges whether three or more sensors have failed based on the above-mentioned memory. (Step S17). And YES
In this case, the display 63 will indicate that there are many sensor failures.
(Step S18). If NO, no display will appear. The determination circuit 61 then determines whether a majority decision can be made using non-faulty sensors (step S19), and if NO, it is checked whether the determination can be made based on the average value of the priorities (step S20). This priority is, for example, 5 points for the pressure sensor 51, 4 points for the clutch position sensor 12, 3 points for the selector lever position sensor, 2 points for the accelerator position sensor 50, and 1 point for the pressure sensor 52. Determine whether the decision can be made based on priority. NO in step S20
If so, the one with higher priority is adopted (step S21), and if YES in step 21, the one with higher priority is adopted (step S22). If YES in step S19, the majority vote is adopted (step S23), and the judgment circuit 61 performs step S21,
Parking/stopping is confirmed based on S22 and S23 (step S24). If NO, start again (step
S32). If YES, the judgment circuit 61 is the control device 1
7 to confirm that the vehicle is parked or stopped (step S25), the actuator is deactivated (step S26), and the actuator is automatically parked or stopped. Activate system 60 (step
S27), apply braking force. This completes the parking/stopping operation.

Next, when restarting the vehicle, the determination circuit 61 determines whether or not the accelerator position sensor 50, clutch position sensor 12, and selector sensor are all correct for checking (step S28), and if NO, an alarm is activated to that effect. 27, the driver presses the manual button 62 (step S29), cancels the automatic parking system 60, eliminates the braking force, and manually starts the vehicle. If YES in step S28, the determination circuit 61 determines whether one of the accelerator, clutch, and selector sensors is on (step S30), and if YES, the automatic parking system 60 automatically (step S31),
Release the brake force and restart (step
S32).

[Summary] As described above, according to the present invention, parking or stopping is determined using a pressure-sensitive sensor that detects the load on the driver's seat, an accelerator position sensor, a clutch position sensor, and a selector lever position sensor. Even if one of the sensors malfunctions, it can be determined whether the vehicle is parked or stopped based on priority and majority vote, so there is no risk of the control device malfunctioning due to noise or failure and causing the vehicle to start.
Therefore, it is extremely safe to implement this type of automatic transmission for vehicles.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of an automatic transmission for a vehicle implementing the present invention, Fig. 2 is a perspective view showing an example of an automatic parking/stop judgment circuit correction device, and Fig. 3 is a flow sheet diagram showing an example of the invention. be. 9... Vehicle speed sensor, 12... Clutch position sensor, 16... Selector, 17... Control device, 50
...Accelerator position sensor, 51...First pressure sensor, 52...Second pressure sensor, 60...Automatic parking/parking system, 61...Judgment circuit, 62...Manual button.

Claims (1)

[Scope of utility model registration request] Automatic transmission systems for vehicles that detect the vehicle's driving condition and automatically change the transmission include a pressure-sensitive sensor installed in the driver's seat that detects the load on the driver's seat, and an accelerator position sensor that is linked to the accelerator pedal. , equipped with a clutch position sensor that works with the clutch pedal and a selector lever position sensor,
In addition to determining whether the vehicle has stopped based on the signals from each sensor, if one of the signals from each sensor is malfunctioning, the signals from many other sensors are determined to be correct, and different signals are sent from those many sensors. An automatic transmission device for a vehicle, comprising a control device that sets a predetermined priority to the signals of each sensor when the same number of signals are emitted, and determines that the higher priority is correct.