JP3547266B2 - Automatic transmission control device for vehicles with airbags - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an automatic transmission control device for a vehicle equipped with an airbag.
[0002]
[Prior art]
As a conventional automatic transmission control system, there is a control system described in a maintenance manual for NISSAN full-range electronically controlled automatic transmission 5E-AT (issued by Nissan Motor Co., Ltd. in June 1989). As shown in FIG. 3, a vehicle signal such as a vehicle speed V, an engine signal such as a throttle opening TH and an engine rotation speed N, and a transmission signal such as an oil temperature T are transmitted to an automatic transmission control unit A / TCU (A / T control unit), based on these input signals, the automatic transmission control unit A / TCU outputs a transmission control signal to the automatic transmission A / T, and the shift solenoids A to T of the control valve C / V Output solenoids such as C, overrun clutch solenoid D, lockup solenoid E, and line pressure solenoid F are controlled. It should be noted that a signal is also output from the automatic transmission control unit A / TCU to the engine central control system ECCS control unit.
FIG. 4 shows a conventional airbag control system mounted on a vehicle. This is because when the ignition sensor is operated and the G sensor 102 of the airbag sensor unit 100 (also referred to as an airbag control unit) detects that a gravitational acceleration greater than a predetermined value acts on the vehicle, the CPU 104 The driving circuits 106 and 108 are driven by a command signal from the driver and the driver airbag module 110 and the passenger airbag module 112 are opened. In such a conventional vehicle equipped with an airbag, the automatic transmission control device A / TCU is configured to control the automatic transmission A / T irrespective of the activation / deactivation of the airbag. Therefore, the automatic transmission A / T stays at the transmission gear position according to the set control conditions both during and after the operation of the airbag, and also controls the hydraulic control according to the control state. The current is still supplied to an output system such as an output solenoid for controlling the lock-up clutch.
[0003]
[Problems to be solved by the invention]
However, in the above-mentioned conventional airbag-equipped vehicle, the driving torque of the vehicle may be excessively large at the set shift gear position when viewed from an emergency situation in which the airbag is activated, and the driver may not be able to operate the vehicle. There is a problem that the vehicle tends to travel forward with a large driving torque in a state where the vehicle cannot be steered temporarily.
An object of the present invention is to solve such a problem.
[0004]
[Means for Solving the Problems]
According to the present invention, when the airbag is activated, the power supply to the electromagnetic switching means of the automatic transmission is cut off, and accordingly, the gear position is forcibly fixed to a predetermined gear position having a small driving torque. By doing so, the above-mentioned problem is solved. That is, the automatic transmission control device for an airbag-equipped vehicle according to the first aspect of the present invention outputs an airbag activation signal when an airbag and a vehicle body are detected to have a predetermined or more shock. Is mounted on a vehicle having an airbag control unit and a plurality of detection means such as a load sensor and a vehicle speed sensor, and drives a plurality of electromagnetic switching means of the automatic transmission based on signals from the plurality of detection means. By performing the control, the shift speed, lock-up, and clutch oil pressure are each switched, so that the shift is performed according to the traveling state of the vehicle, and a predetermined driving torque with a small driving torque when the electromagnetic switching unit is not energized. To achieve the following gears ,
The airbag control unit is configured to output the airbag activation signal to the airbag and the automatic transmission control device, respectively, and the automatic transmission control device is configured to output the airbag activation signal when the airbag activation signal is input. Are characterized in that the power supply to the electromagnetic switching means is cut off.
According to a second aspect of the present invention, when the power supply to the electromagnetic switching means is cut off by the input of the airbag operation signal, the automatic transmission control device sets the ignition key switch to the off position, and then turns on the ignition key switch. Only when the position is set, the cutoff of the power supply to the electromagnetic switching means is released.
[0005]
[Action]
According to the first aspect of the present invention, when the operation of the airbag is detected, the automatic transmission control device cuts off the power supply to the output solenoid for controlling the hydraulic pressure of the automatic transmission and controlling the lock-up clutch. As a result, the electromagnetic switching means is turned off. As a result, the transmission gear position of the automatic transmission achieves a predetermined gear position with a small output torque, so that even after the airbag is activated, even if the driver becomes temporarily unable to steer, the vehicle remains at a large driving torque. It is possible to keep the passenger safe without holding or traveling.
According to the second aspect of the present invention, when the power supply to the output solenoid is cut off due to the operation of the airbag, the automatic transmission control device sets the ignition key switch to the off position, and then sets the ignition key switch to the on position. Only when this is done, the interruption of the power supply to the electromagnetic switching means is released. As a result, the vehicle can be driven under normal shift control after the airbag is activated.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a block diagram showing a configuration of a control system of an airbag-equipped vehicle in which the present invention is implemented. The airbag module 10 is provided, for example, in each of a driver's seat and a passenger's seat in a vehicle cabin. When the airbag control unit 12 detects that a gravitational acceleration G of a predetermined level or more acts on the vehicle, the airbag module 10 will be used. It is controlled by an activation signal S1. The airbag control unit 12 outputs the airbag activation signal S1 to the airbag module 10 and also outputs to the A / T control unit (automatic transmission control device) 14. The A / T control unit 14 receives a vehicle signal such as a vehicle speed V, an engine signal such as a throttle opening TH and an engine rotation speed N, and a transmission signal such as an oil temperature T, as in the prior art. , A transmission control signal S2 is output from the A / T control unit 14 to the A / T (automatic transmission) 16 to control the control valve C / V of the A / T 16. In the A / T control unit 14 of the present invention, when the airbag activation signal S1 is input from the airbag control unit 12, the power supply to all the output systems such as the solenoids is cut off. As a result, the transmission gear position of the A / T 16 is forcibly fixed to the third speed position, the line pressure is maximized, the lock-up is released, and the minimum output torque is maintained with the overrun clutch engaged. The vehicle can be driven under the condition.
[0007]
FIG. 2 shows a control flow of the automatic transmission control device for an airbag-equipped vehicle according to the present invention. First, it is checked whether the ignition key (IGN KEY) is on (step 50). If yes, then it is checked whether the flag is "1", that is, whether the A / T 16 is in a fail-safe state in conjunction with the operation of the airbag module 10 (step 52). If the flag is 0, it is checked whether the airbag module 10 is operating (step 54). If yes, the fail safe state is set to A / T16. That is, the flag is set to "1" (step 56). Next, the output of the A / T control unit 14 is controlled to "0" to cut off the power supply to the output system such as all the solenoids of the automatic transmission (step 58), and the control is terminated.
If no (IGN KEY is off) in step 50, the fail-safe state is released, that is, the flag is set to "0" (step 60), and the control is terminated.
If the flag is "1" in step 52, the process jumps to step 58.
If the determination in step 54 is NO (the airbag is in the inactive state), the control is terminated.
[0008]
【The invention's effect】
As described above, according to the present invention, when the operation of the airbag is detected, the automatic transmission control device controls the hydraulic pressure of the automatic transmission and the lock-up clutch. By shutting off the power supplied to the output solenoid, the electromagnetic switching means is turned off. As a result, the transmission gear position of the automatic transmission forcibly achieves a predetermined gear position with a small output torque, so that even if the driver becomes temporarily unable to operate after the airbag is activated, the vehicle is large. It is possible to protect the occupant's safety without running with the driving torque.
According to the second aspect of the present invention, when the operation of the airbag is detected, the automatic transmission control device switches to the electromagnetic switching means only when the ignition key switch is turned off and then turned on. Release the cutoff of the power supply. Thus, even in the vehicle having the configuration according to the first aspect, after the driver confirms that there is no malfunction after the airbag is activated, the vehicle operates the ignition key switches in the above-described order to operate the vehicle. The vehicle can be driven under normal shift control.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an automatic transmission control system of an airbag-equipped vehicle embodying the present invention.
FIG. 2 is a diagram illustrating a control flow of an automatic transmission control device of a vehicle equipped with an airbag.
FIG. 3 is a diagram showing a control system of a conventional automatic transmission.
FIG. 4 is a diagram showing a control system for a conventional vehicle equipped with an airbag.
[Explanation of symbols]
10 airbag module 12 airbag control unit 14 A / T control unit (automatic transmission control device)
16 A / T (automatic transmission)
N Engine speed S1 Airbag activation signal S2 Transmission control signal T Oil temperature TH Throttle opening V Vehicle speed

Claims (2)

Installed in a vehicle that has an airbag, an airbag control unit that outputs an airbag activation signal when it detects that the vehicle body has received a shock greater than a predetermined value, and a plurality of detection means such as a load sensor and a vehicle speed sensor Then, by controlling driving of a plurality of electromagnetic switching means of the automatic transmission based on signals from the plurality of detecting means, each of the gear position, lock-up, and clutch oil pressure is switched, and the traveling state of the vehicle is changed. In an automatic transmission control device that performs a gear shift according to the above and achieves a predetermined gear position with a small drive torque when the electromagnetic switching means is not energized ,
The airbag control unit is configured to output the airbag activation signal to the airbag and the automatic transmission control device, respectively, and the automatic transmission control device is configured to output the airbag activation signal when the airbag activation signal is input. An automatic transmission control device for a vehicle equipped with an airbag, wherein the power supply to the electromagnetic switching means is cut off. When the power supply to the electromagnetic switching means is cut off by the input of the airbag operation signal, the automatic transmission control device sets the electromagnetic switching only when the ignition key switch is turned off and then turned on. 2. The automatic transmission control device for an airbag-equipped vehicle according to claim 1, wherein the cutoff of the power supply to the means is released.

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