JP2581533B2 - Automatic manual switching control method of suspension hardness - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic manual switching control method for suspension hardness, and more particularly to a control method for preventing danger when switching from automatic to manual.

[Background of the Invention]

2. Description of the Related Art Conventionally, there has been known a suspension system of a vehicle having a structure in which suspension hardness can be adjusted and changed stepwise. In some cases, a switch for switching between automatic and manual is provided so that the hardness adjustment can be automatically controlled or manually adjusted. This is because when the vehicle is switched to the automatic control position, the vehicle traveling state, for example, rolling,
The detection state of the nose dive or the squat is detected, and the adjustment to harden the sunk suspension is automatically performed to prevent the occurrence of the nose dive or the squat.
When the driver is switched to the manual side, the hardness of the suspension is selected according to the driver's intention.

However, in the conventional control means, if the suspension hardness adjustment can be directly switched by an arbitrary operation of the switching switch, there is a problem that there is a danger particularly when switching to manual (manual). That is, when the automatic control is currently being performed and a hard command is output to the left suspension of the vehicle by detecting a posture control signal such as rolling, for example, the operation of switching to the manual for which the suspension should be softened is performed. In such a case, if this is allowed as it is, there is a risk that the vehicle may overturn. As described above, when the automatic manual switching switch is provided, the manual operation may be controlled only by the driver's intention irrespective of the traveling state, and thus there is an extremely high risk. Therefore, as a conventional method, there has been proposed a method in which the manual operation is restricted so that the suspension is switched only to the hardware side.However, from the viewpoint of controllability, the driver's intention is not respected, which is not preferable. Was.

[Object of the invention]

The present invention focuses on the above-mentioned conventional problems, and when enhancing the suspension hardness adjustment from automatic to manual, a suspension hardness with enhanced safety so that a dangerous hardness control instruction is not given to the suspension. It is an object of the present invention to provide an automatic manual switching control method.

[Summary of the Invention]

In order to achieve the above object, the present invention provides a method of switching a switch to an automatic control position or a manual control position,
In an automatic manual switching control method of suspension hardness for adjusting the hardness of the suspension to a value suitable for a vehicle driving condition, when the switch is switched from the automatic control position to the manual control position, the output of the attitude control signal to the suspension is controlled. If the presence / absence is detected and the output of the attitude control signal is detected, the automatic control state is continued until the output signal ends, and the switching to the manual control is waited. After the output signal ends, the switch to the manual control is performed. It is characterized by doing so.

According to the above configuration, when the vehicle suspension is at the automatic control position, that is, the automatic side, and the attitude control is performed, and when the switching operation to the manual control position, that is, the manual side is performed, the suspension is hardened during the attitude control. Therefore, it is determined that the switching operation is to be on standby. During the attitude control, contrary to the manual instruction, an auto priority is provided so as to continue the state on the auto side, and a switching operation signal can be output after the attitude control is completed. As a result, the manual switching operation is substantially performed after the danger state is avoided, so that an automatic manual switching control method of suspension hardness that is safe and excellent in controllability can be provided.

(Example of the invention)

Hereinafter, an embodiment of the automatic manual switching control method of the suspension hardness according to the present invention will be described in detail.

FIG. 1 is a control circuit for implementing the control method according to the embodiment. First, there is an automatic manual switching switch 10 for switching between an automatic control position and a manual control position with respect to the suspension. The manual contact is connected to a ground terminal and an inverter 12. This first inverter
The output terminal 12 is further connected to one input terminal of the first AND circuit 14. To the other input terminal of the first AND circuit 14,
One-shot multi 18 excited by the output of OR circuit 16
Output terminals are connected. The OR circuit 16 receives signals for controlling the vehicle attitude, such as a rolling generation signal, a squat generation signal, and a nose dive generation signal, as input signals.
A signal is output to the first AND circuit 14 through 18.

A flip-flop 20 is connected to the output side of the first AND circuit 14.
Are connected at the set input terminal. The flip-flop 20 has a terminal as an output terminal, which is connected to a second AND circuit 22 in the next stage. The reset terminal of the flip-flop 20 is connected to the manual contact of the switching switch 10. Such a flip flop
The output signal of the OR circuit 16 is input to the other input terminal of the second AND circuit 22 connected to the output terminal 20. Therefore, the output signal of flip-flop 20 is
When the output signals of the OR circuit 16 are at the same level, the second AND circuit
It is output from 22. The second AND circuit 22 is connected to a third AND circuit 26 having the output signal as one input signal via a second inverter 24. The output terminal of the first inverter 12 is connected to the other input terminal of the third AND circuit 26 via a bypass signal path.
A signal is output when both input signals to the 3AND circuit 26 are at the same level, and the output signal is used as a manual switching signal 28.

A control method using such a circuit configuration is as follows. That is, when the switch 10 provided for automatically or manually controlling the hardness of the vehicle suspension is switched from automatic to manual contact, it is determined whether or not the vehicle traveling state is currently in attitude control. This is the first AND circuit 14
Is obtained from the switching switch 10 and the OR circuit 16 which inputs the attitude control signal. In this case, in the embodiment, rolling, scout, and nose dive are listed as the posture control signals. However, the present invention is not limited to this.
What is necessary is just to input it to the OR circuit 16. If the attitude control is being performed, an output is obtained from the flip-flop 20, and the
The output of the OR circuit 16 is input to the 2AND circuit 22, and an output signal is obtained from the AND circuit 22 while the attitude control output signal is detected. Therefore, the second AND circuit 22
In, the amount of time delay until the end of the posture control state is determined.
After that, the output signal from the second AND circuit 22 is output to the second inverter
The signal is input to the third AND circuit 26 via 24, where it is confirmed that the switching has been made to the manual contact side, and the manual switching signal 28 is finally output.

FIGS. 2 (1) and 2 (2) show the signal states of the control circuit numbers shown in FIG. 1, and FIG. 2 (1) shows a case where the switching to manual can be performed immediately. 2)
Indicates the case of auto priority. First, in FIG.
The output signal of the inverter 12 becomes high level at the same time as the switching operation in response to the switching switch 10 (FIG. 3). On the other hand, the attitude control signal is not detected at the time of the manual switching operation, but is detected after the switching operation. Then (same figure),
At the time of detection, a pulse is output from the one-shot multi 18 (FIG. 3). Therefore, the output signal of the first AND circuit 14 becomes a pulse signal from the signal and the signal (the same figure), and the output of the flip-flop 20 changes from the high level to the low level. Then, the second AND circuit 22 maintains a low level from the signal and the signal (FIG. 3), and based on the input signal passed through the second inverter 24 and the signal from the first inverter 12,
The switching operation signal 28 is immediately output simultaneously with the switching operation of the switch 10.

On the other hand, in FIG. 2 (2), at the time of the manual switching operation (FIG. 2), the attitude control has already been detected (FIG. 2), and a pulse is input to the first AND circuit 14 in response to the attitude control signal. (The same figure). However, at the time of this pulse input, no manual operation is performed, so the first AND circuit 14
Maintains the low level (see FIG. 3). For this reason, the flip-flop 20 outputs a high level signal (shown in the figure), and the second AND circuit 22 receives the signals and determines the so-called time delay amount which is set to the high level from the time when the attitude control signal is detected until the time when the attitude control signal ends. Figure). Therefore,
The manual switching operation signal 28 is output with a delay T from the time of the actual switching operation until the output of the attitude control signal disappears. Here, the attitude control signal is detected, but this signal is used for automatic control, and it is necessary to harden the suspension on the sinking side in order to prevent the vehicle from sinking sideways. Switching to manual, in which the suspension is on the soft side with a time delay, is prevented during attitude control, and the attitude control is continued until the end of the attitude control.

〔The invention's effect〕

As described above, according to the present invention, the automatic operation is performed when the switching to the manual is dangerous, such as when the manual is performing the software instruction while the suspension is on the hardware side while the automatic side is in the posture control. Can be continued, and the manual operation can be performed when the dangerous state is resolved. Therefore, the control state is shifted after the safety is confirmed in the control state by the driver's intention, so that the control state is extremely safe and excellent in controllability.

[Brief description of the drawings]

FIG. 1 is a control circuit diagram used for carrying out an automatic manual switching control method of suspension hardness according to the present invention, and FIGS. 2 (1) and 2 (2) are diagrams in the course of the control circuit shown in FIG. It is a signal state diagram. 10 …… Automatic manual switching switch, 12, 24 …… Inverter,
14, 22, 26… AND circuit, 16… OR circuit, 18… One shot multi, 20… Flip flop, 28… Manual switching signal.

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukimi Tachibana 1805-1, Asamizodai, Sagamihara-shi Kayaba Industry Co., Ltd. Sagami Factory (56) References JP-A-53-18318 (JP, A) JP-A-58-122302 (JP, A) Japanese Utility Model Showa 57-109727 (JP, U) Japanese Utility Model Showa 58-152406 (JP, U) Japanese Patent Publication No. 57-26912 (JP, B2)

Claims (1)

(57) [Claims] An automatic manual switching control method for suspension hardness, wherein a switch is switched to an automatic control position or a manual control position to adjust the hardness of the suspension to a value suitable for a vehicle driving condition. When the position is switched to the manual control position, the presence / absence of an attitude control signal output to the suspension is detected. When the output of the attitude control signal is detected, the automatic control state is continued until the output signal ends, and the manual control is performed. Automatic suspension stiffness switching control method in which switching to manual control is performed after the output signal is terminated, while waiting for switching to suspension control.