Pneumatic pressure control method for vehicle seat and pneumatic pressure control device for vehicle seat

1. A pneumatic pressure control method for a vehicle seat, comprising:

repeatedly detecting an internal pressure of a bladder provided inside the vehicle seat in a state where an intake valve provided between the bladder and an air pump is opened and an exhaust valve is closed at intervals;

correcting the internal pressure of the bladder based on a differential pressure between a detection value and a target value; and

lengthening a detection interval to detect the internal pressure depending on a time elapsing from starting of the vehicle.

2. The pneumatic pressure control method according to claim 1 , wherein

the lengthening of the detection interval to detect the internal pressure includes setting the detection interval to detect the internal pressure to a first interval until a predetermined time elapses from the starting of the vehicle, and setting the detection interval to detect the internal pressure to a second interval after the predetermined time has elapsed, the second interval being longer than the first interval.

3. The pneumatic pressure control method according to claim 2 , further comprising:

detecting a vehicle interior temperature; and

recognizing that the predetermined time has elapsed when the vehicle interior temperature is stabilized.

4. The pneumatic pressure control method according to claim 2 , further comprising:

estimating a necessary time to stabilize the vehicle interior temperature after the starting of the vehicle; and

setting the necessary time thus estimated as the predetermined time.

5. The pneumatic pressure control method according to claim 1 , further comprising:

detecting a vehicle interior temperature; and

lengthening the detection interval to detect the internal pressure as a change amount of the vehicle interior temperature is smaller.

6. The pneumatic pressure control method according to claim 1 , wherein

a passage connecting the bladder to the air pump is provided with a check valve, the intake valve, the exhaust valve, and a pressure sensor, the exhaust valve and the pressure sensor being provided at respective positions between the intake valve and the check valve in the passage.

7. A pneumatic pressure control method for a vehicle seat, comprising:

repeatedly detecting an internal pressure of a bladder provided inside the vehicle seat in a state where an intake valve provided between the bladder and an air pump is opened and an exhaust valve is closed at intervals;

correcting the internal pressure of the bladder based on a differential pressure between a detection value and a target value;

detecting a vehicle interior temperature; and

lengthening a detection interval to detect the internal pressure as a change amount of the vehicle interior temperature is smaller.

8. A pneumatic pressure control device for a vehicle seat, comprising:

an internal pressure detecting portion configured to repeatedly detect an internal pressure of a bladder provided inside the vehicle seat in a state where an intake valve provided between the bladder and an air pump is opened and an exhaust valve is closed at intervals;

an internal pressure correcting portion configured to correct the internal pressure of the bladder based on a differential pressure between a detection value and a target value; and

a detection interval change portion configured to lengthen a detection interval to detect the internal pressure depending on a time elapsing from starting of the vehicle.

9. The pneumatic pressure control device according to claim 8 , wherein

the detection interval change portion includes a first interval setting portion configured to set the detection interval to detect the internal pressure to a first interval until a predetermined time elapses from the starting of the vehicle, and a second interval setting portion configured to set the detection interval to detect the internal pressure to a second interval after the predetermined time has elapsed, the second interval being longer than the first interval.

10. The pneumatic pressure control device according to claim 9 , further comprising:

a temperature detecting portion configured to detect a vehicle interior temperature; and

a predetermined-time elapse recognition portion configured to recognize that the predetermined time has elapsed when the vehicle interior temperature is stabilized.

11. The pneumatic pressure control device according to claim 9 , further comprising:

a stabilization estimation portion configured to estimate a necessary time to stabilize the vehicle interior temperature after the starting of the vehicle; and

a predetermined-time setting portion configured to set the necessary time thus estimated as the predetermined time.

12. The pneumatic pressure control device according to claim 8 , further comprising:

a temperature detecting portion configured to detect a vehicle interior temperature; and

a second detection interval change portion configured to lengthen the detection interval to detect the internal pressure as a change amount of the vehicle interior temperature is smaller.

13. A pneumatic pressure control device for a vehicle seat, comprising:

an internal pressure detecting portion configured to repeatedly detect an internal pressure of a bladder provided inside the vehicle seat in a state where an intake valve provided between the bladder and an air pump is opened and an exhaust valve is closed at intervals;

an internal pressure correcting portion configured to correct the internal pressure of the bladder based on a differential pressure between a detection value and a target value;

a temperature detecting portion configured to detect a vehicle interior temperature; and

a second detection interval change portion configured to lengthen a detection interval to detect the internal pressure as a change amount of the vehicle interior temperature is smaller.