Method of discriminating object on seat

• US 20050071062A1
• Filed: 07/21/2004
• Published: 03/31/2005
• Est. Priority Date: 09/30/2003
• Status: Active Grant

• Current Assignee: Joyson Safety Systems Japan GK
• Original Assignee: Takata Corporation (Ningbo Junsheng Investment Group Co., Ltd.)
• Inventors: Azuma, Junji, Mita, Hirofumi, Takao, Masato
• Granted Patent: US 7,120,526 B2
• Time in Patent Office: Days
• US Class Current: 701/45
• CPC Class Codes: B60R 21/01516 using force or pressure sensing means

Abstract

A method of discriminating the state of an object on a vehicle seat. The method includes taking samples of a signal indicative of seat load. It is provisionally determined that the object is in a second state if the seat load exceeds a first threshold, and it is provisionally determined that the object is in a first state if the seat load is less than a second threshold. It is determined that the object is in the first state if it is provisionally determined that the object is in the first state and if it is not provisionally determined that the object is in the second state. It is determined that the object is in the second state if it is provisionally determined that the object is in the second state and if it is not provisionally determined that the object is in the first state.

Claims

1. A method of discriminating the state of an object on a vehicle seat, comprising the steps of:

taking a predetermined number of samples of a signal indicative of seat load;

provisionally determining that the state of the object is a second state if the taken samples indicate that the seat load exceeds a first load threshold in a manner that meets a first predetermined condition;

provisionally determining that the state of the object is a first state if the taken samples indicate that the seat load is less than a second load threshold in a manner that meets a second predetermined condition the same as or different than the first predetermined condition, wherein the second load threshold is higher than the first load threshold, and wherein the first state corresponds at least to a first range of seat loads and the second state corresponds to a second range of seat loads, the second range of seat loads including loads that are higher than the loads of the first range of seat loads; and

discriminating the state of the object to be the first state or the second state, wherein the state of the object is discriminated;

to be the first state if it is provisionally determined that the state of the object is the first state and if it is not provisionally determined that the state of the object is the second state; and

to be the second state if it is provisionally determined that the state of the object is the second state and if it is not provisionally determined that the state of the object is a first state.

2. The method of claim 1, further comprising:

identifying the first state or the second state as having priority;

discriminating the state of the object to be the first state if the first state has priority and if it is provisionally determined that the state of the object is the first state and the second state; and

discriminating the state of the object to be the second state if the second state has priority and if it is provisionally determined that the state of the object is the first state and the second state.

3. The method of claim 1, wherein the first predetermined condition is that a number of samples out of the predetermined taken number of samples meets or exceeds a first predetermined value, and wherein the second predetermined condition is that a number of samples out of the predetermined taken number of samples meets or exceeds a second predetermined value.

4. The method of claim 3, wherein the first predetermined value is a number that is less than the second predetermined value.

8. A method of discriminating the state of an object on a vehicle seat at a second time, comprising:

serially discriminating the state of the object according to the method of claim 2 a plurality of times including a second time and a first time serially immediately before the first time, wherein identifying the first state or the second state as having priority includes;

identifying the first state as having priority if the object was discriminated to be the first state at the first time; and

identifying the second state as having priority if the object was discriminated to be the second state at the second time.

9. The method of claim 1, further comprising:

provisionally determining that the state of the object is a third state if the taken samples indicate that the seat load exceeds a third load threshold in a manner that meets a third predetermined condition the same as or different than the first predetermined condition or the second predetermined condition, wherein the third load threshold is higher than the first load threshold and the second load threshold, and wherein the third state corresponds at least to a third range of seat loads, the third range of seat loads including loads that are higher than the loads of the first range of seat loads and the second range of seat loads; and

discriminating the state of the object to be the third state if it is provisionally determined that the state of the object is the third state and if it is not provisionally determined that the state of the object is the second state or the first state.

10. A method of discriminating the state of an object on a vehicle seat at a second time, comprising:

serially discriminating the state of the object according to the method of claim 9 a plurality of times including a second time and a first time serially immediately before the first time;

discriminating the state of the object to be the first state if it is provisionally determined that the state of the object is the first state and the second state if the object was discriminated to be the third state at the first time; and

discriminating the state of the object to be the third state if it is provisionally determined that the state of the object is the second state and the third state if the object was discriminated to be the third state at the first time.

11. The method of claim 2, wherein the first state has priority.

12. A method of determining the occupancy status of a vehicle seat, comprising:

discriminating the state of an object according to claim 1;

and

determining that the seat is vacant if the state of the object is discriminated to be the first state.

13. A method of determining the occupancy status of a vehicle seat, comprising:

discriminating the state of an object according to claim 1;

determining that the seat is vacant if the state of the object is discriminated to be the first state; and

determining that the seat is not vacant if the state of the object is discriminated to be the second state.

14. The method of claim 13, further comprising:

setting a deployment setting on an airbag deployment device to deploy in one or more deployment modes or to not deploy based on at least one of the determination that the seat is vacant and the determination that the seat is not vacant.

15. A method of determining the occupancy status of a vehicle seat, comprising:

discriminating the state of an object according to claim 9;

and

setting a deployment setting on an airbag device according to the following modes;

to not deploy if the state of the object is discriminated to be the first state;

to deploy in a soft-deployment mode if the state of the object is discriminated to be the second state; and

to deploy in a normal deployment mode if the state of the object is discriminated to be the third state.

16. The method of claim 1, wherein the seat load comprises the weight of the seat and the object on the vehicle seat.

17. The method of claim 1, wherein the seat load comprises the weight of the object on the vehicle seat and not the weight of the seat.

5. A method of discriminating the state of an object on a vehicle seat, comprising:

taking a predetermined number samples of a signal and/or signals indicative of seat load;

provisionally determining that the state of the object is a second state if the taken samples indicate that the seat load exceeds a first load threshold in a manner that meets a first predetermined condition;

provisionally determining that the state of the object is a first state if the taken samples indicate that the seat load underruns a second load threshold in a manner that meets a second predetermined condition the same as or different than the first predetermined condition, wherein the second load threshold is higher than the first load threshold, and wherein the first state corresponds at least to a first range of seat loads and the second state corresponds to a second range of seat loads, the second range of seat loads including loads that are higher than the loads of the first range of seat loads;

identifying the first state or the second state as having priority;

discriminating the state of the object to be the first state if the first state is identified as having priority and if it is provisionally determined that the state of the object is the first state before it is provisionally determined that the state of the object is the second state while taking samples; and

discriminating the state of the object to be the second state if the second state is identified as having priority and if it is provisionally determined that the state of the object is the second state before it is provisionally determined that the state of the object is the first state while taking samples.

6. The method of claim 5, wherein the first predetermined condition is that a number of samples out of the predetermined taken number of samples meets or exceeds a first predetermined value, and wherein the second predetermined condition is that a number of samples out of the predetermined taken number of samples meets or exceeds a second predetermined value.

7. The method of claim 5, wherein:

the first predetermined condition is that m×

i samples exceed the first threshold n×

i times, wherein m, i and n are natural numbers and wherein m>

n; and

wherein the second predetermined condition is that m×

k samples underrun the second threshold by n×

k times, wherein k is a natural number.

18. An apparatus for discriminating the state of an object on a vehicle seat, comprising:

a seat weight sensing system;

a controller configured to receive input signals from the seat weight sensing system indicative of a seat load and configured to take a predetermined number of samples of one or more signals;

wherein the controller is configured to;

provisionally determine that the state of the object is a second state if the taken samples indicate that the seat load exceeds a first load threshold in a manner that meets a first predetermined condition;

provisionally determine that the state of the object is a first state if the taken samples indicate that the seat load is less than a second load threshold in a manner that meets a second predetermined condition the same as or different than the first predetermined condition, wherein the second load threshold is higher than the first load threshold, and wherein the first state corresponds at least to a first range of seat loads and the second state corresponds to a second range of seat loads, the second range of seat loads including loads that are higher than the loads of the first range of seat loads;

discriminate the state of the object to be the first state if it is provisionally determined that the state of the object is the first state and if it is not provisionally determined that the state of the object is the second state; and

discriminate the state of the object to be the second state if it is provisionally determined that the state of the object is the second state and if it is not provisionally determined that the state of the object is a first state.

19. The apparatus of claim 18, wherein the controller includes is configured to:

identify the first state or the second state as having priority;

discriminate the state of the object to be the first state if the first state has priority and if it is provisionally determined that the state of the object is the first state and the second state; and

discriminate the state of the object to be the second state if the second state has priority and if it is provisionally determined that the state of the object is the first state and the second state.

20. The apparatus of claim 18, wherein the controller is programmed so that the first predetermined condition is that a number of samples out of the predetermined taken number of samples meets or exceeds a first predetermined value, and that the second predetermined condition is that a number of samples out of the predetermined taken number of samples meets or exceeds a second predetermined value.

21. The apparatus of claim 18, wherein the controller is adapted to output a signal to an airbag device to set a deployment setting on the airbag device according to the following modes:

to not deploy if the state of the object is discriminated to be the first state;

to deploy in a soft-deployment mode if the state of the object is discriminated to be the second state; and

to deploy in a normal deployment mode if the state of the object is discriminated to be the third state.

22. The apparatus of claim 21, further comprising the airbag device, wherein the airbag device is in electrical communication with the controller.

23. An apparatus for discriminating the state of an object on a vehicle seat, comprising:

a controller adapted to receive input signals from a seat load meter indicative of a seat load and to take a predetermined number of samples of one or more signals;

wherein the controller is configured to;

provisionally determine that the state of the object is a second state if the taken samples indicate that the seat load exceeds a first load threshold in a manner that meets a first predetermined condition;

provisionally determine that the state of the object is a first state if the taken samples indicate that the seat load is less than a second load threshold in a manner that meets a second predetermined condition the same as or different than the first predetermined condition, wherein the second load threshold is higher than the first load threshold, and wherein the first state corresponds at least to a first range of seat loads and the second state corresponds to a second range of seat loads, the second range of seat loads including loads that are higher than the loads of the first range of seat loads;

identify the first state or the second state as having priority;

discriminate the state of the object to be the first state if the first state is identified as having priority and if it is provisionally determined that the state of the object is the first state before it is provisionally determined that the state of the object is the second state while taking samples; and

discriminate the state of the object to be the second state if the second state is identified as having priority and if it is provisionally determined that the state of the object is the second state before it is provisionally determined that the state of the object is the first state while taking samples.

24. The apparatus of claim 23, wherein the controller is configured so that the first predetermined condition is that a number of samples out of the predetermined taken number of samples meets or exceeds a first predetermined value, and that the second predetermined condition is that a number of samples out of the predetermined taken number of samples meets or exceeds a second predetermined value.

25. The apparatus of claim 24, wherein the controller is configured to:

provisionally determine that the state of the object is a third state if the taken samples indicate that the seat load exceeds a third load threshold in a manner that meets a third predetermined condition the same as or different than the first predetermined condition or the second predetermined condition, wherein the third load threshold is higher than the first load threshold and the second load threshold, and wherein the third state corresponds at least to a third range of seat loads, the third range of seat loads including loads that are higher than the loads of the first range of seat loads and the second range of seat loads; and

discriminate the state of the object to be the third state if it is provisionally determined that the state of the object is the third state and if it is not provisionally determined that the state of the object is the second state or the first state.

26. The apparatus of claim 23, further comprising the airbag device, wherein the controller is adapted to output a signal to an airbag device to set a deployment setting on the airbag device according to the following modes:

to not deploy if the state of the object is discriminated to be the first state;

to deploy in a soft-deployment mode if the state of the object is discriminated to be the second state; and

to deploy in a normal deployment mode if the state of the object is discriminated to be the third state;

wherein

the airbag device is in electrical communication with the controller.

27. An apparatus for discriminating the state of an object on a vehicle seat, comprising:

a controller adapted to receive input signals from a seat load meter indicative of a seat load and to take a predetermined number of samples of one or more signals;

wherein the controller is configured to;

provisionally determine that the state of the object is a second state if the taken samples indicate that the seat load exceeds a first load threshold in a manner that meets a first predetermined condition;

provisionally determine that the state of the object is a first state if the taken samples indicate that the seat load underruns a second load threshold in a manner that meets a second predetermined condition the same as or different than the first predetermined condition, wherein the second load threshold is higher than the first load threshold, and wherein the first state corresponds at least to a first range of seat loads and the second state corresponds to a second range of seat loads, the second range of seat loads including loads that are higher than the loads of the first range of seat loads;

provisionally determine that the state of the object is a third state if the taken samples indicate that the seat load exceeds a third load threshold in a manner that meets a third predetermined condition the same as or different than the first predetermined condition or the second predetermined condition, wherein the third load threshold is higher than the first load threshold and the second load threshold, and wherein the third state corresponds at least to a third range of seat loads, the third range of seat loads including loads that are higher than the loads of the first range of seat loads and the second range of seat loads;

identify priorities for the first state, the second state or the third state, wherein only one state has a highest priority;

discriminate the state of the object to be the first state if the first state is identified as having the highest priority and if it is provisionally determined that the state of the object is the first state before it is provisionally determined that the state of the object is the second state while taking samples; and

discriminate the state of the object to be the second state if the second state is identified as having the highest priority and if it is provisionally determined that the state of the object is the second state before it is provisionally determined that the state of the object is the first state while taking samples.

discriminate the state of the object to be the third state if the third state is identified as having the highest priority and if it is provisionally determined that the state of the object is the second state before it is provisionally determined that the state of the object is the first state while taking samples;

wherein the controller is programmed so that the first predetermined condition is that a number of samples out of the predetermined taken number of samples meets or exceeds a first predetermined value, and that the second predetermined condition is that a number of samples out of the predetermined taken number of samples meets or exceeds a second predetermined value, and that the third predetermined condition is that a number of samples out of the predetermined taken number of samples meets or exceeds a second predetermined value.