EP0061501A1
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EP
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Dozing driver warning system
Assignee: Nissan Motor Co Ltd
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Filing: 1981-10-05
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Granted: —
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Expires: 2001-10-05
Abstract
Abstract A dozing drive warning system which has a circuit (10) for detecting right or left steering angle variations and generates pulse signals in response to the steering angle variations, circuits (30, 40) for generating an alarm signal when the counted value reaches a set value, and a circuit (60) for generating a reset signal for clearing the counted value when the difference between the pulse signals indicating the leftward steering angle variation and the pulse signals indicating the rightward steering angle variation exceed a predetermined value or when the leftward or rightward pulse signals exceed a predetermined number and are continuously being input. The reset signal generating circuit discriminates when the steering angle variation exceeds the set value regardless of the normal drive state when driving along a curved road to generate a reset signal which prevents the generation of the alarm signal. Erroneous operation of the warning system is prevented by the reset signal generating circuit.
Inventors
- 👤 Yasutoshi Seko
- 👤 Takayuki Yanagishima
- 👤 Noburu Fukasawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 13:55
CPC Classifications
G; G08; G08B; G08B21/00; G08B21/02; G08B21/06
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
145 words
1 A doze warning system comprises: a steering angle detecting means(20)for producing steering angle pulse (S 2 and S 3 )depending on the steering direction every time steering operation exceeding a predetermined angular value; a first reset signal 'generating circuit (62) counting each steering direction of steering angle pulse and producing a first reset signal (s 9 )when a difference of the counter values reaches a predetermined value within a period measured from inputting the steering angle pulse and being shorter than a given period; a warning signal generating means (30 and 40) for producing a warning signal (S 8 ) when a counter value of the steering angle pulse reaches a predetermined threshold value within said given period, which warning signal generating means is resetted in response to said first reset signal; and a warning device responsive to said warning signal to produce warning.
Claim 2
Dependent Claim
145 words
1 A doze warning system comprises: a steering angle detecting means(20)for producing steering angle pulse (S 2 and S 3 )depending on the steering direction every time steering operation exceeding a predetermined angular value; a first reset signal 'generating circuit (62) counting each steering direction of steering angle pulse and producing a first reset signal (s 9 )when a difference of the counter values reaches a predetermined value within a period measured from inputting the steering angle pulse and being shorter than a given period; a warning signal generating means (30 and 40) for producing a warning signal (S 8 ) when a counter value of the steering angle pulse reaches a predetermined threshold value within said given period, which warning signal generating means is resetted in response to said first reset signal; and a warning device responsive to said warning signal to produce warning.
Claim 3
Dependent Claim
193 words
2 . A doze warning system, comprising: a steering angle detecting means(2g)for producing steering angle pulse(S 2 and S 3 ) depending on the steering direction every time steering operation exceeding a predetermined angular value; a first reset signal generating circuit (62) .counting each steering direction of steering angle pulse and producing a first reset signal (S 9 ) when a difference of counter values reaches a predetermined value within a period measured from inputting of the steering angle pulse and being shorter than a given period; a second reset signal generating circuit (64) and 66 for producing second reset signal (S 10 and S 12 ) when either of left- or right-hand steering angle pulse reaches a predetermined value; a warning signal generating means (30, 40) for producing a warning signal(S 8 ) when a counter value of the steering angle pulse reaches a predetermined threshold value within said given period, which warning signal generating means is resetted in response to one of said reset signal S 9 and said reset signal(S 10 and S 12 ); and a warning device (50) for producing a warning in response to the warning signal.
Claim 4
Dependent Claim
193 words
2 . A doze warning system, comprising: a steering angle detecting means(2g)for producing steering angle pulse(S 2 and S 3 ) depending on the steering direction every time steering operation exceeding a predetermined angular value; a first reset signal generating circuit (62) .counting each steering direction of steering angle pulse and producing a first reset signal (S 9 ) when a difference of counter values reaches a predetermined value within a period measured from inputting of the steering angle pulse and being shorter than a given period; a second reset signal generating circuit (64) and 66 for producing second reset signal (S 10 and S 12 ) when either of left- or right-hand steering angle pulse reaches a predetermined value; a warning signal generating means (30, 40) for producing a warning signal(S 8 ) when a counter value of the steering angle pulse reaches a predetermined threshold value within said given period, which warning signal generating means is resetted in response to one of said reset signal S 9 and said reset signal(S 10 and S 12 ); and a warning device (50) for producing a warning in response to the warning signal.
Claim 5
Dependent Claim
52 words
The system as set forth in claim 1 or 2, wherein said first reset signal generating circuit includes an up/down counter (624) which counts up steering angle pulse representative of one direction of steering angle variation and counts down the steering angle pulse representative of the other direction of steering angle variation.
Claim 6
Dependent Claim
138 words
The system as set forth in claim 1, wherein the warning signal generating means comprises a counter circuit (30), including a counter (341) for counting up the steering angle pulse and a time setting circuit for operating said counter for said given period and producing a pulse signal (S 7 ) at the end of the given period, and a warning signal generating circuit (40) responsive to a counter signal (S 5 ) produced when the counter value of said counter reaches the predetermined threshold value to turn on and responsive to said first reset signal (S 9 ) or said second reset signal (S 10 ) and (S 12 ) to turn off, said warning signal generating circuit produces a warning signal(58)when said pulse signal (S 7 ) is inputted while it is maintained at on position.
Claim 7
Dependent Claim
130 words
5 . The system as set forth in claim 2, wherein the warning signal generating means comprises a counter circuit (30) including a counter (341) for counting up the steering angle pulse and a time setting circuit for operating said counter for said given period and producing a pulse signal (S 7 ) at the end of the given period, and a warning signal generating circuit (40) responsive to a counter signal (S 5 ) produced when the counter value of said counter reaches the predetermined threshold value to turn on and responsive to said first reset signal(S 9 ) to turn off, said warning signal generating circuit produces a warning signal(S 8 ) when said pulse sianal (S 7 ) is inputted while it is maintained at on position.
Claim 8
Dependent Claim
108 words
A doze warning system comprises: a steering angle detecting means for detecting steering angle variation and producing a first signal (S 2 ) and (S 3 ) depending on the detected steering angle variation; a warning signal generating means for counting up said first signal within a given period and producing a warning signal (S 8 ) when the counter value reaches a predetermined threshold value; a reset signal generating means for detecting one direction of steering angle variation exceeding a given value and producing a reset signal (S 14 ) according to the detection; and a warning device (50) responsive to said warning signal to produce warning.
Claim 9
Dependent Claim
108 words
A doze warning system comprises: a steering angle detecting means for detecting steering angle variation and producing a first signal (S 2 ) and (S 3 ) depending on the detected steering angle variation; a warning signal generating means for counting up said first signal within a given period and producing a warning signal (S 8 ) when the counter value reaches a predetermined threshold value; a reset signal generating means for detecting one direction of steering angle variation exceeding a given value and producing a reset signal (S 14 ) according to the detection; and a warning device (50) responsive to said warning signal to produce warning.
Claim 10
Dependent Claim
72 words
The system as set forth in claim 6, wherein said warning signal generating means comprises a counter circuit (30) for counting up said first signal (S 1 and S 2 ) and producing a second signal when the counter value exceeds said predetermined threshold value and a warning signal generating circuit (40) being set in response to said second signal and being reset in response to said reset signal (S 14 ).
Claim 11
Dependent Claim
90 words
The system as set forth in claim 6 or 7, wherein said reset signal generating means (60) includes an up/down counter (624) which counts up the first signal (S 2 ) produced in response to the first direction of steering operation and counts down the first signal (S 3 ) in response to the second direction of steering operation, which second direction is different from said first direction, and produces the reset signal (S 14 ) when the counter value becomes equal to a value corresponding to a predetermined angle.
Claim 12
Dependent Claim
122 words
9 . The system as set forth in claim 8, wherein said reset signal generating means includes a first counter(642) for counting up the first signal indicative of first direction of steering angle variation and producing said reset signal (S14) when the counter value reaches a predetermined value, which first counter is reset in response to the first signal (S 3 ) indicative of the second direction of steering angle variation, and a second counter for counting up the first signal (S 3 ) of the second direction and producing said reset signal (S 14 ) when the counter value reaches the predetermined value, which second counter is reset in response to the first signal (S 2 ) of the first direction.
Claim 13
Dependent Claim
69 words
The system as set forth in claim 7, wherein said counter circuit (30) includes a time setting section (38) for defining said period for counting said first signal and producing a pulse signal (S 7 ) at the end of said period, and said warning signal generating circuit(40)is responsive to sand pulse signal (S 7 ) while it is set in response to said second signal (S 5 ).
Claim 14
Independent Claim
81 words
A method for warning dozing at wheel comprises: detecting steering angle variation within a given period; producing warning at a predetermined timing when the detected steering angle variation reaches a predetermined threshold value; determining a' difference of the steering angle variation in a first direction and steering angle variation in a second direction; and clearing said detected value to inhibiting producing of warning when the difference of the steering angle variations in the first and second directions reaches a predetermined value.
Claim 15
Independent Claim
81 words
A method for warning dozing at wheel comprises: detecting steering angle variation within a given period; producing warning at a predetermined timing when the detected steering angle variation reaches a predetermined threshold value; determining a' difference of the steering angle variation in a first direction and steering angle variation in a second direction; and clearing said detected value to inhibiting producing of warning when the difference of the steering angle variations in the first and second directions reaches a predetermined value.
Claim 16
Dependent Claim
56 words
The method as set forth in claim 11, which further comprises a step for providing a predetermined period of delay time after the detected value reaches said predetermined threshold value to produce the warning and inhibiting producing of warning when the difference of the steering angle variations in first and second directions reaches said predetermined value.
References Cited (Backward Citations)
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