IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0622139
(2003-07-18)
|
우선권정보 |
DE-0033049 (2002-07-19) |
발명자
/ 주소 |
- B?cker, Christian
- H?glmaier, Werner
- Wolf, Felix
|
출원인 / 주소 |
- Webasto Thermosysteme International GmbH
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
5 |
초록
▼
A heater in which, during the glow plug ramp time interval, the amount of energy supplied per unit of time to the glow plug/flame monitor can be successively changed, and a control unit which is operationally coupled to the glow plug/flame monitor. To enable continuous flame monitoring during the st
A heater in which, during the glow plug ramp time interval, the amount of energy supplied per unit of time to the glow plug/flame monitor can be successively changed, and a control unit which is operationally coupled to the glow plug/flame monitor. To enable continuous flame monitoring during the starting phase of the heater with the control unit, the resistance value of the glow plug/flame monitor is determined during the glow plug ramp time interval and compared to a threshold value RGS, and when the threshold value RGS is not reached, a flame-out signal is generated.
대표청구항
▼
1. A heater comprising,a glow plug or flame monitor in which, during a glow plug ramp time interval, the amount of energy supplied per unit of time is successively changable, and a control unit which is operationally coupled to the glow plug or flame monitor, wherein the control unit is operative fo
1. A heater comprising,a glow plug or flame monitor in which, during a glow plug ramp time interval, the amount of energy supplied per unit of time is successively changable, and a control unit which is operationally coupled to the glow plug or flame monitor, wherein the control unit is operative for determining a resistance value of the glow plug or flame monitor during the glow plug ramp time interval, for comparing the resistance value determined to a threshold value RGS, and for generating a flame-out signal when the threshold value RGS is not reached during the glow plug ramp time interval. 2. The heater as claimed in claim 1, wherein the threshold value RGS changed in accordance with a function RGS=f(t) in dependence on a time t during the glow plug ramp time interval.3. The heater as claimed in claim 2, wherein the function is determined depending on a resistance value Rstart of the glow plug or flame monitor at the start of the glow plug ramp time interval.4. The heater as claimed in claim 2, wherein the function is determined by a characteristic of the resistance value that is linear between a resistance value Rstart of the glow plug or flame monitor at the start of the glow plug ramp time interval and a resistance value Rend of the glow plug or flame monitor at the end of the glow plug ramp time interval where RGS=f(t; Rstart; Rend).5. The heater as claimed in claim 4, wherein the function is further determined by an offset to provide the characteristic.6. The heater as claimed in claim 5, wherein the offset is a function offset Y such that the function is determined as RGS=f(t; Rstart; Rend)?Y.7. The heater as claimed in claim 5, wherein the offset is one of offset values A and B, each being function-determining resistance values such that the function is determined as RGS=t*(A*Rstart?B*Rend).8. The heater as claimed in claim 4, wherein the resistance value Rend of the glow plug is either experimentally determined at the end in the glow plug ramp time interval or is determined as a function of the resistance value Rstart of the glow plug at the start of the ramp time interval such that Rend=f(Rstart).9. The heater as claimed in claim 7, wherein the function is determined as RGS=f(t; A*Rstart; B*Rend), with Rend=f(Rstart).10. The heater as claimed in claim 2, wherein the function is determined by a characteristic of the resistance value that is linear between the resistance value Rstart of the glow plug or flame monitor at the start of the glow plug ramp time interval and the resistance value Rend of the glow plug or flame monitor at the end of the glow plug ramp time interval where RGS=t*(Rstart?Rend)/ttotal.11. The heater as claimed in claim 10, wherein the function is further determined by an offset to provide the characteristic.12. The heater as claimed in claim 11, wherein the offset is a function offset Y such that the function is determined as RGS=t*(Rstart?Rend)/ttotal?Y.13. The heater as claimed in claim 4, wherein the resistance value Rend of the glow plug is determined as a function of the resistance value Rstart of the glow plug at the start of the ramp time interval such that Rend=X*Rstart where X is a numerical value.14. The heater as claimed in claim 7, wherein the function is determined as RGS=t*(A*Rstart?B*x Rend)/ttotal, with Rend=f(Rstart).15. A motor vehicle including a heater, the heater comprising,a glow plug or flame monitor in which, during a glow plug ramp time interval, the amount of energy supplied per unit of time is successively changable, and a control unit which is operationally coupled to the glow plug or flame monitor, wherein the control unit is operative for determining a resistance value of the glow plug or flame monitor during the glow plug ramp time interval, for comparing the resistance value determined to a threshold value RGS, and for generating a flame-out signal when the threshold value RGS is not reached during the glow plug ramp time interval. 16. A motor vehicle including the heater set forth in claim 15, wherein the threshold value RGS changed in accordance with a function RGS=f(t) in dependence on a time t during the glow plug ramp time interval.17. A motor vehicle including the heater set forth in claim 16, wherein the function is determined by a characteristic of the resistance value that is linear between a resistance value Rstart of the glow plug or flame monitor at the start of the glow plug ramp time interval and a resistance value Rend of the glow plug or flame monitor at the end of the glow plug ramp time interval where RGS=f(t; Rstart; Rend).18. A motor vehicle including the heater set forth in claim 17, wherein the function is further determined by a function offset Y such that the function is determined as RGS=f(t; Rstart; Rend)?Y.19. A motor vehicle including the heater set forth in claim 18, wherein the resistance value Rend of the glow plug is either experimentally determined at the end in the glow plug ramp time interval or is determined as a function of the resistance value Rstart of the glow plug at the start of the ramp time interval such that Rend=f(Rstart).
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