US6789512B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for operating an internal combustion engine, and motor vehicle
Assignee: Mercedes Benz Group AG
•
Filing: 2002-11-08
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Granted: 2004-09-14
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Expires: 2022-11-08
Abstract
Abstract In a method for operating an internal combustion engine, and a motor vehicle to be heated by the engine coolant, wherein the internal combustion engine has a cooling circuit, a heating mode can be established in which operating parameters of the internal combustion engine, while satisfying required output set values, are set for the maximum possible introduction of heat into the coolant and the exhaust gas in order to reach or hold a desired coolant temperature.
Inventors
- 👤 Frank Duvinage
- 👤 Matthias Klingebiel
- 👤 Ruediger Pfaff
- 👤 Helko Sass
- 👤 Lothar Welte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:21
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/0025; F02D41/0047; F02D41/005; F02D41/0055; B; B60; B60H; B60H1/00; B60H1/02; F01; F01P; F01P3/00; F01P3/20; F01P7/00; F01P7/14; F01P7/16; F01P7/164; F01P7/167; F02B; F02B29/00; F02B29/04; F02B29/0406; F02B29/0437; F02B29/0443; F02D35/00; F02D35/02; F02D35/025; F02D41/02; F02D41/04; F02D41/06; F02D41/068; F02D41/08; F02D41/086; F02M; F02M26/00; F02M26/13; F02M26/22; F02M26/23; F02M26/28; F01P2025/00; F01P2025/08; F01P2025/31; F01P2025/32; F01P2025/33; F01P2025/40; F01P2037/00; F01P2037/02; F01P2060/00; F01P2060/02; F01P2060/04; F01P2060/08; F01P7/02; F01P7/10; F02D41/14; F02D41/1401; F02D2041/1413; F02D2041/1422; F02D41/0065; F02D41/30; F02D41/38; F02D41/40; F02D41/402; F02D41/405; F02M26/33; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/40
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
100 words
A method for operating an internal combustion engine which has a coolant circuit and exhaust gas re-circulation, during warm-up by switching engine operation from a normal mode to a heating mode for rapidly reaching or holding a desired coolant temperature, wherein operating parameters of the internal combustion engine, while satisfying required output values, are set for the maximum possible introduction of heat into the coolant and/or the exhaust gas, said method comprising the step of setting an exhaust-gas re-circulation rate in an exhaust-gas re-circulation device of the internal combustion engine to a maximum possible value while maintaining predetermined limit values.
Claim 2
Independent Claim
100 words
A method for operating an internal combustion engine which has a coolant circuit and exhaust gas re-circulation, during warm-up by switching engine operation from a normal mode to a heating mode for rapidly reaching or holding a desired coolant temperature, wherein operating parameters of the internal combustion engine, while satisfying required output values, are set for the maximum possible introduction of heat into the coolant and/or the exhaust gas, said method comprising the step of setting an exhaust-gas re-circulation rate in an exhaust-gas re-circulation device of the internal combustion engine to a maximum possible value while maintaining predetermined limit values.
Claim 3
Dependent Claim
40 words
A method according to claim 1 , wherein, in said heating mode, in order to increase a combustion-chamber surface temperature, combustion is temporally advanced with respect to the combustion in standard operation, while a maximum allowable combustion-chamber pressure is maintained.
Claim 4
Dependent Claim
35 words
A method according to claim 1 , wherein, in said heating mode, the combustion is delayed with respect to the combustion during normal engine operation, while predetermined limits for a combustion-chamber surface temperature are maintained.
Claim 5
Dependent Claim
33 words
A method according to claim 1 , wherein, in said heating mode, the engine idling speed is increased compared to standard operation, while the oil temperature and a the coolant temperature are monitored.
Claim 6
Dependent Claim
33 words
A method according to claim 1 , wherein, in the heating mode, flow of coolant through the internal combustion engine is set to zero for a predetermined period of time after engine startup.
Claim 7
Dependent Claim
35 words
A method according to claim 1 , wherein, in the heating mode, the coolant flow through the internal combustion engine is controlled as a function of the combustion-chamber surface temperature and the engine operating point.
Claim 8
Dependent Claim
23 words
A method according to claim 1 , wherein, in the heating mode, a radiator shutter disposed in front of the radiator is closed.
Claim 9
Dependent Claim
33 words
A method according to claim 1 , wherein, in said heating mode, an engine charging pressure of a supercharging device of the internal combustion engine is increased to increase the exhaust-gas re-circulation rate.
Claim 10
Dependent Claim
32 words
A method according to claim 8 , wherein, in the heating mode, an air flow through a charge-air cooler of said supercharging device of the internal combustion engine is set to zero.
Claim 11
Dependent Claim
40 words
A method according to claim 1 , wherein, in the heating mode, in order to shift the average combustion time with respect to standard operation, the injection quantities and/or injection times of a pre-injection, main injection and/or after-injection are changed.
Claim 12
Dependent Claim
34 words
A method according to claim 10 , wherein, in the heating mode, at least one of the fuel injection pressure and the injection duration are increased in order to increase a fuel injection quantity.
Claim 13
Dependent Claim
39 words
A method according to claim 1 , wherein with a control means for controlling the coolant temperature of the internal combustion engine, the combustion-chamber surface temperature and the oil temperature are monitored for maintaining them below a limit value.
Claim 14
Dependent Claim
37 words
A method according to claim 12 , wherein in the control means, the coolant temperature at the coolant outlet of the internal combustion engine, the combustion-chamber surface temperature and the oil temperature are prioritized in that order.
Claim 15
Dependent Claim
21 words
A method according to claim 13 , wherein the control means has at least one controller with a variable control characteristic.
Claim 16
Dependent Claim
87 words
A motor vehicle having an internal combustion engine and a heater installation for rapidly heating the interior of the vehicle, comprising means for monitoring variables which are characteristic of a heating state of the internal combustion engine and means for setting a heating mode of the internal combustion engine, in which operating parameters of the internal combustion engine, while satisfying required output set values, are set during a starting phase of the engine for a maximum possible introduction of heat into the coolant and the exhaust gas.
Claim 17
Dependent Claim
87 words
A motor vehicle having an internal combustion engine and a heater installation for rapidly heating the interior of the vehicle, comprising means for monitoring variables which are characteristic of a heating state of the internal combustion engine and means for setting a heating mode of the internal combustion engine, in which operating parameters of the internal combustion engine, while satisfying required output set values, are set during a starting phase of the engine for a maximum possible introduction of heat into the coolant and the exhaust gas.
Claim 18
Dependent Claim
25 words
A motor vehicle according to claim 15 , comprising an independently controllable coolant pump for controlling the flow of coolant independently of the engine speed.
Claim 19
Dependent Claim
50 words
A motor vehicle according to claim 15 , wherein a bypass line is provided for bypassing a coolant radiator including a mixing valve, which can be controlled by means of a central control unit for setting the respective flows of coolant through the bypass line and the cooling system radiator.
Claim 20
Dependent Claim
19 words
A motor vehicle according to claim 15 , wherein an exhaust-gas re-circulation cooler is provided in the cooling circuit.
Claim 21
Dependent Claim
25 words
A motor vehicle according to claim 18 , wherein the exhaust-gas re-circulation and a heater are connected in a series arrangement in the cooling circuit.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2007-09-14 | 2008-03-15 | 2008-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-09-14 | 2012-03-15 | 2012-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-09-14 | 2016-03-15 | 2016-09-14 | $7700.00 | Window Closed / Lapsed |