Hybrid catalyst convective preheating system
First Claim
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1. A catalyst heating system comprising:
- a first electronic circuit configured to monitor at least one of (i) a first temperature of a non-electrically heated catalyst (EHC) of a catalyst assembly in an exhaust system of an engine and (ii) an active catalyst volume of the catalyst assembly;
a second electronic circuit configured to select an EHC heating mode and generate a mode signal based on the at least one of the first temperature and the active catalyst volume;
a third electronic circuit configured to control current to an EHC of the catalyst assembly based on the mode signal;
a fourth electronic circuit configured to monitor a second temperature of the EHC; and
a fifth electronic circuit configured to compare the second temperature to an EHC convection temperature and generate a first comparison signal,wherein the EHC convection temperature is a predetermined amount greater than a predetermined non-EHC convection temperature,wherein the second electronic circuit is configured to, while current is supplied to the EHC, select an air pumping mode to prevent the first temperature from exceeding the predetermined non-EHC convection temperature, andwherein the air pumping mode includes at least one of (i) rotating a crankshaft of the engine while the engine is deactivated, and (ii) activating an air pump.
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Abstract
A catalyst heating system includes a monitoring module, a mode selection module and an electrically heated catalyst (EHC) control module. The monitoring module monitors at least one of (i) a first temperature of a non-EHC of a catalyst assembly in an exhaust system of an engine and (ii) an active catalyst volume of the catalyst assembly. The mode selection module is configured to select an EHC heating mode and generate a mode signal based on the at least one of the first temperature and the active catalyst volume. The EHC control module controls current to an EHC of the catalyst assembly based on the mode signal.
16 Citations
17 Claims
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1. A catalyst heating system comprising:
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a first electronic circuit configured to monitor at least one of (i) a first temperature of a non-electrically heated catalyst (EHC) of a catalyst assembly in an exhaust system of an engine and (ii) an active catalyst volume of the catalyst assembly; a second electronic circuit configured to select an EHC heating mode and generate a mode signal based on the at least one of the first temperature and the active catalyst volume; a third electronic circuit configured to control current to an EHC of the catalyst assembly based on the mode signal; a fourth electronic circuit configured to monitor a second temperature of the EHC; and a fifth electronic circuit configured to compare the second temperature to an EHC convection temperature and generate a first comparison signal, wherein the EHC convection temperature is a predetermined amount greater than a predetermined non-EHC convection temperature, wherein the second electronic circuit is configured to, while current is supplied to the EHC, select an air pumping mode to prevent the first temperature from exceeding the predetermined non-EHC convection temperature, and wherein the air pumping mode includes at least one of (i) rotating a crankshaft of the engine while the engine is deactivated, and (ii) activating an air pump. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 16, 17)
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11. A catalyst heating system comprising:
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a first electronic circuit configured to monitor a first temperature of a non-electrically heated catalyst (EHC) of a catalyst assembly in an exhaust system of an engine; a second electronic circuit configured to monitor a second temperature of an EHC of the catalyst assembly; a third electronic circuit configured to select an engine speed maintaining mode and an air pumping mode and generate a mode signal based on the first temperature and the second temperature; a fourth electronic circuit configured to initiate at least one pumping action to pump air into an inlet of the catalyst assembly during the air pumping mode, wherein the at least one pumping action includes (i) rotating a crankshaft of the engine when the engine is deactivated and (ii) activating an air pump; and a fifth electronic circuit configured to compare the second temperature to a maximum EHC convection temperature and generate a first comparison signal, wherein the third electronic circuit is configured to select the air pumping mode if the first comparison signal indicates the second temperature being greater than the maximum EHC convection temperature, and wherein the third electronic circuit is configured to select the engine speed maintaining mode if the first comparison signal indicates the second temperature being less than or equal to the maximum EHC convection temperature. - View Dependent Claims (12, 13)
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14. A method of operating a catalyst heating system comprising:
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monitoring at least one of (i) a first temperature of a non-electrically heated catalyst (EHC) of a catalyst assembly in an exhaust system of an engine and (ii) an active catalyst volume of the catalyst assembly; selecting an EHC heating mode and generating a mode signal based on the at least one of the first temperature and the active catalyst volume; and controlling current to an EHC of the catalyst assembly based on the mode signal; monitoring a second temperature of the EHC; generating the mode signal based on the second temperature; comparing the second temperature to a maximum EHC convection temperature and generating a second comparison signal; selecting an air pumping mode if the second comparison signal indicates the second temperature being greater than the maximum EHC convection temperature; during the air pumping mode, initiating at least one pumping action to pump air into an inlet of the catalyst assembly; and selecting an engine speed maintaining mode if the second comparison signal indicates that the second temperature is less than or equal to the maximum EHC convection temperature. - View Dependent Claims (15)
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Specification