State of charge catalyst heating strategy
First Claim
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1. An engine system, comprising:
- a heater for heating a catalytic converter in an exhaust system of a vehicle;
a first electronic circuit configured to receive a parameter associated with a battery in said vehicle and determines a state of charge of said battery based on said parameter; and
a second electronic circuit configured to;
activate said heater when said state of charge is less than a first state of charge threshold; and
determine said first state of charge threshold based on a volume of said catalytic converter and a measured temperature of an engine in said vehicle, wherein said measured temperature is measured during operation of said vehicle when said engine is off and an electric motor in said vehicle is being used to produce drive torque; and
a third electronic circuit configured to start said engine when said state of charge is less than a second state of charge threshold and said measured temperature of said engine is less than an operating temperature, wherein said second electronic circuit determines at least one of said first and second state of charge thresholds such that sufficient power is available to increase a temperature of said catalytic converter to an activation temperature using said heater and to continue to activate said heater while said measured temperature of said engine is less than said operating temperature.
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Abstract
A control system includes a state of charge module and a control module. The state of charge module receives a parameter associated with a battery in a vehicle and determines a state of charge of the battery based on the parameter. The control module activates a heater in a catalytic converter in an exhaust system of the vehicle based on the state of charge.
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Citations
21 Claims
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1. An engine system, comprising:
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a heater for heating a catalytic converter in an exhaust system of a vehicle; a first electronic circuit configured to receive a parameter associated with a battery in said vehicle and determines a state of charge of said battery based on said parameter; and a second electronic circuit configured to; activate said heater when said state of charge is less than a first state of charge threshold; and determine said first state of charge threshold based on a volume of said catalytic converter and a measured temperature of an engine in said vehicle, wherein said measured temperature is measured during operation of said vehicle when said engine is off and an electric motor in said vehicle is being used to produce drive torque; and a third electronic circuit configured to start said engine when said state of charge is less than a second state of charge threshold and said measured temperature of said engine is less than an operating temperature, wherein said second electronic circuit determines at least one of said first and second state of charge thresholds such that sufficient power is available to increase a temperature of said catalytic converter to an activation temperature using said heater and to continue to activate said heater while said measured temperature of said engine is less than said operating temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method, comprising:
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receiving a parameter associated with a battery in a vehicle and determining a state of charge of said battery based on said parameter; determining a first state of charge threshold based on a volume of a catalytic converter in an exhaust system of said vehicle and a measured temperature of an engine in said vehicle, wherein said measured temperature is measured during operation of said vehicle when said engine is off and an electric motor in said vehicle is being used to produce drive torque; activating a heater in said catalytic converter and thereby heating said catalytic converter when said state of charge is less than said first state of charge threshold; starting said engine when said state of charge is less than a second state of charge threshold and said measured temperature of said engine is less than an operating temperature; and determining at least one of said first and second state of charge thresholds such that sufficient power is available to increase a temperature of said catalytic converter to an activation temperature using said heater and to continue to activate said heater while said measured temperature of said engine is less than said operating temperature. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification