Internal combustion engine and exhaust-gas-component estimating method
AssigneeIsuzu Motors Limited
InventorShigeru HIGASHIYAMA
Life of this patent
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Abstract
An internal combustion engine, which includes a collection device that is arranged in an exhaust pipe through which an exhaust gas emitted from a cylinder passes and collects PM contained in the exhaust gas and an NOx sensor that is arranged on an upstream side of the collection device and detects an NOx content in the exhaust gas, includes: an estimating device which estimates a PM content in the exhaust gas at the upstream side of the collection device from a detection value of the NOx sensor, based on a trade-off relation between an NOx emission amount and a PM emission amount from the cylinder.
Claims6
An internal combustion engine, which includes a collection device that is arranged in an exhaust pipe through which an exhaust gas emitted from a cylinder passes and collects PM contained in the exhaust gas and an NOx sensor that is arranged on an upstream side of the collection device and detects an NOx content in the exhaust gas, comprising:
- an estimating device which estimates a PM content in the exhaust gas at the upstream side of the collection device from a detection value of the NOx sensor, based on a trade-off relation between an NOx emission amount and a PM emission amount from the cylinder.
An exhaust-gas-component estimating method which estimates a PM content in an exhaust gas at an upstream side of a collection device which is arranged in an exhaust pipe, through which the exhaust gas emitted from a cylinder of an internal combustion engine passes, and collects the PM contained in the exhaust gas, the method comprising:
- detecting an NOx content in the exhaust gas at the upstream side of the collection device using an NOx sensor arranged on the upstream side of the collection device;
- and
- estimating the PM content in the exhaust gas at the upstream side of the collection device from the detected NOx content, based on an NOx emission amount from the cylinder and a trade-off relation with a PM emission amount.
Dependencies are inferred from the claim text.