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AssigneeToyota Jidosha Kabushiki Kaisha
InventorsTakahide Izutani, Hidemi Onaka, Koji Morita
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A trouble-detection apparatus for an EGR system provided with an EGR control valve in an EGR passage, capable of correctly detecting a position in the EGR passage at which the clogging has occurred. The trouble-detection apparatus is applied to the system having the EGR control valve controlled by a negative pressure in the EGR passage wherein a lift amount of the EGR control valve is controlled by a lift sensor in a feedback manner in accordance with the operating state of the engine. According to the trouble-detection apparatus, the amplitude of the lift amount detected by the lift sensor is obtained and the pulses in the exhaust-gas flow are calculated from the detected amplitude. When the amplitude of the pulses in the exhaust-gas flow does not reach a threshold value preset in accordance with the operating state of the internal combustion engine, it is determined that clogging as occurred in the EGR passage. In such a case, it is also possible to determine whether or not the clogging has occurred in the EGR passage by dividing the lift amount detected by the lift sensor into two subsystems, extracting solely a pulse component therefrom, calculating an amplitude of the extracted pulse component, and comparing the calculated amplitude with a threshold value.
A trouble-detection apparatus for an EGR system comprising an EGR passage for communicating an exhaust passage of an internal combustion engine with an intake passage thereof and an EGR control valve for controlling a flow rate of exhaust-gas recirculating through the EGR passage, wherein
A trouble-detection apparatus for an EGR system of an internal combustion engine comprising an EGR passage for communicating an exhaust passage of the internal combustion engine with an intake passage thereof and an EGR control valve for controlling a flow rate of exhaust-gas recirculating through the EGR passage, wherein the EGR control valve is controlled by a negative pressure so that the negative pressure supplied to the EGR control valve is controlled in a feedback manner in accordance with a lift amount of the EGR control valve detected by a lift sensor and the operation state of the engine, the apparatus comprises:
A trouble-detection apparatus for an EGR System of an internal combustion engine, comprising an EGR passage for communicating an exhaust passage of the internal combustion engine with an intake passage thereof and an EGR control valve for controlling a flow rate exhaust-gas recirculating through the EGR passage, wherein the EGR control valve is controlled by a negative pressure so that the negative pressure supplied to the EGR control valve is controlled in a feedback manner in accordance with a lift amount of the EGR control valve detected by a lift sensor and the operation state of the engine, wherein the apparatus comprises:
Dependencies are inferred from the claim text.