Control system and control method for internal combustion engine

• Main Authors: WAKAO KAZUHIRO, HASHIDA TATSUHIRO
• Format: Patent
• Language: Chinese; English
• Published: 12.10.2016
• Subjects: BLASTING; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; ENGINE PLANTS IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; LIGHTING; MACHINES OR ENGINES IN GENERAL; MEASURING; MECHANICAL ENGINEERING; PHYSICS; STEAM ENGINES; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TESTING; WEAPONS

A control system for an engine including a limiting current sensor, the control system includes an ECU configured to: execute a sweep process for gradually reducing a voltage that is applied to the sensor from a first voltage (V1) to a second voltage (V2); acquire an extreme value (Ip) of an output current of the sensor during execution of the sweep process from output currents of the sensor while a voltage included in a specific voltage range is applied to the sensor, the extreme value being predicted to be output; and detect the concentration of SOx in exhaust gas based on the extreme value and a reference value (Iref), the reference value being a value of limiting current of the sensor, the value of limiting current of the sensor corresponding to the concentration of oxygen having the constant value. 种用于包括极限电流式传感器的发动机的控制系统，所述控制系统包括ECU，所述ECU被配置成：执行把施加于传感器的电压从第电压(V1)逐渐降低到第二电压(V2)的扫描处理；从在向传感器施加包含在预测将输出极值的特定电压范围中的电压时的传感器的输出电流中，获得所述扫描处理的执行期间的传感器的输出电流的极值(Ip)；和根据所述极值和基准值(Iref)，检测废气中的SOx的浓度，所述基准值是传感器的极限电流的值，传感器的极限