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    • 4. 发明申请
    • DIAGNOSTIC DEVICE AND METHOD OF ENGINE EXHAUST PURIFYING SYSTEM
    • 诊断装置和发动机排气净化系统的方法
    • US20080028828A1
    • 2008-02-07
    • US11830130
    • 2007-07-30
    • Yoichi IihoshiShinji NakagawaToshio HoriYoshikuni Kurashima
    • Yoichi IihoshiShinji NakagawaToshio HoriYoshikuni Kurashima
    • G01N7/00
    • F02D41/1443F02D41/1441F02D41/1456F02D41/1495Y02T10/22
    • A diagnostic device and method of an engine exhaust purifying system, which perform active control of an air-fuel ratio and can make diagnosis of air-fuel ratio sensors, catalysts, etc. in the engine exhaust purifying system with high accuracy and reliability while avoiding a worsening of exhaust emissions, an increase of revolution variations, etc. The diagnostic device comprises an exhaust air-fuel ratio control unit for performing control to keep an air-fuel ratio of exhaust gas flowing into a main catalyst near a stoichiometric ratio in accordance with outputs of downstream air-fuel ratio sensors, a rich/lean switching unit for switching over an air-fuel ratio in each of the cylinder groups to be rich or lean, thereby making diagnosis of each downstream air-fuel ratio sensor, a response detecting unit for detecting a response of the downstream air-fuel ratio sensor when the rich/lean switching of the air-fuel ratio in each cylinder group is performed, and a downstream sensor deterioration determining unit for determining a deterioration of the downstream air-fuel ratio sensor based on the detected response.
    • 一种发动机排气净化系统的诊断装置和方法,其能够主动地控制空燃比并且可以高精度和可靠地在发动机排气净化系统中对空燃比传感器,催化剂等进行诊断,同时避免 废气排放恶化,旋转变化的增加等。诊断装置包括排气空燃比控制单元,用于进行控制以使排气流入主催化剂的空燃比接近化学计量比 具有下游空燃比传感器的输出,用于切换每个气缸组中的空燃比的丰富/稀薄切换单元以富或稀,从而对每个下游空燃比传感器进行诊断,响应 检测单元,用于当执行每个气缸组中的空燃比的丰富/稀薄切换时,检测下游空燃比传感器的响应;以及下游传感器测定 确定单元,用于基于检测到的响应来确定下游空燃比传感器的劣化。
    • 5. 发明申请
    • Diagnostic device and method of engine exhaust purifying system
    • 发动机排气净化系统诊断装置及方法
    • US20050262828A1
    • 2005-12-01
    • US11136533
    • 2005-05-25
    • Yoichi IihoshiShinji NakagawaToshio HoriYoshikuni Kurashima
    • Yoichi IihoshiShinji NakagawaToshio HoriYoshikuni Kurashima
    • F02D45/00B01D53/94F01N3/20F01N3/24F01N3/28F02D41/04F02D41/14F02D41/36F01N3/00F01N7/00
    • F02D41/1443F02D41/1441F02D41/1456F02D41/1495Y02T10/22
    • A diagnostic device and method of an engine exhaust purifying system, which perform active control of an air-fuel ratio and can make diagnosis of air-fuel ratio sensors, catalysts, etc. in the engine exhaust purifying system with high accuracy and reliability while avoiding a worsening of exhaust emissions, an increase of revolution variations, etc. The diagnostic device comprises an exhaust air-fuel ratio control unit for performing control to keep an air-fuel ratio of exhaust gas flowing into a main catalyst near a stoichiometric ratio in accordance with outputs of downstream air-fuel ratio sensors, a rich/lean switching unit for switching over an air-fuel ratio in each of the cylinder groups to be rich or lean, thereby making diagnosis of each downstream air-fuel ratio sensor, a response detecting unit for detecting a response of the downstream air-fuel ratio sensor when the rich/lean switching of the air-fuel ratio in each cylinder group is performed, and a downstream sensor deterioration determining unit for determining a deterioration of the downstream air-fuel ratio sensor based on the detected response.
    • 一种发动机排气净化系统的诊断装置和方法,其能够主动地控制空燃比并且可以高精度和可靠地在发动机排气净化系统中对空燃比传感器,催化剂等进行诊断,同时避免 废气排放恶化,旋转变化的增加等。诊断装置包括排气空燃比控制单元,用于进行控制以使排气流入主催化剂的空燃比接近化学计量比 具有下游空燃比传感器的输出,用于切换每个气缸组中的空燃比的丰富/稀薄切换单元以富或稀,从而对每个下游空燃比传感器进行诊断,响应 检测单元,用于当执行每个气缸组中的空燃比的丰富/稀薄切换时,检测下游空燃比传感器的响应;以及下游传感器测定 确定单元,用于基于检测到的响应来确定下游空燃比传感器的劣化。
    • 6. 发明授权
    • Diagnostic device and method of engine exhaust purifying system
    • 发动机排气净化系统诊断装置及方法
    • US07549284B2
    • 2009-06-23
    • US11830130
    • 2007-07-30
    • Yoichi IihoshiShinji NakagawaToshio HoriYoshikuni Kurashima
    • Yoichi IihoshiShinji NakagawaToshio HoriYoshikuni Kurashima
    • F01N3/00
    • F02D41/1443F02D41/1441F02D41/1456F02D41/1495Y02T10/22
    • A diagnostic device and method of an engine exhaust purifying system, which perform active control of an air-fuel ratio and can make diagnosis of air-fuel ratio sensors, catalysts, etc. in the engine exhaust purifying system with high accuracy and reliability while avoiding a worsening of exhaust emissions, an increase of revolution variations, etc. The diagnostic device comprises an exhaust air-fuel ratio control unit for performing control to keep an air-fuel ratio of exhaust gas flowing into a main catalyst near a stoichiometric ratio in accordance with outputs of downstream air-fuel ratio sensors, a rich/lean switching unit for switching over an air-fuel ratio in each of the cylinder groups to be rich or lean, thereby making diagnosis of each downstream air-fuel ratio sensor, a response detecting unit for detecting a response of the downstream air-fuel ratio sensor when the rich/lean switching of the air-fuel ratio in each cylinder group is performed, and a downstream sensor deterioration determining unit for determining a deterioration of the downstream air-fuel ratio sensor based on the detected response.
    • 一种发动机排气净化系统的诊断装置和方法,其能够主动地控制空燃比并且可以高精度和可靠地在发动机排气净化系统中对空燃比传感器,催化剂等进行诊断,同时避免 废气排放恶化,旋转变化的增加等。诊断装置包括排气空燃比控制单元,用于进行控制以使排气流入主催化剂的空燃比接近化学计量比 具有下游空燃比传感器的输出,用于切换每个气缸组中的空燃比的丰富/稀薄切换单元以富或稀,从而对每个下游空燃比传感器进行诊断,响应 检测单元,用于当执行每个气缸组中的空燃比的丰富/稀薄切换时,检测下游空燃比传感器的响应;以及下游传感器测定 确定单元,用于基于检测到的响应来确定下游空燃比传感器的劣化。
    • 7. 发明授权
    • Diagnostic device and method of engine exhaust purifying system
    • 发动机排气净化系统诊断装置及方法
    • US07266942B2
    • 2007-09-11
    • US11136533
    • 2005-05-25
    • Yoichi IihoshiShinji NakagawaToshio HoriYoshikuni Kurashima
    • Yoichi IihoshiShinji NakagawaToshio HoriYoshikuni Kurashima
    • F01N3/00F01N3/10
    • F02D41/1443F02D41/1441F02D41/1456F02D41/1495Y02T10/22
    • A diagnostic device and method of an engine exhaust purifying system, which perform active control of an air-fuel ratio and can make diagnosis of air-fuel ratio sensors, catalysts, etc. in the engine exhaust purifying system with high accuracy and reliability while avoiding a worsening of exhaust emissions, an increase of revolution variations, etc. The diagnostic device comprises an exhaust air-fuel ratio control unit for performing control to keep an air-fuel ratio of exhaust gas flowing into a main catalyst near a stoichiometric ratio in accordance with outputs of downstream air-fuel ratio sensors, a rich/lean switching unit for switching over an air-fuel ratio in each of the cylinder groups to be rich or lean, thereby making diagnosis of each downstream air-fuel ratio sensor, a response detecting unit for detecting a response of the downstream air-fuel ratio sensor when the rich/lean switching of the air-fuel ratio in each cylinder group is performed, and a downstream sensor deterioration determining unit for determining a deterioration of the downstream air-fuel ratio sensor based on the detected response.
    • 一种发动机排气净化系统的诊断装置和方法,其能够主动地控制空燃比并且可以高精度和可靠地在发动机排气净化系统中对空燃比传感器,催化剂等进行诊断,同时避免 废气排放恶化,旋转变化的增加等。诊断装置包括排气空燃比控制单元,用于进行控制以使排气流入主催化剂的空燃比接近化学计量比 具有下游空燃比传感器的输出,用于切换每个气缸组中的空燃比的丰富/稀薄切换单元以富或稀,从而对每个下游空燃比传感器进行诊断,响应 检测单元,用于当执行每个气缸组中的空燃比的丰富/稀薄切换时,检测下游空燃比传感器的响应;以及下游传感器测定 确定单元,用于基于检测到的响应来确定下游空燃比传感器的劣化。