-
公开(公告)号:US20110030451A1
公开(公告)日:2011-02-10
申请号:US12851124
申请日:2010-08-05
申请人: Sabine Roesch , Benjamin Gaertner , Johannes Grabis , Alexander Hetznecker , Thorsten Ochs , Henrik Schittenhelm
发明人: Sabine Roesch , Benjamin Gaertner , Johannes Grabis , Alexander Hetznecker , Thorsten Ochs , Henrik Schittenhelm
IPC分类号: G01N37/00
CPC分类号: F02D41/222 , F01N11/00 , F01N2560/05 , F01N2560/20 , F02D41/1466 , F02D41/1494 , G01N15/0656 , Y02T10/40
摘要: The invention relates to a method for the self-diagnosis of a particle sensor used for determining a particle content in a gaseous stream, wherein the particle sensor includes on its surface at least two interlocking, interdigital electrodes and a heating element separated from said electrodes by an insulation layer. Said particle sensor can be heated by said heating element in a regeneration phase, and a soot concentration can thereby be removed from the same. Provision is made according to the invention for a semiconductive layer to be formed in the insulation layer directly beneath the electrodes by means of external doping or auto-doping and in order to perform the self-diagnosis for a measurement voltage to be applied at least periodically between the electrodes and a self-diagnostic current to be measured. The invention furthermore relates to a device for the self-diagnosis of a corresponding particle sensor, said particle sensor being connected to an engine management system or a sensor control unit and said engine management system or said sensor control unit including apparatuses for diagnosing the soot concentration on the particle sensor and the particle sensor itself. Said engine management system or said sensor control unit includes according to the invention apparatuses for evaluating a self-diagnostic current when applying an AC or DC voltage as a measurement voltage to the electrodes. When using DC voltage as the measurement voltage, the particle sensor can furthermore be heated for a short time to temperatures >500 EC via said engine management system or said sensor control unit in order to perform the self-diagnosis. A self-diagnosis of the electrodes, which are provided for the particle measurement, can be carried out as a pre-delivery inspection by the manufacturer as well as in subsequent use with the presented diagnostic method and the corresponding device for carrying out this method. A preferred application of the method provides for its use within the scope of the on-board diagnosis of diesel internal combustion engines.
-
公开(公告)号:US08794046B2
公开(公告)日:2014-08-05
申请号:US12851124
申请日:2010-08-05
申请人: Sabine Roesch , Benjamin Gaertner , Johannes Grabis , Alexander Hetznecker , Thorsten Ochs , Henrik Schittenhelm
发明人: Sabine Roesch , Benjamin Gaertner , Johannes Grabis , Alexander Hetznecker , Thorsten Ochs , Henrik Schittenhelm
IPC分类号: G01D18/00
CPC分类号: F02D41/222 , F01N11/00 , F01N2560/05 , F01N2560/20 , F02D41/1466 , F02D41/1494 , G01N15/0656 , Y02T10/40
摘要: Self-diagnosis of a particle sensor may be used for determining a particle content in a gaseous stream. The particle sensor may include at least two interlocking, interdigital electrodes and a heating element. The heating element may be separated from the electrodes by an insulation layer. The particle sensor may be heated in a regeneration phase and a soot load on the particle sensor can thereby be removed. A semiconductive layer may be formed in the insulation layer directly beneath the electrodes by means of external doping or auto-doping. To perform a self-diagnosis, a measurement voltage may be applied at least periodically between the electrodes and a self-diagnostic current may be measured.
摘要翻译: 颗粒传感器的自我诊断可用于确定气流中的颗粒含量。 颗粒传感器可以包括至少两个互锁的叉指电极和加热元件。 加热元件可以通过绝缘层与电极分离。 颗粒传感器可以在再生阶段被加热,从而可以去除颗粒传感器上的烟灰负荷。 可以通过外部掺杂或自动掺杂在电极正下方的绝缘层中形成半导体层。 为了执行自诊断,可以至少周期性地在电极之间施加测量电压,并且可以测量自诊断电流。
-