Denso Corporation

Denso Corpora Tion

Manabu Yoshidome

Masayuki Tamura

Masahiro Yamamoto

Go Miyagawa

Masato Katsuno

Takashi Araki

Toshihiro Sakawa

Ryozo Kayama

Yuki Murayama

Yusuke Todo

Kazuhiko Koike

Yoshimitsu Takashima

Hironobu Shimokawa

Kensuke Takizawa

Katsuhiko Takeuchi

Taiyo Hiroi

It is to determine whether a temperature rise condition of a first cell or a second cell is satisfied based on whether a first parameter has exceeded a predetermined first threshold or a second parameter has exceeded a predetermined second threshold. After satisfaction of the temperature rise condition, it is to determine that an exhaust gas sensor is in an active state upon determination that a corresponding time condition is satisfied.

Control apparatus

A microcomputer includes a voltage application unit that selectively applies a normal voltage and a removal voltage higher than the normal voltage to a first cell of the exhaust gas sensor. The first cell is configured to remove, based on the removal voltage, oxygen in an exhaust gas from an internal combustion engine. The microcomputer includes an element temperature measurement unit that measures an element temperature parameter indicative of a temperature of the first cell. The microcomputer includes a termination determination unit that determines, based on the element temperature parameter, a termination time of terminating the application of the removal voltage to the first cell by the voltage application unit.

After an engine is started, an ECU performs first regeneration processing of a PM sensor through heating by a heater and, after the first regeneration processing, applies a voltage continuously to detection electrodes for a predetermined voltage application period. The ECU causes PM to adhere to an insulating substrate due to the voltage application and, at a time point after the predetermined time period has elapsed, determines the amount of PM that is adhering to the insulating substrate. When a predetermined condition is satisfied outside the voltage application period, the ECU determines whether the amount of adhering PM on the insulating substrate is equal to or greater than an excess determination threshold value. If the amount of adhering PM is determined to be equal to or greater than the excess determination threshold value, the ECU performs second regeneration processing of the PM sensor, through heating by the heater.

Sensor control apparatus

An apparatus which detects particulate matter is provided. This apparatus estimates a volume of water inside an exhaust passage using estimation sections. When an estimated volume of water is larger than a water drainage threshold, an element portion is heated using a heater by the first temperature range controller, in a temperature range which resists water-induced cracking independent of a volume of water droplets. If the estimated volume of water is less than a water drainage threshold, the water drainage determination section determines that the water drainage of the exhaust passage is completed. Additionally, if it is estimated that the water drainage is completed, the element portion is heated by a second temperature controller at temperature lower than a starting temperature of combustion of particulate matter and in order to repel water adhered onto the element portion in a water-repellent temperature range for a predetermined period.

Particulate matter detection apparatus that mitigates water collection

A particulate matter detecting device includes: an element unit on which particulate matter contained in exhaust gas from an internal combustion engine is deposited; a heater that heats the element unit; a detecting unit that detects the amount of particulate matter on the basis of electrical characteristics of the element unit; and a control unit that controls the operation of the heater. For a predetermined period that does not include a period in which the particulate matter is deposited on the element unit, the control unit operates the heater using a predetermined amount of control set in advance such that the temperature of the element unit is higher than the temperature of the exhaust gas and lower than a predetermined temperature at which the element unit is thermally degraded.

Particulate matter detecting device

A control unit () estimates an output value of a PM sensor (S) located at a downstream side of a DPF used as a reference filter, and detects whether the estimated output value exceeds a predetermined value (S). When the estimated output value exceeds the predetermined value (YES in S), the control unit detects an output value of the PM sensor (S), and a heater heats the PM sensor (S). The control unit detects an output value of the PM sensor (S) after the PM sensor is heated, and calculates a change ratio of the output values of the PM sensor before and after heating (S). The control unit estimates an average particle size of PM based on the calculated change ratio (S), and detects whether the DPF has failed based on a comparison result of a corrected output value of the PM sensor with a threshold value.

Filter failure detection device and particulate matter detection device

A particulate matter detection apparatus is provided with an element portion onto which PM contained in exhaust gas of an engine adheres thereto. A heater which heats the element portion, a quantity detecting portion which detects a quantity of the PM based on electrical properties of the element portion and a temperature detecting portion which detects a temperature of the element portion. The apparatus is further provided with a first and second temperature controller. The first temperature controller heats the element portion using a heater in a first period, which excludes a period in which PM adheres to the element portion based on a detected temperature of the element portion. The element portion is heated in a first temperature range to combust soluble organic fractions contained in the PM and resist melting of ash components contained in the PM. The first period excludes a period in which PM adheres to the element portion. The second temperature controller heats the element portion in the second temperature range, which is higher than the first temperature range using the heater, such that ash is combusted, based on a detected temperature of the element portion.

Particulate matter detection apparatus

A filter malfunction determination apparatus includes a calculator that calculates, upon determination that a rapid output increase has occurred, an amount of change of a parameter value output from a sensor before and after the rapid output increase. The calculator calculates, based on the calculated amount of change, a correction value for correcting at least one of the parameter value output from the sensor and a malfunction determination threshold. The filter malfunction determination apparatus includes an offset corrector configured to perform, based on the correction value, offset correction of at least one of the parameter value output from the sensor and the malfunction determination threshold after determination that the rapid output increase has occurred.

Apparatus for determining whether there is malfunction in filter device

A filter fault detection apparatus for a filter mounted on an exhaust passage of an internal combustion engine for collecting particulate matter includes a sensor mounted on the exhaust passage downstream of the filter. The sensor includes an insulative sensor element formed with a pair of electrodes on which particulate matter is collected, the sensor generating a sensor output corresponding to an amount of particulate matter collected on the sensor element when the electrodes become electrically conductive therebetween, causing the sensor output to rise. The apparatus further includes an acquiring unit that acquires, as an output variation, a temporal variation of the sensor output after rise of the sensor output, and a fault determination unit that performs a fault detection process for detecting presence of a fault in the filter based on the output variation of the sensor output to determine whether the filter is normal or faulty.

Filter fault detection apparatus

The internal combustion engine controller includes an oxygen concentration sensor outputting an electric signal having a value depending on an oxygen concentration in an exhaust gas flowing through an exhaust passage of an internal combustion engine, and a control unit controlling fuel injection amount depending on at least the electric signal, the control unit being capable of performing atmospheric learning to calibrate the oxygen concentration sensor. The control unit is configured to perform the atmospheric learning when a changing rate of the value of the electric signal is lowered from above a predetermined threshold rate to below the predetermined threshold rate after a time of start of cutoff of fuel supply to the engine.

Internal combustion engine controller

A fuel injection is carried out as n split injections. Each of injection quantities is defined by dividing an injection quantity into n fuel injections. A FCCB correction and an ISC correction are carried out while n split injection cycles are performed. A value obtained by adding up an FCCB correction for each injection cycle and an ISC correction for each injection cycle is updated and stored as a learned injection quantity. The learned injection quantity is calculated as an injection quantity correction for each cylinder to be added to a command injection quantity for each injection cycle.

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Kariya, Japan

Manabu Yoshidome