摘要:
A sensor that continuously estimates a PM amount in exhaust gas. The sensor includes a filter member 31 including a plurality of cells that trap PM in exhaust gas, electrode members 32, 33 arranged to face each other with the cell interposed therebetween and forming a capacitor, an electric heater 34 that executes, when a predetermined amount of PM has accumulated in the cells, filter regeneration for combusting and removing the PM, a temperature sensor 35 that acquires the temperature of the filter member 31, a storage unit 40 that stores therein a reference temperature, which is the temperature of the filter member 31 in a case where the filter regeneration has been executed in a state in which PM is not flowing into the filter member 31, and estimation units 42, 43, 44 that estimate a PM amount included in the exhaust gas based on an electrostatic capacitance change amount between the electrode members 32, 33 during a regeneration interval period, and estimate the PM amount included in the exhaust gas based on a difference between the temperature acquired by the temperature sensor 35 and the reference temperature during a filter regeneration interval.
摘要:
An exhaust gas cleaning system for an internal combustion engine is provided with, in an exhaust passage (15) of an internal combustion engine (10) and in order from an upstream side: a hydrocarbon supply unit (32); an upstream side catalyst unit (31 a) of an oxidation catalyst, a NOx reduction catalyst, or the like; and a catalyst-equipped fine particle collection filter (31b) having a hydrocarbon adsorption function, wherein when a vehicle on which the engine (10) is mounted accelerates after driving for a preset set time period (ta) at a temperature (Tg1) of exhaust gas (G) equal to or less than a preset set exhaust gas temperature (TO), the supply of hydrocarbon into the exhaust gas (G) is started when an exhaust gas temperature (Tg) becomes equal to or more than a preset first set temperature (T1), and the supply of hydrocarbon is terminated when a preset termination condition is satisfied. As a result, when the vehicle is accelerated from steady driving in a low-speed, low-load operation state in which the temperature (Tg1) of the exhaust gas (G) is low, and a NOx generation amount is temporarily increased, the amount of NOx emitted from the internal combustion engine (10) is reduced.
摘要:
The invention relates to an exhaust purification system that can prevent a NH 3 slip caused by an excessive injection of urea water and includes: an SCR (41) that purifies NOx contained in an exhaust gas using ammonia, as a reducing agent, produced from urea water; a urea water injection device (60) that injects the urea water into an exhaust passage (12) upstream from the SCR (41); an estimated-adsorption-amount calculation unit (51) that calculates an estimated adsorption amount of the ammonia adsorbed in the SCR (41); an injection controll unit (52) that executes an injection control of the urea water injection device (60) based on the estimated adsorption amount; and an estimated-adsorption-amount change unit (53) that changes the estimated adsorption amount used for the injection control into a value increased or decreased by a predetermined amount when a predetermined condition is established that can cause a difference between an actual adsorption amount of the ammonia adsorbed in the SCR (41) and the estimated adsorption amount.
摘要:
A diagnostic device for a sensor 100 provided in an exhaust passage 11 of an internal combustion engine 10 of a vehicle and detecting nitrogen compounds in exhaust gas, the diagnostic device including an offset diagnosis unit 42 which diagnoses, during deceleration of the vehicle in which the internal combustion engine 10 stops fuel injection, an offset amount of a sensor value of the sensor 100 from a zero point based on the sensor value of the sensor value, and a diagnosis prohibition unit 44 which prohibits the diagnosing of the offset amount when a flow rate of the exhaust gas of the internal combustion engine 10 rapidly increases while the offset amount is diagnosed by the offset diagnosis unit 42.
摘要:
An exhaust gas after-treatment device 31 including an oxidation catalyst 31a and a DPF 31b in order from an upstream side is provided in an exhaust passage 15 of an internal combustion engine 10. A target value Et of an EGR rate E in EGR control is set to be a second EGR rate E2 higher than a first EGR rate E1 at the time of a normal operation of the internal combustion engine 10 and the EGR control is performed, in a case where a catalyst index temperature T that indexes a temperature of the oxidation catalyst 31a falls within a set temperature region Rab between a lower limit set temperature Ta and an upper limit set temperature Tb which are preliminarily set, and where an estimated PM deposition amount V of the DPF 31b is less than a preliminarily set regeneration start threshold value Vc, after an operation state of the internal combustion engine 10 transitions from a traveling operation state to an idling operation state. Thereby, in the idling operation state after travel of a vehicle, generation of NO 2 by the oxidation catalyst 31a included in the exhaust gas after-treatment device 31 of the exhaust passage 15 is decreased, and emission of NO 2 to the atmosphere is suppressed.
摘要:
Provided is a transmission device of a vehicle, that can use a manual transmission without modifications, and can perform automatic gear shifting. A transmission is provided with shift blocks for regulating shifting between gear positions so as to achieve the automatic gear shifting. This vehicle transmission device includes the shift block for the reverse-1st speed (B1), the shift block for the 4th speed-5th speed (B4), the shift block for the 2nd speed-3rd speed (B2), and the shift block for the 6th speed (B6) arranged in this order in a selection operation direction. The vehicle transmission device also includes first through fourth shift levers (24a, 25a, 25b, 24b) that engage respectively with the shift blocks, a first select actuator (30a) that moves the first or second shift lever (24a, 25a) for a select operation, a first shift actuator (31a) that moves the first or second shift lever (24a, 25a) for a shift operation, a second select actuator (30b) that moves the third or fourth shift lever (25b, 24b) for the select operation, and a second shift actuator (31b) that moves the third or fourth shift lever (25b, 24b) for the shift operation.