Patent application number | Description | Published |
20090025467 | Abnormality detection apparatus and abnormality detection method for internal combustion engine - A crankshaft of an engine is connected to a carrier shaft of a planetary gear via a damper. The damper includes a torsion member generating elastic force for suppressing relative rotation, when the crankshaft and the carrier shaft are relatively rotated. A control unit estimates engine torque with using rotation angular acceleration of the crankshaft calculated from a detected value of an engine speed sensor, and corrects the estimated engine torque with a correction term of the elastic force of the damper calculated based on a damper torsional angle. Then, the control unit diagnoses an abnormality of the engine based on the estimated engine torque after correction. | 01-29-2009 |
20090118990 | Internal Combustion Engine System and Misfire Determining Method for Internal Combustion Engine - An influence component N | 05-07-2009 |
20090120699 | Hybrid Vehicle and Control Method Thereof - A hybrid vehicle | 05-14-2009 |
20090139686 | Cooling System, Control Method of Cooling System, and Vehicle Equipped With Cooling System - A cooling system is equipped with a circulation flow path arranged to flow a coolant into an engine, a motor drive system flow path branched off from the circulation flow path and arranged to flow the coolant into a motor drive system, a flow rate distribution regulator provided at a junction of the circulation flow path and the motor drive system flow path, and an electric pump configured to pressure-feed the coolant through the circulation flow path. In the cooling system, the procedure of flow rate control sets an engine flow rate demand Vwe based on a rotation speed Ne and a torque te of the engine and a coolant temperature Te (step S | 06-04-2009 |
20090145210 | MISFIRE DETERMINATION DEVICE AND METHOD FOR INTERNAL COMBUSTION ENGINE, AND VEHICLE INCLUDING MISFIRE DETERMINATION DEVICE - A misfire determination device for a multi-cylinder internal combustion engine, of which an output shaft is connected, through a torsion element, to a downstream shaft downstream of the torsion element, includes: an first portion for detecting an output shaft rotational speed that is the rotational speed of the output shaft; a second portion for detecting a downstream shaft rotational speed that is the rotational speed of the downstream shaft; a third portion that calculates a component caused by an influence of resonance due to torsion of the torsion element on the output shaft rotational speed, based on the acquired output shaft rotational speed and the acquired downstream shaft rotational speed; and a fourth portion for determining the occurrence of the misfire in the internal combustion engine based on a rotational speed that is obtained by subtracting the calculated component from the detected output shaft rotational speed. | 06-11-2009 |
20100050753 | MISFIRE DETECTION APPARATUS AND MISFIRE DETECTION METHOD FOR INTERNAL COMBUSTION ENGINE - In a misfire detection apparatus and method that detects a misfire in an internal combustion engine with cylinders provided in a vehicle, it is determined that a misfire occurs in the engine, if a first condition and a second condition are satisfied; the first condition is a condition that a rotational speed of an output shaft of the engine decreases by an amount equal to or larger than a first change amount during a time period from a compression top dead center in a first cylinder to the compression top dead center in a second cylinder; and the second condition is a condition that the rotational speed of the output shaft increases by an amount equal to or larger than a second change amount during a time period from the compression top dead center in the second cylinder to the compression top dead center in a third cylinder. | 03-04-2010 |
20100152991 | Engine Misfire Identification Device for Internal Combustion Engine, Vehicle Equipped With the Same and Method of Engine Misfire Identification - An engine misfire is identified by ordinary engine misfire detection processing when the operating condition of an engine comprising a rotation speed Ne and a torque Te does not belong to a resonance region of a rear portion including a damper as a torsion element (S | 06-17-2010 |
20100218598 | Misfire Judging Device of Internal Combustion Engine, Vehicle Mounted With It and Misfire Judging Method - When an operating state constituted of a rotation speed Ne and torque Te of an engine belongs in a resonance region in a post-stage including a damper connected to a crankshaft of the engine, a subtraction sine wave for removing an influence by resonance is calculated, and misfire is judged depending on whether or not a variation amount ΔF of a rotation speed F after processing, obtained by subtracting the calculated subtraction sine wave from a variation in 30-degree rotation speed N | 09-02-2010 |
20100300386 | CONTROL APPARATUS OF INTERNAL COMBUSTION ENGINE FOR VEHICLE - A control apparatus for an internal combustion engine of a vehicle sets the overlap amount of an intake valve and an exhaust valve small when the engine is idling and the vehicle is stopped. Also, the control apparatus sets the overlap amount large using normal control when the vehicle is traveling, even if the engine is idling. | 12-02-2010 |
20110120394 | COOLING SYSTEM FOR ENGINE - A cooling system includes a cooling portion for flowing a coolant therethrough, a coolant sensitive sensor portion detecting a temperature of the coolant, a heat exchanging device using a heat of the coolant, a circulation flow varying device for varying a circulation flow, a circulation path for flowing the coolant therethrough, and a controller for regulating the circulation flow by controlling the circulation flow varying device while referring to the temperature of the coolant upon a receipt of a request for a requested flow from the heat exchanging device. The controller determines a condition for warming-up when the warming-up of the engine is performed in accordance with the temperature of the coolant, controls the circulation flow varying device for warming-up the engine without circulating the coolant, and increases the circulation flow to the requested flow for a predetermined period of time when the requested flow is requested during the warming-up. | 05-26-2011 |
20120055663 | TEMPERATURE CONTROL SYSTEM FOR INTERNAL COMBUSTION ENGINE - A temperature control system for an internal combustion engine, to which a block heater for warming a coolant and keeping the coolant warm is attachable, the temperature control system includes a coolant circulating apparatus circulating the coolant, a fluid temperature detecting device detecting a fluid temperature of the coolant, a block heater disuse estimating portion estimating a possibility of disuse of the block heater under a condition that a circulation of the coolant is stopped, and a block heater usage determining portion determining whether or not the block heater is used on the basis of changes in the fluid temperature under a condition that the coolant is circulated in a case where the block heater disuse estimating portion does not estimate the disuse of the block heater. | 03-08-2012 |
20120132154 | CONTROL DEVICE FOR VARIABLE WATER PUMP - The ECU includes: a stop control portion controlling an electric water pump to stop, when an engine provided with the electric water pump pressure-feeding a coolant is warmed up; a first drive control portion controlling the electric water pump to drive for a predetermined period at least before the stop control portion performs a control, when a coolant temperature thw in starting the engine is equal to or higher than a predetermined value α. The electric water pump corresponds to a variable water pump capable of changing the flow rate of the coolant. | 05-31-2012 |
20120136519 | MOTOR VEHICLE - When cooling water temperature of the engine is not less than the water temperature threshold value, the target drive point of the engine is set based on the fuel economy optimized operation curve and the power demand of the engine, without allowing selection of the operation curve between the fuel economy optimized operation curve to drive the engine efficiently and the operation curve to drive the engine with less efficiency than the efficiency on the fuel economy optimized operation curve in at least a part of the operating area to avoid operation in the muffled area. Then, the engine is driven at the target drive point and the hybrid vehicle is driven with a torque corresponding to the torque demand. This effectively prevents the temperature rise in the cooling water for cooling of the engine due to increase in heat loss of the engine, and prevents overheating of the engine. | 05-31-2012 |
20130032101 | DEVICE FOR CONTROLLING INTERNAL COMBUSTION ENGINE - The disclosed internal combustion engine has an electric water pump and a water temperature sensor that detects coolant water temperature. An electronic control device stops the driving of the water pump when the coolant water temperature is lower than a baseline temperature. Meanwhile, the electronic control device drives the water pump in accordance with the coolant water temperature when the coolant water temperature is higher than the baseline temperature. When the driving of the water pump is stopped, the internal combustion engine forbids at least one engine control until the water pump is driven. | 02-07-2013 |
20130184972 | AIR-FUEL RATIO CONTROL APPARATUS FOR INTERNAL COMBUSTION ENGINE AND CONTROL METHOD - An air-fuel ratio control apparatus that is applied to an internal combustion engine having an intake passage to which a canister is connected via an evaporative fuel supply passage, and an exhaust passage that is provided with an exhaust gas purifier, includes a first sensor provided upstream of the exhaust gas purifier, a second sensor provided downstream of the exhaust gas purifier, and a controller that corrects a fuel injection amount through feedback on a basis of the air-fuel ratio acquired by the first sensor, modifies a correction coefficient used for feedback correction on a basis of the air-fuel ratio acquired by the second sensor, and has a storage unit that stores the modified correction coefficient. The controller prohibits the modified correction coefficient from being stored into the storage unit if a concentration of fuel in purge gas is equal to or higher than a predetermined criterial concentration. | 07-18-2013 |
20130261936 | CONTROL APPARATUS AND CONTROL METHOD FOR INTERNAL COMBUSTION ENGINE - A control apparatus for an internal combustion engine is configured to execute an air-fuel ratio control based on an output of an air-fuel ratio detector provided in an exhaust passage through which exhaust gas from a plurality of cylinders flows. The control apparatus includes an abnormal lean deviation detection portion configured to detect whether an abnormal lean deviation is occurring in at least one specific cylinder among the plurality of cylinders, the exhaust gas from the at least one specific cylinder influencing the air-fuel ratio detector more strongly than the exhaust gas from each of a rest of the plurality of cylinders; and an enriching control portion configured to execute an enriching control for the at least one specific cylinder when the abnormal lean deviation detection portion detects that the abnormal lean deviation is occurring in the at least one specific cylinder. | 10-03-2013 |