Patent application number | Description | Published |
20080270006 | Fuel Control System of Internal Combustion Engine - The invention precisely achieves an air fuel ratio control precision in each of operating regions of an engine, particularly a demand air fuel ratio at a time of an engine transition. In a fuel control system correcting a basic fuel amount in such a manner as to estimate a fuel adhered to an air intake pipe of an engine and an evaporated fuel from the adhered fuel so as to achieve a demanded air fuel ratio, a temperature of a fuel adhered portion is estimated on the basis of an amount relation between the fuel to be adhered and the already adhered fuel, or a heat quantity balance. A fuel adhesion amount and a fuel evaporation amount are determined on the basis of the estimated temperature. | 10-30-2008 |
20090084351 | IDLE SPEED CONTROL METHOD FOR CONTROLLING THE IDLE SPEED OF AN ENGINE WITH A CONTINUOUS VARIABLE EVENT AND LIFT SYSTEM AND A FUEL CONTROL SYSTEM USING THE METHOD - Air quantity of ISC is roughly controlled on the basis of the lift amount of an intake valve, whose air flow rate control range is wide. The adjustment of the air quantity beyond the range of the rough control is achieved by the control based on a phase of the intake valve. As a result, a required flow rate can be achieved with high accuracy. If only the intake-valve lift amount whose air flow rate control range is wide is used to achieve the required air quantity of ISC, a fuel control system requires both a high degree of accuracy of an intake-valve lift amount sensor and a high degree of accuracy of an intake-valve lift amount control mechanism itself, which leads to high system costs. | 04-02-2009 |
20090157282 | Air-Fuel Ratio Control Apparatus by Sliding Mode Control of Engine - Factors affecting the response time of a transfer system from the combustion of injected fuel to the detection of its oxygen concentration include a stroke delay time due to an engine speed, the dependence of an LAF sensor response time on an exhaust gas flow rate, a response time change of the LAF sensor due to its deterioration with time, and the like. If a hyperplane of the sliding mode is fixed without considering the above-mentioned factors affecting the response time of the transfer system, an overshoot or oscillation of a feedback system may occur at low speeds of the engine even if preferable feedback responsiveness can be achieved, for example, at high speeds of the engine. This results in aggravated exhaust emissions, degraded drivability due to torque fluctuations, and fluctuations in idle speed. | 06-18-2009 |
20100012100 | Control Device for an Internal Combustion Engine - A control device for an internal combustion engine can quickly control, regardless of variation of the quantity of evaporative fuel gas adsorbed in a canister of the engine, the air-fuel ratio to a target value by performing air-fuel ratio feedback compensation control so as not to cause the emission performance of the engine to deteriorate. For the first canister purge performed after the engine is started up, a purge valve is driven for a prescribed period at a prescribed purge flow rate. During the period, the quantity of purged fuel is calculated using an air-fuel ratio feedback factor. Based on the fuel quantity thus calculated, an adsorption quantity estimation section estimates the quantity of evaporative fuel gas adsorbed in the canister. At the same time, a fuel evaporation quantity calculation section calculates the quantity of fuel evaporating from a fuel tank according to the condition of the engine and vehicle, and the quantity of fuel in the canister is estimated based on the balance between the quantities of fuel charged to and purged from the canister. | 01-21-2010 |
20100305832 | Engine Control Device - There is provided an engine control device which can accurately calculate a compensation coefficient used for transient compensation of an ignition timing without involving a complicated and large-scale calculation model in order to prevent a combustion deterioration and the like caused by a mechanical response delay and the like of the variable valve timing mechanism at a transition time such as an acceleration/deceleration time. The angular difference between each current real phase of the intake/exhaust valves | 12-02-2010 |
20110231081 | Control Method of Internal Combustion Engine - The invention provides a method for preferably controlling an internal combustion engine by precisely estimating a current value of a temperature of an exhaust device of an internal combustion engine provided with a variable valve, an exhaust turbo supercharger and the like, and controlling an affector of a temperature of an exhaust gas on the basis of a difference between a reference value of the exhaust device temperature and the current value of the exhaust device temperature. The method computes a temperature of an exhaust gas on the basis of a rotating speed, a charging efficiency, an ignition timing, an equivalent ratio, an external EGR rate, an exhaust valve opening timing, and a supercharging pressure, estimates a temperature of an exhaust device on the basis of the exhaust gas temperature, an amount of an intake air, a temperature of a fluid around the exhaust device and a flow rate around the exhaust device, and transiently corrects at least one of the ignition timing, the equivalent ratio, the external EGR rate, and the exhaust valve opening timing, on the basis of the estimation value and the reference value. | 09-22-2011 |
20120290193 | Internal Combustion Engine Control Device - An internal combustion engine control device is provided which can accurately estimate intake pipe temperature behavior during transient time even in an internal combustion engine embedded with a variable valve or a turbocharger. The internal combustion engine control device estimates transient behavior of the intake pipe temperature, on the basis of a flow rate (dGafs/dt) of gas flowing into the intake pipe, a flow rate (dGcyl/dt) of gas flowing from the intake pipe, an intake pipe pressure Pin, and a temporal changing rate (dPin/dt) of the intake pipe pressure. The device performs knocking control during transient time, on the basis of the estimated transient behavior of the intake pipe temperature. | 11-15-2012 |
20130081600 | Purging Device for Fuel Vapors During Idling Stop of Internal Combustion Engine - Disclosed is an engine control unit intended to prevent fuel vapors from a fuel tank from being released to the atmosphere and causing degradation of gas emission performance. In order to fulfill the object, a control unit according to an aspect of this invention includes means for discharging the fuel from a purging device constructed to adsorb the fuel vapors that rise from the fuel tank, and discharge the adsorbed fuel vapors into an air intake pipe, to an upstream side of a catalyst provided in an exhaust pipe, and when the control unit stops the engine that is running idle, the unit drives the discharge means to accelerate purification of the fuel vapors by sending the vapors to the catalyst under an active state immediately after the engine stop. | 04-04-2013 |
20130160739 | Control Device and Control Method for Internal Combustion Engine - Because opening of a flow enhancement valve affects not only a flow but also a flow rate, when the opening of the flow enhancement valve is transiently changed, if an ignition correction control is conducted on the basis of a relationship obtained in a steady operation state of the flow enhancement valve opening and the ignition timing, there occurs such a drawback that the ignition timing is set to a retard side or an advance side of the optimal point. In a control device for an internal combustion engine having a flow enhancement valve, an intake air quantity flowing into a cylinder is calculated on the basis of the intake air quantity detected by an air flow sensor, a rotating speed, and an operating state of the flow enhancement valve, a turbulent intensity index within the cylinder is calculated on the basis of the rotating speed, the intake air quantity flowing into the cylinder, and the operating state of the flow enhancement valve, and an ignition timing is calculated on the basis of the rotating speed, the intake air quantity flowing into the cylinder, and the turbulent intensity index. | 06-27-2013 |
20140298802 | Control Device for Internal Combustion Engine - In internal combustion engines that return exhaust gas branching from downstream section of a turbine to an upstream section of a compressor during exhaust gas return in a supercharged state, the present invention closes an air bypass valve that bypasses the compressor while the vehicle is decelerating, and also opens a wastegate valve that bypasses or diverts gases away from the turbine in order to resolve a phenomenon in which the amount of exhaust gas temporarily increases and the exhaust gas cannot be supplied at a stable target value while the vehicle is decelerating due to the length of the path from the convergence section where the new air meets the EGR, to the cylinder, and due to the opening of the air bypass valve of the air bypass path joining the top and bottom of the compressor during deceleration. | 10-09-2014 |