Control unit for internal combustion engine

FIELD: engine devices and pumps.

SUBSTANCE: control unit is designed for the internal combustion engine (2). Engine (2) includes a throttle valve (24) located in the intake duct (10), an EGR channel (30) for recirculating exhaust gas to the side behind the throttle valve (24) in the intake duct (10), and a valve (32) EGR located in the EGR channel (30). Control unit (50) controls fresh air volume by means of throttle valve (24) and by means of EGR valve (32) to determine the closing degree of throttle valve (24) and the opening degree of EGR valve (32), respectively, so that cause the approximation of fresh air volume or the quantitative parameter of the state, correlated with fresh air volume, to the target value. Control device (50) comprises a differential pressure control means and a switching control means. Differential pressure control means is designed to control the differential pressure of throttle valve (24) and the differential pressure control of EGR valve (32). Differential pressure control of throttle valve (24) is a control for adjusting the first differential pressure, which is the difference between gas pressure on the inlet side of throttle valve (24) and gas pressure on the exhaust side of throttle valve (24) in intake duct (10), target differential pressure of throttle valve (24) during fresh air volume control with EGR valve (32). Differential pressure control (32) of EGR valve is a control for adjusting the second differential pressure, which is the difference between gas pressure on the inlet side of EGR valve (32) and gas pressure on the exhaust side of EGR valve (32) in EGR channel (10), target differential pressure of EGR valve (32) during fresh air volume control with throttle valve (24). Switching control device is intended to switch over to controlling the fresh air volume by EGR valve (32) in case if the first differential pressure falls below the target differential pressure of throttle valve (24) during fresh air volume control by throttle valve (24). Switching control device is also intended to switch over to controlling fresh air through throttle valve (24) in case if the second differential pressure falls below the target differential pressure of EGR valve (32) during fresh air volume control with EGR valve (32).

EFFECT: increasing the response rate during control before and after switching the control.

12 cl, 16 dwg

 



 

Same patents:

FIELD: engines and pumps.

SUBSTANCE: diesel injector spray nozzle for biofuel includes housing (1) and needle (2). Needle (2) is located in housing (1). Annular groove (3) is made on inner surface of housing (1). There is well (6) and fuel spray holes (5) in lower part of housing (1). Inner part of holes (5) is provided with fuel flow shapers. The latter contribute to carbon formation reduction. Each shaper can be made in the form of insert (7) with screw channels, which is then continued to conical chamber (8) and to nozzle holes (5). Insert (7) is made in the form of a screw with double-threaded winding and turns of rectangular section.

EFFECT: possibility of achieving finer biofuel spray is provided.

5 cl, 4 dwg

FIELD: transport.

SUBSTANCE: invention relates to automotive industry and can be used in automotive engine driven compressor system. Compressor system (10) of vehicle (12) comprises compressor (16) driven by vehicle (12) engine (14). Said system comprises intake air guide (18) to force air pre-compressed by drive engine (14) turbosupercharger (20) to compressor (16). Said intake air guide (18) incorporates means (22) to flow section to construct supercharge pressure of pre-compressed air fed to compressor (16). Supercharge pressure maximum magnitude is set at idling subject to at least one of the following terms, i.e. compressor (16) oil outburst or compressor (16) power loss. Besides, invention covers the method of compressor system operation.

EFFECT: decreased power loss at idling.

15 cl, 9 dwg

FIELD: engines and pumps.

SUBSTANCE: in an inlet pipeline, at a small distance to an inlet valve of a cylinder there is a blowdown valve installed driven from a common cam shaft. In the end of an inlet stroke, 40-50° to the top dead centre (TDC), the inlet valve is opened. Spent gases go through the open inlet valve and reach the closed blowdown valve. Near the TDC, with remaining 10°, the blowdown valve is opened, and the combustion chamber is blown with air from an inlet header, afterwards the cylinder filling starts. Such solution makes it possible to substantially expand the angle of valves closure, this increasing the filling phase.

EFFECT: higher specific capacity of the engine with preservation of low toxicity of spent gases.

4 cl, 5 dwg

FIELD: engines and pumps.

SUBSTANCE: control device of exit gas recirculation (EGR) for control of diesel engine includes EGR valve by means of which the engine EGR flow is controlled, suction air throttle valve by means of which the engine suction air flow is controlled, and the mechanism in which EGR valve opening is enabled in conjunction with the opening of air throttle valve. Each of the determining opening lines (characteristic curves) and with regard to opening of EGR valve and air throttle valve has dead zone section, where the flow rate remains unchanged, even when the valve opening increases above some opening limit. EGR control device is equipped with dead zone evaluation device that estimates excess air design factor λ considering the oxygen residue in EGR gas. The conclusion is made that at least one of EGR valves and air throttle valve is engaged in dead zone, on the basis of the rate of change of the estimated design factor λ of excess air when the rate of change of excess air design factor λ is less than the preset level. EGR control device is equipped with dead zone compensation device that makes the corrections concerning command signals of opening in relation to EGR valve and suction air throttle valve so that dead zones do not interfere with the mechanism concerning joint opening operation when evaluation device of dead zone makes a conclusion that at least one of EGR valves and air throttle valve is engaged in dead zone and the engine is in the condition of transient process.

EFFECT: simpler control of the valve opening.

7 cl, 12 dwg

FIELD: internal combustion engine.

SUBSTANCE: invention considers spark ignition internal combustion engines. The internal combustion engine includes variable compression mechanism, the mechanism of valve timing adjustment, and throttle gate and catalyst and temperature predicative tool of the catalyst. Catalyst is placed in the outlet port of the engine. When engine load becomes lower, the mechanical compression degree increases to the maximum mechanical compression value and induction valve timing is shifted from the lowest dead point of induction given that the catalyst is active. If it is predicted that in case of load lowering the catalyst temperature will fall below activation temperature, then reduction of mechanical compression degree, shift value of induction valve timing in a direction to lower dead point of induction and reduction in degree of throttle gate opening becomes larger to lower the degree of actual expansion simultaneously with supporting or increasing the actual compression degree.

EFFECT: ensuring catalyst temperature increase at the same time maintaining good conditions for combustion initiation.

3 cl, 25 dwg

FIELD: internal combustion engine.

SUBSTANCE: invention considers spark ignition internal combustion engines. The internal combustion engine contains the variable compression mechanism (A) which allows changing the degree of mechanical compression, and the mechanism (B) of valve timing adjustment, which allows changing the induction valve timing (7). The volume of induced air supplied to the combustion chamber (5), is controlled by means of changing the induction valve timing (7). Degree of mechanical compression increases to the maximum degree of mechanical compression when the volume of induced air supplied to the combustion chamber decreases. In this case the volume of induced air supplied to the combustion chamber (5) decreases when the induction valve timing (7) is moved from the dead point of induction to the limit valve timing. When the induction valve timing (7) reaches the limit valve timing, the volume of induced air into the combustion chamber (5) becomes the limit controlled amount of induced air controlled by the valve timing adjustment mechanism. When the volume of induced air into the combustion chamber (5), decreases additionally due to the limit controlled volume of induced air, induction valve timing (7) is kept at the limit valve timing. During acceleration, when the volume of induced air into the combustion chamber (5) is less than limit controlled volume of induced air, if required acceleration degree is higher than predefined degree, movement of the induction valve timing (7) starts from the limit valve timing in the direction approaching to the lower dead point of induction when the volume of induced air to the combustion chamber is less in comparison with that when required acceleration degree is lower than predefined degree.

EFFECT: acceleration increase.

4 cl, 15 dwg

FIELD: engines and pumps.

SUBSTANCE: proposed engine comprises variable compression ratio mechanism, variable phase distribution setter, and restrictor. With engine load decreasing, compression ratio increases to its maximum kept thereat in load zone lower than that of engine. Note here that intake valve closing setting displaces from BDC to maximum closing setting. With closing setting reaching maximum values, engine load is lower that load at which compression ratio reaches its maximum. Simultaneously, actual compression ratio downs gradually compared with engine high-load operation time. With intake valve closing setting reaches its maximum, amount of air intake is controlled by restrictor in the range of loads lower than that of engine whereat intake valve closing setting reaches its maximum. At loads lower the engine load when intake valves closing setting reaches its maximum, restrictor may be retained in completely open position.

EFFECT: permanent stable ignition.

3 cl, 12 dwg

FIELD: engines and pumps.

SUBSTANCE: internal combustion engine (ICE) with spark ignition includes regulated gas distribution phase mechanism, variable compression degree mechanism and throttle valve. Throttle valve is arranged in inlet ICE channel. When ICE load decreases from high to low, the closing moment of inlet valve is moved in the direction from lower dead inlet point. At low load operation of the engine the mechanical compression degree is kept maximum. At high load operation of the engine, the mechanical compression degree increases when the engine load becomes lower; at that, actual compression degree remains constant. Pre-determined load is set within the range of load where mechanical compression degree is kept maximum. Throttle valve is retained in fully opened state in the area between high and pre-determined (L2) loads. When engine load becomes lower, the opening degree of throttle valve becomes lower and opening moment of inlet valve moves in the direction from upper dead inlet point. In the load area, where mechanical compression degree is kept maximum, actual compression degree becomes lower when the engine load decreases.

EFFECT: improving combustion process allowing to obtain high thermal efficiency.

2 cl, 11 dwg

FIELD: engines and pumps.

SUBSTANCE: internal combustion engine (ICE) with spark ignition includes variable compression degree mechanism and mechanism for adjustment of gas distribution phases. Variable compression degree mechanism has the possibility of changing mechanical compression degree. Gas distribution phase control mechanism has the possibility of controlling the inlet valve closing moment. Mechanical compression degree in working range of low load, excluding idle operation, is more than during the operation at high load. Mechanical compression degree during idle operation becomes lower than for working range of low load. When engine operation is switched over to idle mode, mechanical compression degree can be decreased gradually.

EFFECT: reducing vibration and noise caused by the engine during idle operation.

9 cl, 13 dwg

FIELD: engines and pumps.

SUBSTANCE: internal combustion engine (ICE) with spark ignition includes compression degree control mechanism, gas distribution phase control mechanism and throttle valve. When load on ICE becomes lower, the closing moment of inlet valve is shifted aside from lower dead point of suction stroke, and mechanical compression degree increases to maximum. At engine operation in range of loads that are lower than engine load at which mechanical compression degree becomes maximum, mechanical compression degree is maintained as maximum load, and actual compression degree decreases. On engine operation side with high load the mechanical compression degree decreases gradually when the load increases. When engine load becomes lower, inlet valve is shifted from lower dead point of inlet stroke. When engine load decreases on engine operation side with low load, actual compression degree decreases; at that, throttle gate closes.

EFFECT: providing favourable conditions for fuel ignition and combustion and improving thermal effectiveness.

5 cl, 11 dwg

FIELD: engines and pumps.

SUBSTANCE: internal combustion engine (ICE) with spark ignition includes regulated gas distribution phase mechanism, variable compression degree mechanism and throttle valve. Regulated gas distribution phase mechanism has the possibility of regulating the setting of inlet valve closing moment. Variable compression degree mechanism has the possibility of changing mechanical compression degree. At negative pressure in ICE inlet valve, which is lower than the required negative pressure, throttle valve opening degree is set to lower value. At lower throttle valve opening degree in the inlet valve there shall be set the required negative pressure or bigger negative pressure. At setting of the required or bigger negative pressure in inlet valve the setting of closing moment of inlet valve shifts in the direction close to lower inlet dead-point. Volume of intake air, which corresponds to the engine load, is supplied to combustion chamber in compliance with throttle valve opening degree. At that, mechanical compression degree is set to lower value in order to reduce the pressure at the end of compression.

EFFECT: providing the possibility of creating big negative pressure in inlet engine channel during ICE operation at low loads.

10 cl, 13 dwg

FIELD: engines and pumps.

SUBSTANCE: invention relates to automotive industry. Signal is processed in compliance with the first logical circuit when engine runs in the first intake mode and in compliance with the second logical circuit when it runs in the second intake mode. The first intake mode is characterised by actuation of high-pressure EGR valve. The second intake mode is characterised by actuation of low-pressure EGR valve.

EFFECT: higher accuracy of airflow rate measurement.

10 cl, 9 dwg

FIELD: transport.

SUBSTANCE: invention relates to transport and can be used for evaluation fresh air mass Ma entering combustion chamber of engine cylinder. According to the invention, during engine cycle the evaluation (128) of total mass Mtot, of gas contained in combustion chamber is performed at the end of fresh air inflow, the evaluation (120, 124) of mass of burnt gases contained in combustion chamber is performed at the end of burnt gas outflow, and the evaluation (128) of fresh air mass Ma is performed from difference between evaluated total mass Mtot and burnt gas mass Mb.

EFFECT: higher accuracy of fresh air mass evaluation which air enters engine cylinder combustion chamber.

13 cl, 3 dwg

FIELD: engines and pumps.

SUBSTANCE: additionally defined is used oxygen preset concentration ([O2]spEM) indicating oxygen concentration in exhaust pipe. Computed is reference magnitude (Airreference) of air as a function of preset concentration ([O2]spEM). Defined is oxygen concentration ([O2]fdIM, [O2]fdEM) in return circuit indicating oxygen concentration in engine. Actual fresh airflow rate 1 and reference magnitude (Airreference) of air are compared to obtain data on position of choke 10. Besides, in compliance with proposed method, return circuit oxygen concentration ([O2]fdIM, [O2]fdEM) and preset concentration ([O2]spEM) are compared to obtain data on the position of waste gas circulation valve 16. Finally, choke 10 and waste gas circulation valve 16 are controlled in compliance with appropriate info on their position.

EFFECT: perfected method.

FIELD: engines and pumps.

SUBSTANCE: proposed method is intended for engine equipped with air intake system 2 including intake pipe 4 and valves 6 to control flow rate of air fed into pipe 4. Proposed method comprises realisation of first algorithm based on Sen-Venan model and second algorithm based on "filling-emptying" model for definition of first (MAF_SV) and second (MAF_FF) magnitudes of air flow rate at inlet of said pipe. It comprises also selecting first airflow rate (MAF_SV) in case relationship (β) between pressures (pup, pdown) at inlet and outlet of said valves are lower than preset threshold magnitude βtsh varying from 0.9 to 0.95, and selecting second airflow rate (MAF_FE) in case said relationship (β) between pressures (pup, pdown) at inlet and outlet of said valves are higher than said threshold βtsh. Invention covers also ICE implementing above described method.

EFFECT: higher accuracy of air flow rate measurement.

10 cl, 2 dwg

FIELD: engines and pumps.

SUBSTANCE: invention refers to a diagnostics method of the state of a fuel feed system of internal combustion engine (1) with controlled ignition and with fuel spray, which contains electronic control device (6) using oxygen sensor (8) for control in a closed loop of the value of air/fuel ratio in the mixture supplied to combustion chambers of the above engine, according to which a signal supplied with the above oxygen sensor is analysed; at that, a) change of time of effective spray is derived from the above signal and saturation of exhaust gas at the engine outlet is controlled; b) CRITERE = ∫ (CRITERE1+CRITERE2+CRITERE3) is calculated; c) CRITERE is compared to the pre-determined threshold values, minimum SEUIL_MIN and maximum SEUIL_MAX; d) malfunction state is stated when CRITERE is beyond the interval concluded between SEUIL_MIN and SEUIL_MAX.

EFFECT: improving operating efficiency of the internal combustion engine; reducing the quantity of pollutants at the outlet header outlet of the transport vehicle.

7 cl, 11 dwg

FIELD: engines and pumps.

SUBSTANCE: object of this invention is a diagnostics method of the state of a fuel feed system of internal combustion engine (1) with controlled ignition and with fuel spray, which contains electronic control device (6) using oxygen sensor (8) for control in a closed loop of the value of air/fuel ratio in the mixture supplied to combustion chambers of the above engine (1), according to which a signal supplied with the above oxygen sensor (8) is analysed; at that, a) spray time correction factor ALPHACL_MOYEN is derived from the above signal, by means of which saturation of exhaust gas at engine (1) outlet is controlled, b) ALPHACL_MOYEN is compared to the pre-determined threshold values: minimum SEUIL_MIN and maximum SEUIL_MAX; c) malfunction state is stated when ALPHACL_MOYEN is beyond the interval concluded between SEUIL_MIN and SEUIL_MAX.

EFFECT: improving operating efficiency of the internal combustion engine; reducing the quantity of pollutants at the outlet header outlet of the transport vehicle.

7 cl, 8 dwg

FIELD: engines and pumps.

SUBSTANCE: invention relates to method of controlling ICE. Proposed method consists in that filling of combustion chamber is determined with due allowance for pressure in suction duct and with the help of the help of model incorporating crankshaft rpm, pressure in suction duct vs ambient pressure and air temperature in combustion chamber as input values. Air temperature in combustion chamber if determined with the help of model incorporating recorded air temperature in suction duct and at least one recorder ICE temperature, e.g. cooling water temperature, exhaust gas temperature and/or cylinder head temperature, as input values. Invention covers also electrical data carrier for ICE control and/or adjustment device with written in computer program incorporating proposed method, as well as ICE control and/or adjustment device programmed to implement above described method.

EFFECT: optimum filling of combustion chamber with air by suction channel pressure.

12 cl, 6 dwg

FIELD: motors and pumps.

SUBSTANCE: electronic control unit being the part of control system calculates the first estimated amount of drawn-in air in accordance with height at which the valve is lifted. It is also calculated based on cam phase and a rate of compression. The second estimated amount of drawn-in air is calculated in accordance with air flow rate measured by air flow transmitter. The electronic control unit measures the amount of injected fuel according to the first estimated amount of the drawn-in air in case the estimated flow rate Gin-vt calculated based on engine shaft revolutions, cam phase and compression rate, is within Gin-vt≤Ginl, and in accordance with second estimated amount of drawn-in air in case the estimated flow rate is within Gin2≤Gin-vt.

EFFECT: increased accuracy of fuel flow rate control and ignition point in case calculated amount of drawn-in air is not reliable; possibility of reduced process costs.

11 cl, 34 dwg

FIELD: mechanical engineering; internal combustion engines.

SUBSTANCE: according to proposed method of control of internal combustion engine with air intake system, basing on at least one control value and at least one measured value characterizing condition of ambient air by means of one model, one value characterizing parameters of air intake system is determined. Said model consists of at least first and second submodels. Output values are determined by means of submodel basing on input values. Used as input values for first submodel, apart from at least one output value of second submodel, control value and measured value are taken into account. Used as control value taken into account is at least one value characterizing amount of injected fuel.

EFFECT: simplified design of control device.

17 cl, 8 dwg

FIELD: mechanical engineering; piston machines.

SUBSTANCE: proposed resonant piston machine with crank-and-connecting rod mechanism contains shaft angular velocity pickup, ambient temperature transmitter, ambient barometric pressure transmitter, supercharging air temperature transmitter, supercharging air pressure transmitter and microprocessor control system. Microprocessor control system contains, in its turn, with mathematical model of operation of resonant piston machine, first comparator unit and second comparator unit. Output signals from shaft angular velocity pickup, ambient temperature transmitter, ambient barometric pressure transmitter, supercharging air temperature transmitter and supercharging air pressure transmitter are fed to inputs of unit with mathematic model of operation of resonant piston machine. Calculated value of supercharging air pressure corresponding to resonant mode at measured values of temperature and barometric pressure of ambient air are fed to first input of first comparator unit. Output signal from supercharging air pressure transmitter is fed to second input of first comparator unit. Calculated value of supercharging air temperature corresponding to resonant of operation at said measured values of temperature and barometric pressure of ambient air are fed to first input of second comparator unit, and to second input, output signal from supercharging air temperature transmitter is applied. Signals from outputs of first and second comparator units are supplied to inputs of first and second actuating-and-regulating devices, respectively, smoothly changing the pressure and temperature of supercharging air to provided minimum irregularity factor of piston machine shaft rotation angular velocity. Meeting of this condition means that piston machine is in resonance.

EFFECT: provision of automatic maintenance of resonant mode of operation of piston machine, minimum angular velocity irregularity factor of piston machine shaft.

2 cl, 7 dwg

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