The method of controlling an internal combustion engine with switchable cylinders

 

The invention can be used in control systems and control of internal combustion engines with switchable cylinders. The method of controlling an internal combustion engine with switchable cylinders consists of discontinuation of the fuel supply, thus evenly alternate non cylinders through each cycle of engine operation. Measure the temperature of the engine and the position of the gas pedal by using a position sensor air throttle and compare them with the given values. The supply of fuel is carried out, blocking the control signal, filed by the electronic control unit to the injectors. The lock is a logical device that is introduced in the gap of the electrical circuits between the electronic control unit and the injector and reading signals from the position sensors of the air throttle and the engine temperature. The technical result is to reduce the cooling of the cylinders, which reduces the negative effects of lower operating temperature, and uniform wear of the cylinder group. 2 Il., 1 PL.

The present invention relates to the field of Mashinostroenie cylinders.

Known way to disable parts of cylinders of the internal combustion engine, according to which disables the group of cylinders through a phased stop the flow of fuel to the injectors, and then turn off the gas distribution mechanism. Enabled disabled cylinders in reverse (patent of Russian Federation №2062341, publ. 20.06.1996).

The method does not provide a stepped power control depending on the load on the engine, which reduces the efficiency off the engine.

The known method of operation of the internal combustion engine with switchable cylinders (USSR author's certificate No. 1815377 publ. 15.05.1993), according to which stop the flow of fuel-air mixture in turning off the engine cylinders, the number of disabled cylinders is changed depending on the load on the engine.

This method does not take into account the temperature regime of the engine. The result of reducing the operating temperature of the engine is incomplete combustion. As a consequence, increases the concentration of aggressive resinous fractions and carbon formation on the piston, which leads to increased corrosion of engine parts and took the with a variable number of working cylinders (patent of Russian Federation №2032824 publ. 10.04.1995), according to which the cylinder is disconnected groups in a certain sequence and with a clock interval. The number of cylinders in the working group change depending on the temperature and speed conditions of the engine.

This way there are two major shortcomings. The first is that turning off the cylinders are cooled and the first duty cycle when enabled, are inefficient, resulting in increased fuel consumption and emissions of harmful substances from the exhaust gases. When disconnecting the cylinder in one cycle cooling slightly, so the negative consequences of reducing the operating temperature is negligible. Disabling cylinder more than one cycle entails the increase of negative consequences. The exact setting of the timer to ensure cyclic disable cylinders with their alternation is strictly through one cycle is impossible, because the duration of a work cycle of the engine is changed during the operation. The second drawback is that the total time of operation of each cylinder of the engine without disconnecting different, therefore the wear on the cylinders of the engine is uneven. In the disabled cylinder wear of the cylinder group less so casnova of the invention is to improve the efficiency disable parts of cylinders of the internal combustion engine at partial load and idling.

The problem is solved in that in the method of controlling an internal combustion engine with switchable cylinders, namely, that stop the supply of fuel evenly alternating non cylinders through each cycle of operation of the engine, measure the temperature of the engine and the position of the gas pedal by using a position sensor air throttle and compare them with the given values, blocking the signal voltage applied by the electronic control unit to the injectors, a logical device, introduced in the gap of the electrical circuits between the electronic control unit and the injector and reading signals from the position sensors of the air throttle and the engine temperature. That is, cylinder shut-off is made for “traveling wave” without repetitions of rooms off cylinder two cycle engine (1440rotation of the crankshaft).

The implementation of this method, consider a four-cylinder gasoline internal combustion engine equipped with a distribution system of fuel injection and the order of cylinders 1-3-4-2 (ZMZ-4062).

In this example, the accelerator pedal position is determined using a sensor which was 1 shows a control circuit of the power supply system of the internal combustion engine.

In Fig.2A and b presents the design options control the operation of the injectors.

The control circuit of power supply system of the internal combustion engine includes standard engine management system electronic control unit (ECU), sensors, actuators) and put into the gap of the electrical circuit between ECU and injectors logical unit (LU) that is designed to read signals from the position sensors of the air throttle and the engine temperature, and depending on the values of these signals passes a control signal which is fed ECU to the injectors. In LU programmed certain control circuit of Fig.2A and b. The control circuit different (different frequency and order of outages). For example, in Fig.2A the shutdown routine will be called “1 through 4”, that is, every fifth control signal sent from the ECU to the injectors is blocked LU, and therefore the nozzle, which falls this signal does not open. So, in this cylinder comes only air without fuel and it skipped the combustion process (cylinder off). In Fig.2B program off - “1 in 2”, that is, each third signal will be blocked LU. It should be noted, Corey uneven torque will be minimal.

Internal combustion engine with switchable cylinders will operate as follows (see table): if the engine temperature is below operating temperature, the logical unit does not influence the operation of the injectors, and the engine is running without shutting down cylinders; reaching the sensor signal, the engine temperature threshold, and the corresponding signal of the position sensor air throttle logic device implements one of the circuits control the operation of the injector (Fig.2A or b); if the throttle the idle, the control circuit of the injectors shown in Fig.2B, if a partial loads, Fig.2A.

Thus, the disabling of each of the cylinders of the engine is not more than one pass of combustion, so the cylinders are cooled slightly and the negative consequences of reducing the operating temperature is negligible, and the total time off each cylinder will be the same, so the wear of the cylinder group of the engine cylinders will be uniform.

Claims

The method of controlling the internal combustion engine is of indraw through each cycle of operation of the engine, characterized in that the measured temperature of the engine and the position of the gas pedal by using a position sensor air throttle and compare them with the given values, blocking the control signal, filed by the electronic control unit to the injectors, a logical device, introduced in the gap of the electrical circuits between the electronic control unit and the injector and reading signals from the position sensors of the air throttle and the engine temperature.

 

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