CONTROL SYSTEM FOR COMPRESSION IGNITION ENGINE, METHOD OF CONTROLLING COMPRESSION IGNITION ENGINE, COMPUTER PROGRAM PRODUCT AND COMPRESSION IGNITION ENGINE
FIG14 is a flowchart illustrating a control according to the change from Layer 2 to Layer 3
FIG14 illustrates a flowchart according to the change from Layer 2 to Layer 3. At Step S141, the ECU 10 first reads the signals of the sensors SW1-SW17, and at the subsequent Step S142, the ECU 10 determines whether the change from Layer 2 to Layer 3 is necessary. Returning to the flowchart of FIG14, at Step S1410, the ECU 10 determines whether the calculated rich limit torque is not in agreement with the target torque. If the determination is YES (i.e., if the calculated rich limit torque is not in agreement with the target torque), the process shifts to Step S1411. On the other hand, if the determination is NO (i.e., if the calculated rich limit torque is in agreement with or substantially in agreement with the target torque), the process shifts to Step S1417.
flowchart
44
supercharger
17
combustion chamber combustion chambers
14
about through respective connecting rods
3
Layer
['1. A control system for a compression ignition engine (1), comprising: a combustion chamber (17) of the engine (1) defined by a cylinder (11), a piston (3) configured to reciprocate inside the cylinder (11), and a cylinder head (13) closing one end of the cylinder (11); a throttle valve (43) configured to adjust an amount of air filled up in the combustion chamber (17); an injector (6) attached to the cylinder head (13) and configured to inject fuel to be supplied into the combustion chamber (17); an ignition plug (25) disposed so as to be oriented in the combustion chamber (17) and configured to ignite mixture gas inside the combustion chamber (17); a swirl control valve (56) configured to generate a swirl flow inside the combustion chamber (17); at least one sensor (SW1-SW17) configured to measure a parameter related to an operation of the engine (1); and a controller (10) having a circuitry connected with the throttle valve (43), the injector (6), the ignition plug (25), the swirl control valve (56), and the at least onesensor (SW1-SW17), configured to perform a calculation in response to a measurement signal from the sensor (SW1-SW17) and output signals to the throttle valve (43), the injector (6), the ignition plug (25), and the swirl control valve (56), wherein the controller (10) is configured to execute a first mode module (10b) to operate the engine (1) in a first mode, a second mode module (10c) to operate the engine (1) in a second mode, and a changing module (10e) to change the mode from the first mode to the second mode or from the second mode to the first mode in response to a change demand, wherein the first mode module (10b) outputs the signals to the injector (6) and the throttle  valve (43) so that a fuel amount becomes an amount according to a load of the engine (1) and an air-fuel ratio of the mixture gas becomes a first air-fuel ratio, and outputs an ignition signal to the ignition plug (25) so that a part of the mixture gas starts combustion accompanied by flame propagation due to a forcible ignition of the ignition plug (25), and remaining unburnt mixture gas then combusts by self-ignition, wherein the second mode module (10c) outputs the signals to the injector (6) and the throttle valve (43) so that the fuel amount becomes the amount according to the load of the engine (1) and the air-fuel ratio of the mixture gas becomes a second air-fuel ratio higher than the first air-fuel ratio, and outputs the ignition signal to the ignition plug (25) so that a part of the mixture gas starts combustion accompanied by flame propagation due to a forcible ignition of the ignition plug (25), and remaining unburnt mixture gas then combusts by self-ignition, wherein the changing module (10e) outputs the signals to the throttle valve (43) and the injector (6) in response to the change demand so that the air-fuel ratio of the mixture gas becomes a stoichiometric air-fuel ratio or a substantially stoichiometric air-fuel ratio, and outputs the signal to the swirl control valve (56) so that the swirl flow becomes stronger than before the change demand when changing from the first mode to the second mode and that the swirl flow becomes weaker than before the change demand when changing from the second mode to the first mode, and wherein when the swirl flow is determined to be reached a given strength, the changing module (10e) causes the second mode module (10c) to start the second mode when changing from the first mode to the second mode and/or the changing module (10e) causes the first mode module (10b) to start the first mode when changing from the second mode to the first mode.', '3. The control system of claim 1 or 2, wherein the swirl control valve (56) generates a flow  having a swirl ratio of about 4:1 or higher.']