CONTROL SYSTEM FOR COMPRESSION IGNITION ENGINE, METHOD OF CONTROLLING COMPRESSION IGNITION ENGINE, COMPUTER PROGRAM PRODUCT AND COMPRESSION IGNITION ENGINE
FIG13 is a view illustrating one example of a configuration of a functional block of an ECU, according to the changing between Layer 2 and Layer 3
FIG13 illustrates a configuration of the functional blocks of the ECU 10. The functional block illustrated in FIG13 mainly relates to the changing between Layer 2 and Layer 3. The functional blocks include a target torque setting module 10a, a first mode module 10b, a second mode module 10c, a determining module 10d, and a changing module 10e. The ECU 10 is configured to execute the various software modules stored in the memory 102 to perform their respective functions, as described below.
view
56
swirl control valve
25
ignition plug ignition plugs
57
alternator
10
ECU
43
throttle valve
54
EGR valve
13
cylinder head
['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.']