US 11,835,001 B1
Engine control system
Takeaki Kudo, Aki-gun (JP); Junki Hori, Aki-gun (JP); Masatoshi Seto, Aki-gun (JP); Tatsuya Fujikawa, Aki-gun (JP); and Masahisa Yamakawa, Aki-gun (JP)
Assigned to Mazda Motor Corporation, Hiroshima (JP)
Filed by Mazda Motor Corporation, Hiroshima (JP)
Filed on Mar. 23, 2023, as Appl. No. 18/188,911.
Claims priority of application No. 2022-084251 (JP), filed on May 24, 2022.
Int. Cl. F02D 13/02 (2006.01); F02D 41/40 (2006.01); F02P 5/15 (2006.01); F02P 5/04 (2006.01); F02D 41/38 (2006.01)
CPC F02D 13/0219 (2013.01) [F02D 13/0215 (2013.01); F02D 13/0261 (2013.01); F02D 13/0265 (2013.01); F02D 41/40 (2013.01); F02P 5/045 (2013.01); F02P 5/1502 (2013.01); F02D 2041/389 (2013.01); F02D 2200/021 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A control system for an engine provided with an engine body where a combustion chamber is formed, a fuel supply device configured to supply fuel to the combustion chamber, an intake valve configured to open and close an intake port configured to introduce intake air into the combustion chamber, and an exhaust valve configured to open and close an exhaust port configured to draw exhaust gas from the combustion chamber, the control system comprising:
an intake valve phase variable device configured to change a phase of the intake valve;
an exhaust valve phase variable device configured to change a phase of the exhaust valve; and
a control device configured to control the fuel supply device, the intake valve phase variable device, and the exhaust valve phase variable device, the control device being configured to:
when a first condition in which a temperature of the engine is below a given first determination temperature is satisfied, control the exhaust valve phase variable device so that a close timing of the exhaust valve is at or retarded from an exhaust top dead center, control the intake valve phase variable device so that an open timing of the intake valve is retarded from the close timing of the exhaust valve, and control the fuel supply device so that the fuel supply to the combustion chamber is started in an intake stroke on a retarding side of the close timing of the exhaust valve; and
when a second condition in which the engine temperature is above the first determination temperature and below a given second determination temperature is satisfied, control the intake valve phase variable device and the exhaust valve phase variable device so that a negative overlap in which the exhaust valve and the intake valve are both closed during a given period including the exhaust top dead center occurs, or so that a positive overlap in which the exhaust valve and the intake valve are both opened during a given period including the exhaust top dead center occurs, wherein
the engine is coupled to a generator configured to generate power by being driven by the engine, and
the control device controls the generator so that a power generating amount of the generator is greater when the first condition is satisfied than when the second condition is satisfied.