US 12,215,642 B2
Compression ignition engine control
Rajesh Rajamani, Saint Paul, MN (US); and Woongsun Jeon, Seoul (KR)
Assigned to Regents of the University of Minnesota, Minneapolis, MN (US)
Filed by Regents of the University of Minnesota, Minneapolis, MN (US)
Filed on Sep. 12, 2023, as Appl. No. 18/465,387.
Claims priority of provisional application 63/375,344, filed on Sep. 12, 2022.
Prior Publication US 2024/0093653 A1, Mar. 21, 2024
Int. Cl. F02D 35/02 (2006.01); F02D 41/06 (2006.01)
CPC F02D 35/023 (2013.01) [F02D 35/027 (2013.01); F02D 41/062 (2013.01); F05D 2270/334 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An engine system, comprising:
an engine controller;
a compression ignition (CI) engine connected to the engine controller, the CI engine configured to receive engine control signals from the engine controller and to transmit current engine operating condition measurements to the engine controller, the CI engine having an engine block, the current engine operating condition measurements including angular position information; and
a vibration sensor placed proximate to the engine block,
wherein the engine controller comprises at least one processor configured to:
receive a vibration signal from the vibration sensor;
determine a non-combustion component of the vibration signal indicative of vibrations in the engine block not caused by combustion;
determine a combustion component of the vibration signal based on the non-combustion component of the vibration signal and the vibration signal, wherein the combustion component of the vibration signal is indicative of vibrations in the engine block caused by combustion;
determine an in-cylinder pressure based on the angular position information for a current cycle of the CI engine and on the combustion component of the vibration signal; and
generate revised engine control signals for a next cycle of the CI engine based on the determined in-cylinder pressure.