US 12,234,786 B2
Engine control device and engine device
Michisuke Iga, Sakai (JP); Tomotaka Tanaka, Sakai (JP); Kosuke Aoki, Sakai (JP); Hiroyuki Kawasoe, Sakai (JP); and Kengo Hidaka, Sakai (JP)
Assigned to KUBOTA CORPORATION, Osaka (JP)
Filed by KUBOTA CORPORATION, Osaka (JP)
Filed on May 14, 2024, as Appl. No. 18/663,584.
Claims priority of application No. 2023-083414 (JP), filed on May 19, 2023.
Prior Publication US 2024/0384692 A1, Nov. 21, 2024
Int. Cl. F02D 41/22 (2006.01); B60K 17/02 (2006.01); B60K 17/08 (2006.01); F02D 41/00 (2006.01); F02D 41/40 (2006.01)
CPC F02D 41/22 (2013.01) [F02D 41/0002 (2013.01); F02D 41/401 (2013.01); B60K 17/02 (2013.01); B60K 17/08 (2013.01); F02D 2041/227 (2013.01); F02D 2200/0404 (2013.01); F02D 2200/0614 (2013.01); F02D 2200/101 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An engine control device to control an engine equipped with an electronic throttle mechanism and a fuel injection mechanism, comprising:
a revolution speed detection unit that detects revolution speed of the engine; and
an arithmetic unit that calculates an opening of a throttle valve opened by the electronic throttle mechanism, and an injection amount of fuel injected by the fuel injection mechanism, wherein
the electronic throttle mechanism includes a valve rotation mechanism unit that rotates the throttle valve, and
the valve rotation mechanism unit is configured to set the throttle valve at a mechanically neutral position in a case where electronic control of the electronic throttle mechanism is disabled,
the valve rotation mechanism unit has a tolerance from the neutral position of the throttle valve in a rotating direction, and
a reference position of the valve rotation mechanism unit installed in the engine is set so that the revolution speed of the engine detected by the revolution speed detection unit becomes at least a lower limit revolution speed that is a minimal speed at which self-traveling in a limp home mode is possible, even if the tolerance from the neutral position of the throttle valve is at the maximum tolerance on the side of closing the throttle valve,
in an operation of the engine in the limp home mode, in a case where the revolution speed of the engine detected by the revolution speed detection unit exceeds a predetermined limiting value, the arithmetic unit performs an operation to suppress injection of the fuel to be injected by the fuel injection mechanism, and
the limiting value of the revolution speed for suppressing the injection is set between the lower limit revolution speed and an upper limit revolution speed that is a maximum speed with which a driving gear to transmit output of the engine is engageable in a state where a clutch in a subsequent stage of the engine is connected.