Patent ID: 11873778
Assignee: KUBOTA CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A spark ignition type engine comprising:
a main intake-air passage; a throttle valve of the main intake-air passage; a bypass intake-air passage bypassing the throttle valve; an ISC valve of the bypass intake-air passage; and an electronic control device that controls an engine speed by adjusting an ISC valve opening degree;
an engine temperature sensor; and atmospheric pressure sensor,
wherein
as a detected engine temperature becomes lower, a base lower limit value of the ISC valve opening degree is increased to a fully open side, and
the base lower limit value is corrected to increase to the fully open side with an increase correction value based on a detected atmospheric pressure in an engine middle-high temperature range where the engine temperature exceeds a predetermined value, and in the increase correction, the increase correction value is increased to the fully open side as the detected atmospheric pressure becomes lower, and
the increase correction is prohibited in an engine low temperature range where the engine temperature is equal to or lower than the predetermined value.