Patent ID: 8919107

Claim:
A control device of a diesel engine with a turbocharger including an engine body having a cylinder to which fuel containing diesel fuel as its main component is supplied, a fuel injection valve for injecting the fuel into the cylinder, a turbine of the turbocharger provided within an exhaust passage through which exhaust gas is discharged from the cylinder, a bypass passage for bypassing the turbine, a bypass valve for opening and closing the bypass passage, an oxidation catalyst arranged within the exhaust passage downstream of the turbine and the bypass passage, and for purifying HC contained within the exhaust gas, and a DPF arranged within the exhaust passage downstream of the oxidation catalyst and for capturing soot contained within the exhaust gas, the device comprising: a fuel cutting module executed on a microprocessor for stopping, when the diesel engine is in a deceleration state, a main injection of the fuel that is performed on compression stroke of the cylinder; a DPF regenerating module executed on the microprocessor for performing, when a predetermined DPF regeneration condition is satisfied, a post injection on expansion stroke of the cylinder to supply HC to the oxidation catalyst and regenerate the DPF by heat generated from an oxidation reaction of HC; and a bypass valve control module executed on the microprocessor for controlling the bypass valve, wherein when the diesel engine is in the deceleration state and the predetermined DPF regeneration condition is not satisfied, the bypass valve control module controls the opening of the bypass valve to its predetermined opening to an extent less than an opening of the bypass valve when the diesel engine is in the deceleration state and the predetermined DPF regeneration condition is satisfied; wherein when the diesel engine is in the deceleration state and the predetermined DPF regeneration condition is satisfied, the bypass valve control module controls the bypass valve to open to an extent more than an opening of the bypass valve when the diesel engine is in the deceleration state and the predetermined DPF regeneration condition is not satisfied.