Method for restricting work produced by a combustion engine

A computer program product comprising program code stored on a non-transitory computer-readable medium, said computer program product for restricting work produced by combustion in at least one combustion chamber, wherein an aftertreatment system is arranged for reduction of at least one substance resulting from said combustion, wherein the work produced by said combustion is restricted when there is a malfunction regarding reduction of said at least one substance, said computer program product comprising computer instructions to cause one or more computer processors to perform the following operations:

• performing a first evaluation regarding the reduction of said at least one substance;
• when said first evaluation indicates a malfunction, performing a second evaluation regarding the reduction of said at least one substance, said second evaluation being different from said first evaluation;
• and
• restricting work produced by said combustion only when a malfunction regarding reduction of said at least one substance is indicated also by said second evaluation.

A system for restricting work produced by combustion in a combustion chamber, wherein an aftertreatment system is arranged for reduction of at least one substance resulting from said combustion, wherein the work produced by said combustion is restricted when there is a malfunction regarding reduction of said at least one substance, the system comprising:

• means for performing a first evaluation regarding the reduction of said at least one substance;
• when said first evaluation indicates a malfunction, means for performing a second evaluation regarding the reduction of said at least one substance, said second evaluation being different from said first evaluation;
• and
• means for restricting work produced by said combustion only when a malfunction regarding reduction of said at least one substance is indicated also by said second evaluation.

A vehicle comprising a system for restricting work produced by combustion in a combustion chamber, wherein an aftertreatment system is arranged for reduction of at least one substance-resulting from said combustion, wherein the work produced by said combustion is restricted when there is a malfunction regarding reduction of said at least one substance, the system comprising:

• means for performing a first evaluation regarding the reduction of said at least one substance;
• when said first evaluation indicates a malfunction, means for performing a second evaluation regarding the reduction of said at least one substance, said second evaluation being different from said first evaluation;
• and
• means for restricting work produced by said combustion only when a malfunction regarding reduction of said at least one substance is indicated also by said second evaluation.