In-vehicle control device

An in-vehicle control device that is included in a vehicle that is equipped with an internal combustion engine, an automatic transmission, and a torque converter having an input shaft that is connected to a crankshaft of the internal combustion engine, an output shaft that is connected to the automatic transmission, and a lockup clutch that is provided between the input shaft and the output shaft, wherein

• the internal combustion engine has a fuel injection valve that supplies fuel to a cylinder, and a filter that is provided in an exhaust passage to collect particulate matter in exhaust gas, and
• the torque converter has a pump impeller that is provided on the input shaft, and a turbine impeller that is provided on the output shaft to transmit a torque between the turbine impeller and the pump impeller via a fluid, the in-vehicle control device comprising:
• a processor configured to
• perform a fuel cut-off process for carrying out fuel cut-off to stop fuel injection from the fuel injection valve when a prescribed fuel cut-off condition occurs, the prescribed fuel cut-off condition including engagement of the lockup clutch is engaged and an accelerator that is off, the filter in the exhaust passage being heated to remove particulate matter during the fuel cut-off process,
• perform a fuel cut-off suspension process for carrying out fuel injection from the fuel injection valve and releasing the lockup clutch when there is a request to suspend the fuel cut-off with the accelerator off, and
• perform a speed increase process for performing shift control of the automatic transmission such that a rotational speed of the turbine impeller becomes higher while the fuel cut-off suspension process is performed than when the fuel cut-off is carried out.