Removal determination device for exhaust gas purification device

A removal determination device for an exhaust gas purification device that determines a presence of the exhaust gas purification device in a casing formed on an exhaust pipe of an engine, comprising:

• an input temperature sensor that detects a temperature at an upstream side of the casing;
• an output temperature sensor that detects a temperature at a downstream side of the casing;
• and
• a controller that determines the presence of the exhaust gas purification device in the casing,
• wherein the controller comprises:
• an engine stop time collector that collects a time from a point at which the engine is stopped to a point at which the engine is started;
• and
• a determiner that determines the presence of the exhaust gas purification device in the casing based on an input temperature detected by the input temperature sensor and an output temperature detected by the output temperature sensor, in a case that the time from the point at which the engine is stopped to the point at which the engine is started is equal to or longer than a predetermined time,
• wherein the determiner is configured to determine that the exhaust gas purification device is arranged in the casing, in a case that a difference between:
• an integrated amount of the exhaust gas required to raise the input temperature to a first predetermined temperature from the startup of the engine;
• and an integrated amount of the exhaust gas required to raise the output temperature to the first predetermined temperature, is equal to or greater than a second threshold value, and
• wherein the controller is configured to change an operating condition of the engine when it is determined that the exhaust gas purification device is not in the casing.

A removal determination device for an exhaust gas purification device that determines a presence of the exhaust gas purification device in a casing formed on an exhaust pipe of an engine, comprising:

• an input temperature sensor that detects a temperature at an upstream side of the casing;
• an output temperature sensor that detects a temperature at a downstream side of the casing;
• and
• a controller that determines the presence of the exhaust gas purification device in the casing,
• wherein the controller comprises:
• an engine stop time collector that collects a time from a point at which the engine is stopped to a point at which the engine is started;
• and
• a determiner that determines the presence of the exhaust gas purification device in the casing based on an input temperature detected by the input temperature sensor and an output temperature detected by the output temperature sensor, in a case that the time from the point at which the engine is stopped to the point at which the engine is started is equal to or longer than a predetermined time,
• wherein the determiner is configured to determine that the exhaust gas purification device is arranged in the casing, in a case that a difference between:
• an integrated amount of the exhaust gas required to raise the input temperature from a second predetermined temperature to a third predetermined temperature;
• and an integrated amount of the exhaust gas required to raise the output temperature from the second predetermined temperature to the third predetermined temperature, is equal to or greater than a third threshold value, and
• wherein the controller is configured to change an operating condition of the engine when it is determined that the exhaust gas purification device is not in the casing.