Controlled engine shutdown method and engine shutdown prediction for exhaust system durability

摘要

A controlled engine shutdown method is disclosed that includes monitoring exhaust system temperature, monitoring operator shutdown commands, and delaying engine shutdown based on exhaust system temperature. The method can include inhibiting any process that affects exhaust temperatures, for example DPF regeneration. The method can use a shutdown timer, allow operator override of the shutdown delay, and display a delay notification message. The method can also include predicting when an engine shutdown is expected, and delaying or aborting any process that would affect exhaust temperatures when an engine shutdown is predicted. Predicting can include monitoring various machine states, determining an average activity interval for the machine, determining a geographic shutdown area, determining a shutdown time of day and/or monitoring a machine fluid level.

主权项

1. A controlled engine shutdown method for a machine having an engine and an exhaust system, the controlled engine shutdown method comprising:
monitoring an exhaust system temperature; monitoring operator commands including an engine shutdown command; setting a shutdown timer to a timer start value when the exhaust system temperature exceeds a temperature threshold and the operator has not issued the engine shutdown command; not counting down the shutdown timer when the exhaust system temperature exceeds the temperature threshold and the operator has not issued the engine shutdown command; resetting the shutdown timer to zero when the exhaust system temperature goes below the temperature threshold and the operator has not issued the engine shutdown command; delaying engine shutdown when the operator issues the engine shutdown command based on the shutdown timer and whether the exhaust system temperature exceeds the temperature threshold; if the engine shutdown is delayed, aborting any current process of the machine affecting exhaust temperatures to decrease the exhaust system temperature more rapidly; if the shutdown timer is zero when the operator issues the engine shutdown command, not delaying the engine shutdown; and if the shutdown timer is greater than zero when the operator issues the engine shutdown command, counting down the shutdown timer and delaying the engine shutdown until the shutdown timer counts down to zero.