Patent ID: 11875616
Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
Field: Control (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A vehicle state monitoring device, comprising:
a memory configured to store information relating to a vehicle traveling under power from an engine; and
a processor configured to
store, in the memory, a first time series of values representing revolutions of the engine and a second time series of values representing a fuel-related parameter that is a load factor or a fuel injection rate of the engine while the vehicle travels a predetermined distance;
store a frequency relation as the information in the memory each time the vehicle travels the predetermined distance, the frequency relation being a relation between the revolutions of the engine, the fuel-related parameter, and a running frequency of the engine at the revolutions of the engine and the fuel-related parameter while the vehicle travels the predetermined distance;
store an altitude relation in the memory each time the vehicle travels the predetermined distance, the altitude relation being a relation between the revolutions of the engine, the fuel-related parameter, and an average value of altitude of the vehicle at a current location when the engine is running at the revolutions of the engine and the fuel-related parameter;
clear the first time series of values and the second time series of values from the memory in response to storing the frequency relation;
determine a state of the vehicle using the information stored in the memory; and determine whether a deposit of a predetermined amount or more is accumulated on a piston of the engine, using
a portion of the frequency relation including running frequencies of the engine at revolutions of the engine equal to or greater than a predetermined revolutions value and fuel-related parameters equal to or less than a predetermined parameter value, and
a portion of the altitude relation including average values of altitude of the vehicle when the engine is running at revolutions of the engine equal to or greater than the predetermined revolutions value and fuel-related parameters equal to or less than the predetermined parameter value.