Tire pneumatic pressure estimating apparatus

A tire pressure estimating system comprising:

• wheel speed detecting means for detecting a rotational speeds of vehicle wheels;
• pressure estimating means for estimating a discrete-time model modeling distribution of vibration of said tires, including a resonance component related to tire pressure, said discrete-time model being expressed as one of a linear and a non-linear combination of a plurality of rotational speeds detected by said wheel speed detecting means;
• and
• pressure determining means for determining one of said tire pressure and abnormality of said tire based on said resonance frequency estimated by said discrete-time model.

A tire pressure estimating system comprising:

• wheel speed detecting means for detecting a rotational speed of a vehicle wheel and for generating a signal representative thereof, said signal including a component of vibration input to be received by the vehicle wheel;
• estimating means for estimating a parameter of a predetermined linear estimation model modeling frequency distribution of tire vibration, including a resonant component, in relation to tire pressure, based on said signal;
• and
• pressure determining means for determining at least one of tire pressure and abnormality of said tire based on the parameter.

A tire pressure estimating system comprising:

• wheel speed detecting means for detecting a rotational speeds of vehicle wheels;
• estimating means for estimating a parameter of a discrete-time model modeling a frequency distribution of vibration of said tires, including a resonance component related to tire pressure, said discrete-time model being expressed as one of a linear and a non-linear combination of a plurality of rotational speeds detected by said wheel speed detecting means;
• and
• pressure determining means for determining at least one of said tire pressure and abnormality of said tire based on said estimated parameter.

A tire pressure estimating system comprising:

• wheel speed detecting means for detecting a rotational speed of a vehicle wheel including a component of vibration provided to a tire of said wheel and for generating a signal representative thereof;
• calculating means for calculating a linear estimation model representative of a frequency distribution of tire vibration of said tire, said distribution including a resonance component related to tire pressure of said tire, based on said rotational speed signal;
• and
• pressure determining means for at least one of determining abnormality of said tire pressure and estimating said tire pressure based on the resonance frequency which is decided by said linear estimation model.

A tire pressure estimating system comprising:

• wheel speed estimating means for detecting a rotational speed of a vehicle wheel including a component of vibration provided to a tire of said wheel and for generating a signal representative thereof;
• calculating means for calculating a discrete-time model representative of a frequency distribution of tire vibration of said tire, said distribution including a resonance component related to tire pressure, said discrete-time model being expressed as one of a linear combination and a non-linear combination of a plurality of rotational speed signals detected by said wheel speed detecting means;
• and
• pressure determining means for determining abnormality of said tire pressure or estimating said tire pressure based on the resonance frequency which is decided by said linear estimation model.

A tire pressure estimating system comprising:

• wheel speed estimating means for detecting a rotational speed of a vehicle wheel including a component of vibration provided to a tire of said wheel and for generating a signal representative thereof;
• calculating means for calculating a parameter of a linear estimation model representative of a frequency distribution of tire vibration of said tire, said distribution including a resonance component related to tire pressure of said tire, based on said rotational speed signal;
• and
• pressure determining means for at least one of determining abnormality of said tire pressure and estimating said tire pressure based on the parameter calculated by said calculating means.

A tire pressure estimating system comprising:

• wheel speed estimating means for detecting a rotational speed of a vehicle wheel including a component of vibration provided to a tire of said wheel and for generating a signal representative thereof;
• calculating means for calculating a parameter of a discrete-time model representative of a frequency distribution of tire vibration of said tire, said distribution including a resonance component related to tire pressure of said tire, said discrete-time model being expressed as one of a linear and a non-linear combination of a plurality of rotational speed signals detected by said wheel speed detecting means;
• and
• pressure determining means for at least one of determining abnormality of said tire pressure and estimating said tire pressure based on the parameter calculated by said calculating means.

A tire pressure estimating system comprising:

• wheel speed estimating means for detecting a rotational speed of a vehicle wheel including a component of vibration provided to a tire of said wheel and for generating a signal representative thereof;
• calculating means for calculating a predetermined mathematical expression model representative of tire vibration of said tire using a linear estimation method and said signal of said wheel speed detecting means;
• estimating means for estimating a resonance frequency of said tire based on the calculated mathematical expression model;
• and
• pressure determining means for determining abnormality of said tire pressure or estimating said tire pressure based on the resonance frequency which is estimated by estimating means.

A tire pressure estimating system comprising:

• wheel speed estimating means for detecting a rotational speed of a vehicle wheel including a component of vibration provided to a tire of said wheel and for generating a signal representative thereof;
• calculating means for calculating a predetermined mathematical expression model representative of tire vibration of said tire using a discrete-time method and one of a linear and non-linear combination of a plurality of rotational speed signal detected by said wheel speed detecting means;
• estimating means for estimating a resonance frequency of said tire based on the calculated mathematical expression model;
• and
• pressure determining means for determining abnormality of said tire pressure or estimating said tire pressure based on the resonance frequency which is estimated by estimating means.

A tire pressure estimating system comprising:

• wheel speed estimating means for detecting a rotational speed of a vehicle wheel including a component of vibration provided to a tire of said wheel and for generating a signal representative thereof;
• calculating means for calculating a parameter of a predetermined mathematical expression model representative of tire vibration of said tire using a linear estimation method and the output signal of said wheel speed detecting means;
• estimating means for estimating a resonance frequency of said tire based on the calculated parameter;
• and
• pressure determining means for determining abnormality of said tire pressure or estimating said tire pressure based on the parameter which is estimated by estimating means.

A tire pressure estimating system comprising:

• wheel speed estimating means for detecting a rotational speed of a vehicle wheel including a component of vibration provided to a tire of said wheel and for generating a signal representative thereof;
• calculating means for calculating a parameter of a predetermined mathematical expression model representative of tire vibration of said tire using a discrete-time method and one of a linear and non-linear combination of plurality of rotational speed signal detected by said wheel speed detecting means;
• estimating means for estimating a resonance frequency of said tire based on the calculated parameter;
• and
• pressure determining means for determining abnormality of said tire pressure or estimating said tire pressure based on the parameter which is estimated by estimating means.