Method and system for determining a pressure deviation between a setpoint tire pressure and an actual tire pressure for a tire of a vehicle as well as for determining a wheel load
First Claim
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1. A method for indicating a vehicle tire pressure, the vehicle including a control device, a force sensor, wheel sensor, and a display, the method comprising:
- ascertaining, by the force sensor, a wheel load for the tire;
ascertaining, by the wheel sensor, a dynamic tire radius of the tire; and
determining, by the control device, a pressure deviation as a function of the wheel load and the dynamic tire radius;
wherein a non-loaded tire radius of the tire is specified in a non-loaded state, and the actual tire pressure is calculated, by the control device, as a function of the wheel load, the non-loaded tire radius, and the dynamic tire radius using a tire rigidity function;
wherein the tire rigidity function is specified, and the control device is configured to calculate a tire rigidity of the tire as a function of the wheel load, the actual tire pressure, and a velocity, at which the vehicle is currently traveling; and
wherein constants of the tire rigidity function are learned in that measured values for the velocity and the wheel load are ascertained for multiple points in time and in that for these measured values the constants are determined such that an estimation error is minimized; and
displaying, on the display, a setpoint tire pressure and the actual tire pressure.
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Abstract
A pressure deviation between a setpoint tire pressure and an actual tire pressure for a tire of a vehicle is determined by the following steps:
- Ascertaining a wheel load for the tire.
- Ascertaining a dynamic tire radius of the tire.
- Determining the pressure deviation as a function of the wheel load and the dynamic tire radius.
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Citations
9 Claims
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1. A method for indicating a vehicle tire pressure, the vehicle including a control device, a force sensor, wheel sensor, and a display, the method comprising:
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ascertaining, by the force sensor, a wheel load for the tire; ascertaining, by the wheel sensor, a dynamic tire radius of the tire; and determining, by the control device, a pressure deviation as a function of the wheel load and the dynamic tire radius; wherein a non-loaded tire radius of the tire is specified in a non-loaded state, and the actual tire pressure is calculated, by the control device, as a function of the wheel load, the non-loaded tire radius, and the dynamic tire radius using a tire rigidity function; wherein the tire rigidity function is specified, and the control device is configured to calculate a tire rigidity of the tire as a function of the wheel load, the actual tire pressure, and a velocity, at which the vehicle is currently traveling; and wherein constants of the tire rigidity function are learned in that measured values for the velocity and the wheel load are ascertained for multiple points in time and in that for these measured values the constants are determined such that an estimation error is minimized; and displaying, on the display, a setpoint tire pressure and the actual tire pressure. - View Dependent Claims (2, 3, 4, 5, 9)
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6. A system for indicating a vehicle tire pressure, comprising:
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a control device adapted to ascertain, by a wheel sensor, a dynamic tire radius of the tire, to ascertain, by a force sensor, a wheel load for the tire, and to determine the pressure deviation as a function of the wheel load and the dynamic tire radius; and a display; wherein a non-loaded tire radius of the tire is specified in a non-loaded state, and the control device is configured to calculate the actual tire pressure as a function of the wheel load, the non-loaded tire radius, and the dynamic tire radius using a tire rigidity function; wherein the tire rigidity function is specified, and the control device is configured to calculate a tire rigidity of the tire as a function of the wheel load, the actual tire pressure, and a velocity, at which the vehicle is currently traveling; and wherein the control device is configured to learn constants of the tire rigidity function in that measured values for the velocity and the wheel load are ascertained for multiple points in time and in that for these measured values the constants are determined such that an estimation error is minimized; and wherein the control device is adapted to display, on the display, a set point tire pressure and the actual tire pressure. - View Dependent Claims (8)
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7. A method for indicating a vehicle tire pressure, the vehicle including a control device, a pressure sensor, a wheel sensor, and a display, the method comprising:
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ascertaining, by the pressure sensor, an actual tire pressure; ascertaining, by the wheel sensor, a dynamic tire radius of the tire; specifying a non-loaded tire radius of the tire in a non-loaded state; and determining, by the control device, the wheel load for the tire as a function of the actual tire pressure, the dynamic tire radius, and the non-loaded tire radius using a tire rigidity function; wherein the tire rigidity function is specified, and the control device is configured to calculate a tire rigidity of the tire as a function of the wheel load, the actual tire pressure, and a velocity, at which the vehicle is currently traveling; and wherein constants of the tire rigidity function are learned in that measured values for the velocity and the wheel load are ascertained for multiple points in time and in that for these measured values the constants are determined such that an estimation error is minimized; and determining, by the control device, a tire rigidity (m) by the following equation as a function of the dynamic tire radius (rdyn), the non-loaded tire radius (r0), and the determined wheel load (f);
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Specification