Valve timing adjusting device
AssigneeDenso Corporation
InventorsKenji TADA, Hiroki TAKAHASHI
Life of this patent
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Abstract
A valve timing adjusting device adjusts an opening/closing timing of a first valve driven by a rotation of a first camshaft and an opening/closing timing of a second valve driven by a rotation of a second camshaft. The valve timing adjusting device includes a first driving circuit controlling a first motor configured to generate a torque to shift a rotation phase of the first camshaft and a second driving circuit controlling a second motor configured to generate a torque to shift a rotation phase of the second camshaft. A first switching element of the first driving circuit operates at a switching frequency that is different from that of a second switching element of the second driving circuit.
Claims4
A valve timing adjusting device configured to adjust an opening/closing timing of a first valve and an opening/closing timing of a second valve in an internal combustion engine, the first valve and the second valve being driven by a rotation of a first camshaft and a rotation of a second camshaft, respectively, the valve timing adjusting device comprising:
- a first motor configured to generate a torque to shift a rotation phase of the first camshaft;
- a first driving circuit configured to control the first motor to adjust the rotation phase of the first camshaft, the first driving circuit including a first switching element used for controlling the first motor;
- a second motor configured to generate a torque to shift a rotation phase of the second camshaft;
- and
- a second driving circuit configured to control the second motor to adjust the rotation phase of the second camshaft, the second driving circuit including a second switching element used for controlling the second motor, wherein
- the first switching element operates at a switching frequency different from that of the second switching element.
Dependencies are inferred from the claim text.