Patent ID: 7825779
Filing Date: 2010-11-02
Classification: B60R,G07C

Abstract:
1. A vehicle remote entry locking or unlocking chirp sound reduction system comprising: a remote transmitter operable to transmit a signal; a receiver operable to receive the signal from the remote transmitter; a controller operably connected to the receiver and being operable in response to the signal from the remote transmitter; a horn operably connected to the controller and connected to a power supply of the vehicle via wiring, wherein the wiring has a resistance that varies based on temperature; and a temperature sensor for sensing a temperature, wherein the controller determines a temperature of the wiring based on the sensed temperature and estimates a voltage applied to the horn based on the determined temperature and a voltage of the power supply, and wherein the controller is configured to cause the horn to generate an audible signal having a predetermined pulse duration which depends on the estimated voltage applied to the horn prior to or during actuation of the remote transmitter.