Honda Motor Co., Ltd.

Honda Giken Kogyo Kabushiki Kaisha

Omron Corporation

Masaru Ishizaki

Kazuhiko Sato

Hirohito Miyazaki

Masatomo Matsumoto

Izumi Yamada

Akihiro Kakamu

Isamu Yoshioka

A light distribution-controlling device of a vehicle headlight includes headlight lamp bodies, light distribution operation switches, a front detection unit, a manual mode control unit that controls the light distribution of the headlight lamp body based on a signal outputting from the light distribution operation switch, an auto mode control unit that controls the light distribution of the headlight lamp body based on a signal output from the front detection unit, an auto mode changeover switch that switches control of the light distribution of the headlight lamp body to control by the auto mode control unit, a passing continuation-determining unit that determines whether a continuation time of an ON operation of a passing switch is more than or equal to a threshold continuation time, and an auto mode-returning unit that returns the control of the light distribution to the control by the auto mode control unit.

Light distribution-controlling device of vehicle headlight

In a headlamp luminance controlling device, a CPUfirst decides a luminance factor D based on a state of each switchto switchand a signal from a sensor. The CPUdetermines an initial value of a PWM duty ratio S from the luminance factor D with a load current Ap as a default value (rated current A). The CPUstarts the initial driving of a headlamp HL using the duty ratio S. The CPUthen determines the luminance factor D based on the state of each switchto switchand the signal from the sensor. Next, the CPUdetermines the PWM duty ratio S based on the luminance factor D and the load current Ap detected by the headlamp current detector. The CPUdrives the headlamp HL using the PWM duty ratio S.

Lighting control device and control method

In an illumination control apparatus which drives headlamps in a PWM mode and automatically lights them at low power in a vehicle when the DRL executing condition is held, failure in a PWM-drive switching device and break failure in the lamp are detected as well as the arrangement of control units is optimized and meeting models is facilitated. A relay which switches between lamps and a power source, a CPU which is connected to a CAN and drive-controls the relay for manual lighting, and an integrator circuit which integrates voltage of drive side terminals of the lamps are disposed in a main control unit. An FET which switches between the lamps and the power source, a CPU which drive-controls the FET for automatic lighting, and a power source connecting resister having a resistance value greater enough than that of the lamp that drive side terminals of the lamps are connected to the power source through an ignition switch contact of the vehicle are disposed in a DRL control unit. The CPU determines failure based on the output voltage of the integrator circuit.

Illumination control apparatus and failure detecting apparatus

Conforming with the differing conditions in which the left and right headlight lamps are placed, an anti-fogging structure for headlight lamps is proposed wherein variation in the anti-fogging performance on the left and right does not occur by providing differing structures for the breathing mechanisms in the left and right headlight lamps. In an anti-fogging mechanism for headlight lampsL andR provided on the left and right of the radiator fan at the front of the body of a vehicle, different structures are provided for the breathing holes that enable circulation of air into and out of the lamp housingsL andR of the left and right headlight lampsL andR.

Anti-fogging structure for headlight lamps

A light emitting circuit includes: a first circuit Hin which is provided a main light sourceand a second circuit Hconnected in parallel with the first circuit Hand in which is provided an auxiliary light sourceandwherein a drain (D) and a source (S) of an field effect transistorare connected in the second circuit Hand a gate (G) of the field effect transistoris connected to the first circuit H

Growing community of inventors

Wako, Japan

Masaru Ishizaki