{"id":11891,"date":"2023-07-14T10:53:36","date_gmt":"2023-07-14T10:53:36","guid":{"rendered":"https:\/\/dgzx.hk?p=11891"},"modified":"2023-07-14T10:53:36","modified_gmt":"2023-07-14T10:53:36","slug":"effect-of-temperature-on-vehicle-camera-module","status":"publish","type":"post","link":"https:\/\/dgzx.hk\/vi\/tac-dong-cua-nhiet-do-len-mo-dun-camera-xe\/","title":{"rendered":"\u1ea2nh h\u01b0\u1edfng c\u1ee7a nhi\u1ec7t \u0111\u1ed9 \u0111\u1ebfn m\u00f4-\u0111un camera xe"},"content":{"rendered":"

Chi\u1ebfc xe \u0111\u1ea7u ti\u00ean c\u1ee7a b\u1ea1n, gi\u1ed1ng nh\u01b0 xe c\u1ee7a t\u00f4i, c\u00f3 th\u1ec3 thi\u1ebfu c\u00e1c m\u00f4-\u0111un c\u1ea3m bi\u1ebfn nh\u01b0 camera, radar v\u00e0 lidar gi\u00fap h\u1ed7 tr\u1ee3 c\u00e1c t\u00ednh n\u0103ng an to\u00e0n c\u1ee7a h\u1ec7 th\u1ed1ng h\u1ed7 tr\u1ee3 ng\u01b0\u1eddi l\u00e1i ti\u00ean ti\u1ebfn (ADAS) hi\u1ec7n \u0111\u1ea1i, ch\u1eb3ng h\u1ea1n nh\u01b0 ph\u00e1t hi\u1ec7n \u0111i\u1ec3m m\u00f9, h\u1ed7 tr\u1ee3 \u0111\u1ed7 xe v\u00e0 tr\u00e1nh va ch\u1ea1m.<\/span> V\u00ec d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c thu th\u1eadp b\u1edfi c\u00e1c m\u00f4-\u0111un c\u1ea3m bi\u1ebfn n\u00e0y c\u00f3 li\u00ean quan tr\u1ef1c ti\u1ebfp \u0111\u1ebfn s\u1ef1 an to\u00e0n c\u1ee7a h\u00e0nh kh\u00e1ch n\u00ean \u0111i\u1ec1u quan tr\u1ecdng l\u00e0 ph\u1ea3i \u0111\u1ea3m b\u1ea3o ch\u00fang lu\u00f4n ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng.<\/span> Th\u1eadt kh\u00f4ng may, nguy\u00ean nh\u00e2n g\u00e2y h\u01b0 h\u1ecfng ph\u1ed5 bi\u1ebfn l\u00e0 do qu\u00e1 nhi\u1ec7t ho\u1eb7c ti\u1ebfp x\u00fac v\u1edbi \u0111\u1ed9 \u1ea9m trong th\u1eddi gian d\u00e0i.<\/span><\/p>\n

C\u00e1c c\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9 ch\u00ednh x\u00e1c trong camera, radar v\u00e0 liDAR gi\u00fap k\u00e9o d\u00e0i tu\u1ed5i th\u1ecd v\u00e0 t\u0103ng c\u01b0\u1eddng \u0111\u1ed9 an to\u00e0n c\u0169ng nh\u01b0 \u0111\u1ed9 tin c\u1eady.<\/span> \u0110\u1ea7u ti\u00ean, ch\u00fang ta h\u00e3y xem x\u00e9t t\u00e1c \u0111\u1ed9ng c\u1ee7a nhi\u1ec7t \u0111\u1ed9 l\u00ean m\u00f4-\u0111un camera tr\u00ean \u00f4 t\u00f4.<\/span><\/p>\n

H\u00ecnh 1 cho th\u1ea5y m\u1ed7i xe c\u00f3 th\u1ec3 c\u00f3 t\u1edbi s\u00e1u camera.<\/span> Nh\u1eefng m\u00e1y \u1ea3nh n\u00e0y y\u00eau c\u1ea7u d\u1ea3i \u0111\u1ed9ng cao v\u00e0 th\u1eddi gian ph\u1ea3n h\u1ed3i nhanh c\u0169ng nh\u01b0 \u0111\u1ed9 nh\u1ea1y s\u00e1ng tuy\u1ec7t v\u1eddi.<\/span> \u0110\u1ec3 \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u n\u00e0y, c\u00e1c nh\u00e0 thi\u1ebft k\u1ebf ph\u1ea3i tr\u00e1nh \u0111\u1ec3 c\u1ea3m bi\u1ebfn h\u00ecnh \u1ea3nh ho\u1ea1t \u0111\u1ed9ng \u1edf nhi\u1ec7t \u0111\u1ed9 cao trong th\u1eddi gian d\u00e0i.<\/span><\/p>\n

\"h\u00ecnh<\/span><\/p>\n

<\/span><\/p>\n

                                                                                H\u00ecnh 1: T\u1ed5ng quan v\u1ec1 c\u1ea3m bi\u1ebfn ADAS tr\u00ean xe hi\u1ec7n \u0111\u1ea1i<\/p>\n

Nh\u01b0 th\u1ec3 hi\u1ec7n trong H\u00ecnh 2, camera \u00f4 t\u00f4 th\u01b0\u1eddng l\u00e0 nh\u1eefng kh\u1ed1i l\u1eadp ph\u01b0\u01a1ng kh\u00e9p k\u00edn nh\u1ecf (1,4in\u00b3) kh\u00f4ng c\u00f3 h\u1ec7 th\u1ed1ng l\u00e0m m\u00e1t ch\u1ee7 \u0111\u1ed9ng, khi\u1ebfn ch\u00fang r\u1ea5t d\u1ec5 t\u00edch t\u1ee5 nhi\u1ec7t v\u00e0 n\u00f3ng l\u00ean nhanh ch\u00f3ng.<\/span> C\u1ea3m bi\u1ebfn h\u00ecnh \u1ea3nh th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 \u1edf nhi\u1ec7t \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng t\u1eeb -40 \u00b0C \u0111\u1ebfn 125\u00b0C (nhi\u1ec7t \u0111\u1ed9 \u0111i\u1ec3m n\u1ed1i) v\u00e0 -40 \u00b0C \u0111\u1ebfn 105\u00b0C (nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng).<\/span> N\u1ebfu \u0111\u1ea1t \u0111\u1ebfn gi\u1edbi h\u1ea1n tr\u00ean ho\u1eb7c d\u01b0\u1edbi c\u1ee7a c\u00e1c ph\u1ea1m vi n\u00e0y, b\u1ed9 \u0111i\u1ec1u khi\u1ec3n \u0111i\u1ec7n t\u1eed (ECU) s\u1ebd ph\u1ea3i gi\u1ea3m c\u00f4ng su\u1ea5t \u0111i v\u00e0o c\u1ea3m bi\u1ebfn h\u00ecnh \u1ea3nh ho\u1eb7c t\u1eaft ho\u00e0n to\u00e0n c\u1ea3m bi\u1ebfn cho \u0111\u1ebfn khi nhi\u1ec7t \u0111\u1ed9 tr\u1edf l\u1ea1i \u0111i\u1ec1u ki\u1ec7n ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng.<\/span> Do \u0111\u00f3, vi\u1ec7c \u0111o ch\u00ednh x\u00e1c nhi\u1ec7t \u0111\u1ed9 c\u1ee7a m\u00e1y \u1ea3nh l\u00e0 r\u1ea5t quan tr\u1ecdng.<\/span><\/p>\n

                                                                \"h\u00ecnh                                                H\u00ecnh 2: M\u00f4-\u0111un camera cho xe \u00f4 t\u00f4 nh\u1ecf<\/span><\/span><\/p>\n

<\/span><\/span><\/p>\n

C\u1ea3m bi\u1ebfn h\u00ecnh \u1ea3nh th\u01b0\u1eddng s\u1eed d\u1ee5ng c\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9 t\u00edch h\u1ee3p v\u1edbi ph\u1ea1m vi sai s\u1ed1 l\u00e0 \u00b16\u00b0C.<\/span> L\u1ed7i l\u1edbn nh\u01b0 v\u1eady c\u00f3 ngh\u0129a l\u00e0 ECU c\u00f3 th\u1ec3 h\u1ea1n ch\u1ebf vi\u1ec7c s\u1eed d\u1ee5ng camera b\u1eb1ng c\u00e1ch t\u1eaft camera s\u1edbm h\u01a1n ho\u1eb7c mu\u1ed9n h\u01a1n.<\/span> Nh\u1eefng t\u00ednh to\u00e1n sai l\u1ea7m n\u00e0y c\u00f3 th\u1ec3 g\u00e2y h\u1ecfng c\u1ea3m bi\u1ebfn h\u00ecnh \u1ea3nh, t\u1ea1m th\u1eddi h\u1ea1n ch\u1ebf ch\u1ee9c n\u0103ng ADAS cho \u0111\u1ebfn khi n\u00f3 \u0111\u01b0\u1ee3c b\u1ea3o tr\u00ec.<\/span><\/p>\n

Gi\u1ea3i ph\u00e1p l\u00e0 th\u00eam m\u1ed9t c\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9 ri\u00eang bi\u1ec7t c\u00f3 kh\u1ea3 n\u0103ng \u0111o nhi\u1ec7t \u0111\u1ed9 ch\u00ednh x\u00e1c v\u1edbi sai s\u1ed1 nh\u1ecf h\u01a1n \u00b11\u00b0C.<\/span><\/p>\n

ra\u0111a<\/span><\/p>\n

\u0110\u1ed9 nh\u1ea1y c\u1ee7a b\u1ed9 thu (RX), \u0111\u1ed9 khu\u1ebfch \u0111\u1ea1i, ti\u1ebfng \u1ed3n \u0111\u1ea7u v\u00e0o v\u00e0 th\u1eadm ch\u00ed c\u00f4ng su\u1ea5t b\u1ed9 ph\u00e1t (TX) \u0111\u1ea7u ra c\u1ee7a c\u1ea3m bi\u1ebfn s\u00f3ng milimet (mmWave) c\u00f3 th\u1ec3 thay \u0111\u1ed5i theo nhi\u1ec7t \u0111\u1ed9.<\/span> Trong H\u00ecnh 3, b\u1ed9 x\u1eed l\u00fd ch\u1ee7 c\u1ed1 g\u1eafng gi\u1ea3m thi\u1ec3u t\u00e1c \u0111\u1ed9ng c\u1ee7a nh\u1eefng thay \u0111\u1ed5i nhi\u1ec7t \u0111\u1ed9 b\u1eb1ng c\u00e1ch \u0111i\u1ec1u ch\u1ec9nh \u0111\u1ecbnh k\u1ef3 c\u1ea5u h\u00ecnh m\u1ea1ch trong qu\u00e1 tr\u00ecnh v\u1eadn h\u00e0nh \u0111\u1ec3 gi\u1eef m\u1ee9c t\u0103ng RX v\u00e0 c\u00f4ng su\u1ea5t TX c\u00e0ng g\u1ea7n v\u1edbi C\u00e0i \u0111\u1eb7t \u0111\u00e3 c\u1ea5u h\u00ecnh c\u00e0ng t\u1ed1t.<\/span><\/p>\n

\"h\u00ecnh<\/span><\/span><\/p>\n<\/p>\n

Nhu c\u1ea7u \u0111o nhi\u1ec7t \u0111\u1ed9 c\u00f3 \u0111\u1ed9 ch\u00ednh x\u00e1c cao l\u00e0 do c\u1ea7n ph\u1ea3i c\u00e2n b\u1eb1ng gi\u1eefa vi\u1ec7c t\u1ed1i \u0111a h\u00f3a hi\u1ec7u su\u1ea5t radar v\u00e0 ng\u0103n ng\u1eeba thi\u1ec7t h\u1ea1i do nhi\u1ec7t do nhi\u1ec7t \u0111\u1ed9 cao.<\/span> \u0110\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c s\u1ef1 c\u00e2n b\u1eb1ng n\u00e0y, c\u1ea3m bi\u1ebfn radar ph\u1ea3i ho\u1ea1t \u0111\u1ed9ng g\u1ea7n gi\u1edbi h\u1ea1n nhi\u1ec7t \u0111\u1ed9 trong khi v\u1eabn c\u00f3 th\u1ec3 t\u1eaft m\u1ed9t c\u00e1ch \u0111\u00e1ng tin c\u1eady khi g\u1ea7n gi\u1edbi h\u1ea1n nh\u1ea5t c\u00f3 th\u1ec3.<\/span> Vi\u1ec7c \u0111\u1ea1t \u0111\u01b0\u1ee3c \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 kh\u00f3 kh\u0103n v\u00ec:<\/span><\/p>\n

C\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t b\u1eaft \u0111\u1ea7u y\u00eau c\u1ea7u nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng cao h\u01a1n.<\/span><\/p>\n

\u0110\u1ec3 gi\u1ea3m chi ph\u00ed, c\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t \u0111ang b\u1eaft \u0111\u1ea7u s\u1eed d\u1ee5ng v\u1ecf m\u00f4-\u0111un b\u1eb1ng nh\u1ef1a thay v\u00ec v\u1ecf kim lo\u1ea1i.<\/span> Kim lo\u1ea1i d\u1eabn nhi\u1ec7t t\u1ed1t h\u01a1n v\u00e0 th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0m b\u1ed9 t\u1ea3n nhi\u1ec7t \u0111\u1ec3 t\u1ea3n nhi\u1ec7t sinh ra b\u00ean trong m\u00f4-\u0111un.<\/span><\/p>\n

Chip radar c\u00f3 m\u1ee9c ti\u00eau th\u1ee5 \u0111i\u1ec7n n\u0103ng cao v\u00e0 s\u1ebd g\u00e2y ra hi\u1ec7n t\u01b0\u1ee3ng n\u00f3ng \u0111\u1ed9t ng\u1ed9t.<\/span><\/p>\n

C\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9 nh\u00fang tr\u00ean chip radar c\u00f3 ph\u1ea1m vi sai s\u1ed1 l\u00ean t\u1edbi \u00b17\u00b0C, \u0111i\u1ec1u n\u00e0y h\u1ea1n ch\u1ebf hi\u1ec7u su\u1ea5t c\u1ee7a chip radar.<\/span> Do l\u1ed7i n\u00e0y, b\u1ea1n c\u00f3 th\u1ec3 t\u1eaft m\u00e1y \u1edf m\u1ee9c \u00b17\u00b0C so v\u1edbi gi\u1edbi h\u1ea1n ho\u1ea1t \u0111\u1ed9ng \u0111\u1ec3 tr\u00e1nh h\u01b0 h\u1ecfng.<\/span><\/p>\n

Ng\u00e0y nay, c\u00e1c nh\u00e0 thi\u1ebft k\u1ebf h\u01b0\u1edbng t\u1edbi m\u1ee5c ti\u00eau \u0111\u1ea1t \u0111\u01b0\u1ee3c \u0111\u1ed9 ch\u00ednh x\u00e1c v\u1ec1 nhi\u1ec7t \u0111\u1ed9 l\u00e0 \u00b11\u00b0C \u0111\u1ed1i v\u1edbi nhi\u1ec7t \u0111\u1ed9 c\u1ee7a chip tr\u1ea7n b\u00ean trong chip radar.<\/span> \u0110\u1ec3 th\u1ef1c hi\u1ec7n vi\u1ec7c n\u00e0y, b\u1ea1n c\u00f3 th\u1ec3 \u0111o s\u1ef1 ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9 b\u1eb1ng hai c\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9 ri\u00eang bi\u1ec7t ho\u1eb7c s\u1eed d\u1ee5ng c\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9 si\u00eau m\u1ecfng d\u01b0\u1edbi chip radar, ch\u1eb3ng h\u1ea1n nh\u01b0 TMP114.<\/span><\/p>\n

radar laser<\/span><\/strong><\/p>\n

Nh\u01b0 th\u1ec3 hi\u1ec7n trong H\u00ecnh 4, c\u00e1c c\u1ea3m bi\u1ebfn LiDAR c\u00f3 th\u1ec3 thu th\u1eadp d\u1eef li\u1ec7u t\u1ea7m ng\u1eafn, trung b\u00ecnh v\u00e0 d\u00e0i, cung c\u1ea5p c\u00e1c \u0111\u00e1m m\u00e2y \u0111i\u1ec3m s\u00e2u nh\u01b0 m\u1ed9t y\u1ebfu t\u1ed1 quan tr\u1ecdng gi\u00fap t\u0103ng c\u01b0\u1eddng b\u1ea3o m\u1eadt ch\u1ee9c n\u0103ng cho ADAS.<\/span> Lidar bao g\u1ed3m c\u00e1c m\u1ea3ng laser, c\u1ea3m bi\u1ebfn th\u1eddi gian bay (ToF) v\u00e0 b\u1ed9 \u0111i\u1ec1u khi\u1ec3n, t\u1ea5t c\u1ea3 \u0111\u1ec1u c\u1ea7n b\u00f9 nhi\u1ec7t \u0111\u1ed9 \u0111\u1ec3 duy tr\u00ec hi\u1ec7u su\u1ea5t.<\/span> Thay \u0111\u1ed5i nhi\u1ec7t \u0111\u1ed9 c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn ph\u00e9p \u0111o ph\u1ea1m vi LiDAR v\u00e0 hi\u1ec7u su\u1ea5t c\u1ee7a m\u1ea3ng laser c\u00f3 th\u1ec3 gi\u1ea3m s\u00fat \u1edf nhi\u1ec7t \u0111\u1ed9 tr\u00ean 70\u00b0C.<\/span> C\u1ea3m bi\u1ebfn ToF c\u00f3 m\u1ee9c ti\u00eau th\u1ee5 \u0111i\u1ec7n n\u0103ng cao, g\u00e2y ra hi\u1ec7n t\u01b0\u1ee3ng t\u1ecfa nhi\u1ec7t t\u1ef1 ph\u00e1t v\u00e0 \u1edf nhi\u1ec7t \u0111\u1ed9 kho\u1ea3ng 105\u00b0C, b\u1ed9 \u0111i\u1ec1u khi\u1ec3n th\u01b0\u1eddng c\u1ea7n gi\u1ea3m t\u1ea7n s\u1ed1 xung nh\u1ecbp ho\u1eb7c t\u1eaft ho\u00e0n to\u00e0n \u0111\u1ec3 tr\u00e1nh hi\u1ec7n t\u01b0\u1ee3ng m\u1ea5t ki\u1ec3m so\u00e1t nhi\u1ec7t.<\/span><\/p>\n

\"h\u00ecnh<\/span><\/span><\/p>\n<\/p>\n

                                                                                                            Ph\u1ea1m vi lidar \u00f4 t\u00f4<\/p>\n

M\u1ed9t c\u00e2n nh\u1eafc quan tr\u1ecdng khi thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng liDAR l\u00e0 M\u1ee9c \u0111\u1ed9 to\u00e0n v\u1eb9n an to\u00e0n (ASIL) c\u1ee7a xe m\u1ee5c ti\u00eau.<\/span><\/p>\n

C\u1ea3 m\u00f4-\u0111un LiDAR v\u00e0 camera \u0111\u1ec1u c\u00f3 \u1ed1ng k\u00ednh c\u00f3 th\u1ec3 v\u1ee1, do \u0111\u00f3 h\u1ec7 th\u1ed1ng quang h\u1ecdc b\u00ean trong c\u00f3 th\u1ec3 b\u1ecb h\u1ecfng do \u0111\u1ed9 \u1ea9m.<\/span> C\u1ea3m bi\u1ebfn \u0111\u1ed9 \u1ea9m d\u00e0nh cho \u00f4 t\u00f4, ch\u1eb3ng h\u1ea1n nh\u01b0 HDC3020-Q1, \u0111o \u0111\u1ed9 \u1ea9m t\u01b0\u01a1ng \u0111\u1ed1i v\u00e0 nhi\u1ec7t \u0111\u1ed9.<\/span> H\u1ec7 th\u1ed1ng n\u00e0y ph\u00e1t hi\u1ec7n \u0111\u1ed9 \u1ea9m (c\u00f3 th\u1ec3 ch\u1ec9 ra r\u00f2 r\u1ec9) v\u00e0 t\u00ednh to\u00e1n th\u1eddi \u0111i\u1ec3m \u0111i\u1ec3m s\u01b0\u01a1ng v\u01b0\u1ee3t qu\u00e1 (c\u00f3 th\u1ec3 g\u00e2y ng\u01b0ng t\u1ee5 tr\u00ean \u1ed1ng k\u00ednh), cho ph\u00e9p h\u1ec7 th\u1ed1ng th\u00f4ng b\u00e1o cho ng\u01b0\u1eddi d\u00f9ng \u0111\u1ec3 th\u1ef1c hi\u1ec7n h\u00e0nh \u0111\u1ed9ng kh\u1eafc ph\u1ee5c.<\/span><\/p>\n

C\u00e1ch ch\u1ecdn c\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9<\/span><\/strong><\/p>\n

Khi \u0111\u00e1nh gi\u00e1 c\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9 ti\u1ebfp theo c\u1ee7a b\u1ea1n, h\u00e3y c\u00e2n nh\u1eafc \u0111\u1ebfn \u0111\u1ed9 ch\u00ednh x\u00e1c t\u1ed1i \u0111a c\u1ee7a n\u00f3, li\u1ec7u n\u00f3 c\u00f3 c\u1ea7n b\u00e1o \u0111\u1ed9ng hay c\u00e1c t\u00ednh n\u0103ng kh\u00e1c kh\u00f4ng v\u00e0 k\u00eanh li\u00ean l\u1ea1c c\u1ee7a b\u1ea1n.<\/span> V\u00ed d\u1ee5, n\u1ebfu b\u1ea1n kh\u00f4ng c\u00f3 b\u1ea5t k\u1ef3 k\u00eanh ADC n\u00e0o kh\u1ea3 d\u1ee5ng (th\u01b0\u1eddng c\u00f3 trong c\u00e1c camera gi\u00e1m s\u00e1t chu vi v\u00e0 c\u1ea5p th\u1ea5p), th\u00ec b\u1ea1n c\u00f3 th\u1ec3 k\u1ebft n\u1ed1i c\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9 k\u1ef9 thu\u1eadt s\u1ed1 v\u1edbi k\u00eanh I2C ho\u1eb7c SPI c\u1ee7a b\u1ed9 tu\u1ea7n t\u1ef1 h\u00f3a FPD-Link.<\/span> N\u1ebfu b\u1ea1n ch\u1ec9 mu\u1ed1n c\u1ea3nh b\u00e1o ng\u01b0\u1ee1ng v\u1edbi \u0111\u1ed9 tr\u1ec5, b\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00f4ng t\u1eafc nhi\u1ec7t \u0111\u1ed9 \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi \u0111\u1ea7u v\u00e0o\/\u0111\u1ea7u ra chung.<\/span> Khi b\u1ea1n c\u00f3 k\u00eanh ADC, \u0111i\u1ec7n \u00e1p \u0111\u1ea7u ra c\u1ee7a c\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9 t\u01b0\u01a1ng t\u1ef1 s\u1ebd t\u1ef7 l\u1ec7 thu\u1eadn v\u1edbi nhi\u1ec7t \u0111\u1ed9 v\u00e0 kh\u00f4ng b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi dung sai c\u1ee7a linh ki\u1ec7n b\u00ean ngo\u00e0i nh\u01b0 tr\u01b0\u1eddng h\u1ee3p c\u1ee7a c\u00e1c gi\u1ea3i ph\u00e1p nhi\u1ec7t \u0111i\u1ec7n tr\u1edf r\u1eddi r\u1ea1c.<\/span> N\u1ebfu b\u1ea1n th\u1ef1c s\u1ef1 c\u1ea7n m\u1ed9t nhi\u1ec7t \u0111i\u1ec7n tr\u1edf, h\u00e3y c\u00e2n nh\u1eafc \u0111\u1ebfn nhi\u1ec7t \u0111i\u1ec7n tr\u1edf tuy\u1ebfn t\u00ednh g\u1ed1c silicon, c\u00f3 th\u1ec3 gi\u1ea3i quy\u1ebft c\u00e1c v\u1ea5n \u0111\u1ec1 v\u1ec1 \u0111\u1ed9 ch\u00ednh x\u00e1c v\u00e0 \u0111\u1ed9 tin c\u1eady t\u1ed3n t\u1ea1i \u1edf nhi\u1ec7t \u0111i\u1ec7n tr\u1edf h\u1ec7 s\u1ed1 nhi\u1ec7t \u0111\u1ed9 \u00e2m (NTC), \u0111\u1ed3ng th\u1eddi v\u1eabn duy tr\u00ec \u0111\u01b0\u1ee3c \u01b0u \u0111i\u1ec3m l\u00e0 chi ph\u00ed th\u1ea5p v\u00e0 k\u00edch th\u01b0\u1edbc nh\u1ecf.<\/span><\/p>\n

l\u1eddi k\u1ebft th\u00fac<\/span><\/strong><\/p>\n

H\u1ec7 th\u1ed1ng quang h\u1ecdc c\u00f3 \u0111\u1ed9 nh\u1ea1y cao \u0111\u00f2i h\u1ecfi ph\u1ea3i ch\u1ea9n \u0111o\u00e1n ch\u00ednh x\u00e1c \u0111\u1ec3 duy tr\u00ec hi\u1ec7u su\u1ea5t v\u01b0\u1ee3t tr\u1ed9i theo th\u1eddi gian, gi\u1ed1ng nh\u01b0 m\u00f4-\u0111un ADAS RF.<\/span> \u0110i\u1ec1u n\u00e0y \u0111\u00f2i h\u1ecfi ph\u1ea3i s\u1eed d\u1ee5ng c\u00e1c c\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9 b\u00ean ngo\u00e0i ch\u00ednh x\u00e1c, m\u1ed9t th\u00e0nh ph\u1ea7n c\u1ea7n thi\u1ebft c\u1ee7a m\u00f4-\u0111un ADAS \u0111ang nhanh ch\u00f3ng tr\u1edf th\u00e0nh h\u1ec7 th\u1ed1ng quan tr\u1ecdng v\u1ec1 an to\u00e0n trong t\u01b0\u01a1ng lai.<\/span><\/p>","protected":false},"excerpt":{"rendered":"

Your first car, like mine, may lack sensor modules such as cameras, radar, and lidar that make the safety features of modern Advanced Driver assistance systems (ADAS) possible, such as blind spot detection, parking assistance, and collision avoidance. Since the data collected by these sensor modules is directly related to passenger safety, it is important to ensure that they are always working properly. Unfortunately, a common cause of damage is prolonged overheating or exposure to moisture. Precise temperature sensors in cameras, radars and liDAR help extend their life and enhance safety and reliability. First, let's look at the effect of temperature on the car camera module. Figure 1 shows that each car may have as many as six cameras. These cameras require high dynamic range and fast response times as well as excellent low light sensitivity. To meet these requirements, designers must avoid image sensors operating at high temperatures for long periods of time.                                                                                 Figure 1: Overview of ADAS sensors in modern vehicles As shown in Figure 2, car cameras are typically small (1.4in\u00b3) closed cubes with no active cooling, making it very easy to accumulate heat and warm up quickly. Image sensors are typically rated for operating temperatures from -40 \u00b0C to 125\u00b0C (junction temperature) and -40 \u00b0C to 105\u00b0C (ambient temperature). If the upper or lower limits of these ranges are reached, the electronic control unit (ECU) will have to reduce the power entering the image sensor or turn the sensor off completely until the temperature returns to normal operating conditions. Therefore, it is very important to accurately obtain the temperature of the camera.                                                                                                                 Figure 2: Camera module for small car The image sensor usually uses an embedded temperature sensor with an error range of \u00b16\u00b0C. Such a large error means that the ECU may limit the use of the camera by turning it off earlier or later. These miscalculations can cause damage to the image sensor, temporarily limiting ADAS functionality until it can be maintained. The solution is to add a separate temperature sensor that provides an accurate temperature measurement with an error of less than \u00b11\u00b0C. radar The receiver (RX) sensitivity, gain, input noise, and even output transmitter (TX) power of a millimeter wave (mmWave) sensor can vary with temperature. In Figure 3, the host processor attempts to mitigate the effects of temperature changes by periodically adjusting the circuit configuration during operation to keep the RX gain and TX power as close as possible to the configured Settings. The need for high precision temperature measurement is due to the need to strike a balance between maximizing radar performance and preventing thermal damage due to high temperatures. In order to achieve this balance, the radar sensor must operate near the temperature limits while being able to reliably turn off as close to the limits as possible. Achieving this can be difficult because: Oems began to demand higher ambient temperatures. To reduce costs, manufacturers are starting to use plastic module housings instead of metal housings. Metal is a better heat conductor and is often used as a heat sink to dissipate the heat generated inside the module. The radar chip has high power consumption and will cause spontaneous heat. The embedded temperature sensor on the radar chip has an error range of up to \u00b17\u00b0C, which limits the performance of the radar chip. Because of this error, it is safe to turn it off at \u00b17\u00b0C from the operating limit to prevent damage. Today, designers aim to achieve a temperature accuracy of \u00b11\u00b0C for the temperature of the bare chip inside the radar chip. To do this, you can measure the temperature difference using two separate temperature sensors, or use an ultra-thin temperature sensor under the radar chip, such as the TMP114. Laser radar As shown in Figure 4, LiDAR sensors can capture short -, medium – and long-range data, providing deep point clouds as a key element in enabling functional security for ADAS. Lidar contains laser arrays, time-of-flight (ToF) sensors, and controllers, all of which require temperature compensation to maintain its performance. Temperature changes can affect liDAR range measurements, and the performance of the laser array may deteriorate above 70\u00b0C. ToF sensors have high power consumption, which causes spontaneous heat, and at around 105\u00b0C the controller often needs to reduce its clock frequency or turn it off completely to prevent thermal runaway.                                                                                                             Automotive lidar range An important design consideration for liDAR systems is the target vehicle Safety Integrity Level (ASIL). Both the liDAR and camera modules have lenses that can break, so the internal optics can be damaged by moisture. Automotive grade humidity sensors, such as the HDC3020-Q1, measure relative humidity and temperature. It detects moisture (which can indicate a leak) and calculates when the dew point is exceeded (which can cause condensation on the lens), allowing the system to notify the user to take corrective action. How to choose a temperature sensor When evaluating your next temperature sensor, consider its maximum accuracy, whether it needs alarms or other features, and your communication channels. For example, if you don't have any ADC channels available (typically found in<\/p>","protected":false},"author":5,"featured_media":11892,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","footnotes":""},"categories":[381],"tags":[399,376],"class_list":["post-11891","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledge","tag-vehicle-camera-module","tag-camera-module"],"_links":{"self":[{"href":"https:\/\/dgzx.hk\/vi\/wp-json\/wp\/v2\/posts\/11891","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dgzx.hk\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dgzx.hk\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dgzx.hk\/vi\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/dgzx.hk\/vi\/wp-json\/wp\/v2\/comments?post=11891"}],"version-history":[{"count":0,"href":"https:\/\/dgzx.hk\/vi\/wp-json\/wp\/v2\/posts\/11891\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dgzx.hk\/vi\/wp-json\/wp\/v2\/media\/11892"}],"wp:attachment":[{"href":"https:\/\/dgzx.hk\/vi\/wp-json\/wp\/v2\/media?parent=11891"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dgzx.hk\/vi\/wp-json\/wp\/v2\/categories?post=11891"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dgzx.hk\/vi\/wp-json\/wp\/v2\/tags?post=11891"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}