{"id":8638,"date":"2022-03-10T20:30:40","date_gmt":"2022-03-10T20:30:40","guid":{"rendered":"https:\/\/www.hexorcism.com\/19BP\/sm2334034\/"},"modified":"2022-03-10T20:30:40","modified_gmt":"2022-03-10T20:30:40","slug":"sm2334034","status":"publish","type":"page","link":"https:\/\/www.hexorcism.com\/19BP\/sm2334034\/","title":{"rendered":"HILL LAUNCH ASSIST (HLA)"},"content":{"rendered":"
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HILL LAUNCH ASSIST (HLA)<\/h3>\n<\/div>\n

SM2334034<\/p>\n

<\/p>\n
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id041500104700<\/p>\n



\n<\/a><\/p>\n

Purpose\/Function<\/p>\n

\u2022 The hill launch assist (HLA) is a function which assists the driver in accelerating the vehicle on a slope by activating the traction control solenoid valve in the DSC HU\/CM when the vehicle begins accelerating on a slope, and maintaining\/reducing brake fluid pressure to prevent the vehicle from rolling for a specified time.<\/div>\n
\u2022 The system automatically operates when the vehicle is stopped on a slope of approx. 3 % or more<\/span> (changes slightly depending on load and vehicle conditions such as tire wear and air pressure). (MTX)<\/div>\n
\u2022 The system automatically operates when the vehicle is stopped on a slope of approx. 6 % or more<\/span> (changes slightly depending on load and vehicle conditions such as tire wear and air pressure). (ATX)<\/p>\n
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Note<\/div>\n<\/dd>\n
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\u2022 The shift lever position is in the other than R position, the hill launch assist (HLA) operates on a upslope. (MTX)<\/div>\n
\u2022 The selector lever position is in the D\/M position, the hill launch assist (HLA) operates on a upslope. (ATX)<\/p>\n\n\n\n
<\/td>\n\n\n\n\n
<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
am3zzn00006791<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
\u2022 The selector\/shift lever position is in the R position, the hill launch assist (HLA) operates on a downslope.<\/p>\n\n\n\n
<\/td>\n\n\n\n\n
<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
am3zzn00006792<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
\u2022 The hill launch assist (HLA) operates constantly without affecting the DSC OFF switch operation.<\/div>\n
\u2022 When the parking brake is applied, the hill launch assist (HLA) does not operate.<\/div>\n
\u2022 When the DSC HU\/CM has malfunction, the hill launch assist (HLA) does not operate.<\/div>\n<\/div>\n<\/dd>\n<\/dl>\n<\/div>\n



\n<\/a><\/p>\n

Structure<\/p>\n

\u2022 The hill launch assist (HLA) constantly controls the brake fluid pressure in accelerating the vehicle on a slope by determining the hill launch assist (HLA) operation based on the signals input from each module via CAN communication, wheel speed signals from the ABS wheel-speed sensor.<\/div>\n

Block diagram<\/p>\n\n\n\n
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<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
am3zzn00008841<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Hydraulic circuit diagram<\/p>\n\n\n\n
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<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
ac5wzn00000248<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n



\n<\/a><\/p>\n

Operation<\/p>\n

\u2022 If all of the following conditions are met while the vehicle is stopped on a slope, the DSC HU\/CM performs controls to maintain brake fluid pressure (control the traction control solenoid valve) even if the driver has released the brake pedal.<\/div>\n


<\/p>\n

<\/a><\/p>\n

Hold control<\/p>\n

\n
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\u2022 Control conditions (all of the following conditions met):<\/div>\n
\n
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\u2015 Slope of approx. 3 % or more<\/span> (MTX)<\/div>\n
\u2015 Slope of approx. 6 % or more<\/span> (ATX)<\/div>\n
\u2015 Wheel speed is 0 km\/h {0 mph}<\/span><\/div>\n
\u2015 Parking brake not operated<\/div>\n
\u2015 Accelerator pedal not depressed<\/div>\n
\u2015 Not fail-safe mode is present<\/div>\n
\u2015 Upslope: The selector lever position is in the D\/M position (ATX)<\/div>\n
\u2015 Upslope: The shift lever position is in the position other than R (MTX)<\/div>\n
\u2015 Downslope: The selector\/shift lever position is in the R position<\/div>\n
\u2015 Brake pedal is depressed and brake fluid pressure is at a certain value or more<\/div>\n
\u2015 Clutch pedal depressed (MTX)<\/div>\n<\/dd>\n<\/dl>\n<\/dd>\n<\/dl>\n
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\u2022 Control description<\/p>\n
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Note<\/div>\n<\/dd>\n
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\u2022 Brake fluid pressure is maximum hold pressure or more<\/div>\n
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\u2015 If the brake fluid pressure decompresses to the maximum hold pressure when the driver releases the brake pedal without performing hold control, the brake pedal pressure is maintained at the maximum hold pressure position.<\/div>\n<\/dd>\n<\/dl>\n
\u2022 Brake fluid pressure fluctuates when it is bellow the maximum hold pressure<\/div>\n
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\u2015 The highest brake fluid pressure is maintained as the maximum hold pressure while fluctuating.<\/div>\n<\/dd>\n<\/dl>\n<\/div>\n<\/dd>\n<\/dl>\n<\/div>\n
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\u2015 If all of the control conditions are met, the DSC HU\/CM controls the traction control solenoid valve and maintains brake fluid pressure (driver can depress brake pedal more at this time).<\/p>\n\n\n\n
\n\n\n\n
<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
ac5uun00002845<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
\u2015 When releasing the brake pedal, the brake fluid pressure (stored hold pressure) is maintained for maximum of approx. 2 s<\/span>.<\/div>\n<\/dd>\n<\/dl>\n<\/dd>\n<\/dl>\n


<\/p>\n

<\/a><\/p>\n

Release control<\/p>\n

\n
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\u2022 Control condition<\/div>\n
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\u2015 After the accelerator pedal is depressed, the required engine torque for accelerating vehicle on a slope is produced<\/div>\n<\/dd>\n<\/dl>\n<\/dd>\n<\/dl>\n
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\u2022 Control description<\/div>\n
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\u2015 Brake fluid pressure being maintained is lowered depending on produced engine torque.<\/p>\n\n\n\n
<\/td>\n\n\n\n\n
<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
am3zzn00008638<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/dd>\n<\/dl>\n<\/dd>\n<\/dl>\n


<\/p>\n

<\/a><\/p>\n

Slow release control<\/p>\n

\n
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\u2022 Control condition (one or more of following conditions are met):<\/div>\n
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\u2015 Parking brake applied<\/div>\n
\u2015 Clutch pedal released (MTX)<\/div>\n
\u2015 Shift lever is in neutral position (MTX)<\/div>\n
\u2015 Selector lever is in P or N position (ATX)<\/div>\n
\u2015 DSC HU\/CM has malfunction (performs slow release control only if solenoid valve control is available)<\/div>\n
\u2015 0.2 s<\/span> has elapsed on slope of 1.0 % or less<\/span><\/div>\n
\u2015 Approx. 1.5 s<\/span> (MTX) or approx. 2 s<\/span> (ATX) has elapsed after the driver releases the brake pedal during hold control<\/div>\n<\/dd>\n<\/dl>\n
\u2022 Control description<\/div>\n
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\u2015 Maintained brake fluid pressure is decreased gradually<\/p>\n\n\n\n
<\/td>\n\n\n\n\n
<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
am3zzn00008639<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/dd>\n<\/dl>\n<\/dd>\n<\/dl>\n


<\/p>\n

<\/a><\/p>\n

Fast release control<\/p>\n

\n
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\u2022 Control condition<\/div>\n
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\u2015 DSC HU\/CM has malfunction and solenoid valve control is not available<\/div>\n<\/dd>\n<\/dl>\n
\u2022 Control description<\/div>\n
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\u2015 Brake fluid pressure being maintained is reduced to 0 kPa {0 mmHg, 0 inHg}<\/span> immediately<\/div>\n<\/dd>\n<\/dl>\n<\/dd>\n<\/dl>\n<\/div>\n
<\/div>\n
<\/div>\n
<\/div>\n

<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

HILL LAUNCH ASSIST (HLA) SM2334034 id041500104700 Purpose\/Function \u2022 The hill launch assist (HLA) is a function which assists the driver in accelerating the vehicle on a slope by activating the traction control solenoid valve in the DSC HU\/CM when the vehicle begins accelerating on a slope, and maintaining\/reducing brake fluid pressure to prevent the vehicle from rolling for a specified time. \u2022 The system automatically operates when the vehicle is stopped on a slope of […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-8638","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.hexorcism.com\/19BP\/wp-json\/wp\/v2\/pages\/8638","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hexorcism.com\/19BP\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.hexorcism.com\/19BP\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.hexorcism.com\/19BP\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hexorcism.com\/19BP\/wp-json\/wp\/v2\/comments?post=8638"}],"version-history":[{"count":0,"href":"https:\/\/www.hexorcism.com\/19BP\/wp-json\/wp\/v2\/pages\/8638\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.hexorcism.com\/19BP\/wp-json\/wp\/v2\/media?parent=8638"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}