CN109484406B - Safety monitoring method for hybrid electric vehicle cruising speed closed-loop control LEVEL2 - Google Patents
Safety monitoring method for hybrid electric vehicle cruising speed closed-loop control LEVEL2 Download PDFInfo
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- CN109484406B CN109484406B CN201811554835.6A CN201811554835A CN109484406B CN 109484406 B CN109484406 B CN 109484406B CN 201811554835 A CN201811554835 A CN 201811554835A CN 109484406 B CN109484406 B CN 109484406B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/14—Adaptive cruise control
- B60W30/143—Speed control
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Abstract
A hybrid electric vehicle cruise speed closed-loop control LEVEL2 safety monitoring method monitors whether a cruise control error flag bit exists in an original cruise speed control state of a vehicle; if the original cruising speed control state of the vehicle is not available, the original cruising speed control state of the vehicle is independently adopted as a monitoring state; if the current cruise speed control state exists, the cruise speed control state under the safe calculation of the original cruise speed control state of the vehicle and the Level2 function is combined to be used as a monitoring state; and any monitoring state acquires the parameter quantity of the current vehicle cruising speed control state and feeds back the parameter quantity to the initial input end of the original cruising speed control state of the vehicle so as to carry out closed-loop control on the cruising speed state and finally realize cruising speed control under the safety monitoring of the Level2 function.
Description
Technical Field
The invention relates to the technical field of hybrid vehicle engineering, in particular to cruise speed closed-loop control of an automobile under functional safety monitoring.
Background
With the continuous improvement of environmental protection consciousness and the continuous enhancement of national regulations, the development of new energy automobiles is greatly promoted. The hybrid electric vehicle integrates the advantages of a pure electric vehicle and a traditional fuel vehicle, and becomes an important development direction of a new energy vehicle. Cruise control has become an essential feature in modern vehicle design because it reduces unnecessary vehicle speed variations, thereby saving fuel while greatly reducing the driving burden. Meanwhile, with the continuous improvement of safety awareness, the monitoring of the functional safety of the automobile is also becoming an aspect that must be considered by automobile designers.
Disclosure of Invention
The purpose of the invention is: the cruise vehicle speed closed-loop control based on Level2 function safety monitoring is provided, so that the cruise vehicle speed control under function safety monitoring is finally realized.
In order to achieve the technical purpose, the invention provides a safety monitoring method for closed-loop control LEVEL2 of hybrid electric vehicle cruising speed, which comprises the following steps: providing the original cruising speed control state of the vehicle and the cruising speed control state under the safe calculation of the Level2 function, and further comprising the following steps: monitoring whether a cruise control error zone bit exists in the original cruise speed control state of the vehicle; if the cruise control error flag bit does not appear, independently adopting the original cruise speed control state of the vehicle as a monitoring state; if the cruise control error flag bit exists, combining the original cruise speed control state of the vehicle and the cruise speed control state under the safety calculation of the Level2 function as a monitoring state; and any monitoring state acquires the parameter quantity of the current vehicle cruising speed control state and feeds back the parameter quantity to the initial input end of the original cruising speed control state of the vehicle so as to carry out closed-loop control on the cruising speed state and finally realize cruising speed control under the safety monitoring of the Level2 function.
The invention considers the original cruise control state of the vehicle and the cruise speed control state under the safe calculation of the Level2 function. If the Level2 function safely calculates the error-free flag bit, the original cruising speed control state of the vehicle is adopted. And if the Level2 function safety calculation has an error flag bit, adopting the cruise vehicle speed control state under the Level function safety calculation. All cruise speed control states can acquire the current vehicle cruise speed control state quantity and feed back the current vehicle cruise speed control state quantity to the strategy initial input end to perform cruise speed state closed-loop control. And finally, the cruise vehicle speed control under the function safety monitoring is realized.
As a further improvement, the calculation of the original cruising speed control state of the vehicle includes: inputting parameter quantities of the current vehicle cruising speed control state at the initial input end, including: DTC torque intervention, ESP torque intervention, wheel side torque change, gearbox gear selection, brake pedal state and vehicle speed monitoring, and cruise state activation calculation; after the cruise state activation is carried out through cruise control activation and filtering calculation, the original cruise speed control state of the vehicle is obtained, and the method comprises the following steps: a result of a cruise control active state and a result of the cruise control error flag.
As a further improvement, the calculation of the cruise vehicle speed control state under the Level2 function safety calculation includes: wheel-side requested torque calculation and Level2 cruise error state calculation; when a torque control request error flag bit exists in the cruise error state calculation of the Level2, the cruise vehicle speed control state under the cruise 2 function safety calculation is an error; when the torque control request error flag bit is not available in the Level2 cruise error state calculation, the cruise vehicle speed control state under the Level2 function safety calculation is the wheel-side required torque calculated by the Level2 cruise control.
As a further improvement, in the Level2 cruise error state calculation, a cruise switch state and a cruise control input torque gradient are input, and after filtering calculation, if the input torque gradient is too large, the torque control request error flag is activated.
As a further improvement, in the wheel-side required torque calculation, after a cruise control input torque gradient is input, a torque gradient limit is performed to obtain the wheel-side required torque calculated by the Level2 cruise control.
As a further improvement, the original cruise vehicle speed control state of the vehicle, the cruise error state calculation of the Level2 and the wheel side demand torque calculation are compared to obtain the monitoring state of the Level2 function safety cruise control, and the cruise state feedback is performed to feed the parameter quantity of the current vehicle cruise vehicle speed control state back to the initial input end of the original cruise vehicle speed control state of the vehicle, so as to perform the cruise vehicle speed state closed-loop control, and finally realize the cruise vehicle speed control under the safety monitoring of the Level2 function.
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FIG. 1 is a control flow diagram of the present invention.
Reference numerals: cruise status activation calculation 1; filtering calculation 2; the original cruising speed control state 3 of the vehicle; monitoring state 4; level2 cruise error state calculation 5; calculating the wheel edge required torque 6; cruise status feedback 7.
Detailed Description
As shown in FIG. 1, the invention provides a safety monitoring method for closed-loop control LEVEL2 of hybrid electric vehicle cruising speed, which comprises the following steps: providing the original cruising speed control state of the vehicle and the cruising speed control state under the safe calculation of the Level2 function, and further comprising the following steps: monitoring whether a cruise control error zone bit exists in the original cruise speed control state of the vehicle; if the cruise control error flag bit does not appear, independently adopting the original cruise speed control state of the vehicle as a monitoring state; if the cruise control error flag bit exists, combining the original cruise speed control state of the vehicle and the cruise speed control state under the safety calculation of the Level2 function as a monitoring state; and any monitoring state acquires the parameter quantity of the current vehicle cruising speed control state and feeds back the parameter quantity to the initial input end of the original cruising speed control state of the vehicle so as to carry out closed-loop control on the cruising speed state and finally realize cruising speed control under the safety monitoring of the Level2 function.
The invention considers the original cruise control state of the vehicle and the cruise speed control state under the safe calculation of the Level2 function. If the Level2 function safely calculates the error-free flag bit, the original cruising speed control state of the vehicle is adopted. And if the Level2 functional safety calculation has an error flag bit, adopting the cruise vehicle speed control state under the Level2 functional safety calculation. All cruise speed control states can acquire the current vehicle cruise speed control state quantity and feed back the current vehicle cruise speed control state quantity to the strategy initial input end to perform cruise speed state closed-loop control. And finally, the cruise vehicle speed control under the function safety monitoring is realized.
As a further improvement, the calculation of the original cruising speed control state of the vehicle includes: inputting parameter quantities of the current vehicle cruising speed control state at the initial input end, including: DTC torque intervention, ESP torque intervention, wheel side torque change, gearbox gear selection, brake pedal state and vehicle speed monitoring, and cruise state activation calculation 1 is carried out; after the cruise state activation is carried out through cruise control activation and filtering calculation 2, obtaining an original cruise speed control state 3 of the vehicle, which comprises the following steps: a result of a cruise control active state and a result of the cruise control error flag.
As a further improvement, the calculation of the cruise vehicle speed control state under the Level2 function safety calculation includes: wheel-side requested torque calculation 6 and Level2 cruise error state calculation 5; when a torque control request error flag bit exists in the Level2 cruise error state calculation 5, the cruise vehicle speed control state under the Level2 function safety calculation is an error; when the Level2 cruise error state calculation 5 does not have the torque control request error flag bit, the cruise vehicle speed control state under the Level2 function safety calculation is the wheel-side required torque calculated by the Level2 cruise control.
As a further improvement, in the Level2 cruise error state calculation 5, a cruise switch state and a cruise control input torque gradient are input, and after filtering calculation, if the input torque gradient is too large, the torque control request error flag is activated.
As a further modification, in the wheel-side required torque calculation 6, after a cruise control input torque gradient is input, a torque gradient limit is imposed to obtain the wheel-side required torque calculated by the Level2 cruise control.
As a further improvement, the original cruise vehicle speed control state 3 of the vehicle, the Level2 cruise error state calculation 5 and the wheel side demand torque calculation 6 are compared to obtain the monitoring state 4 of Level2 function safety cruise control, and the cruise state feedback 7 is carried out to feed the parameter quantity of the current cruise vehicle speed control state of the vehicle back to the initial input end of the original cruise vehicle speed control state of the vehicle so as to carry out cruise vehicle speed state closed-loop control, and finally, the cruise vehicle speed control under the safety monitoring of the Level2 function is realized.
The invention calculates the error flag bit through a Level2 functional safety monitoring strategy. Which vehicle cruise control state is used is determined by the error flag. And meanwhile, the state parameters of the vehicle under cruise control are fed back to the strategy input end, so that the cruise state closed-loop control is realized.
It is to be understood that the scope of the present invention is not to be limited to the non-limiting embodiments, which are illustrated as examples only. The essential protection sought herein is further defined in the scope provided by the independent claims, as well as in the claims dependent thereon.
Claims (3)
1. A safety monitoring method for hybrid electric vehicle cruising speed closed-loop control LEVEL2 comprises the following steps: the method is characterized in that the method provides a cruise speed control state under the conditions of an original cruise speed control state of a vehicle and a Level2 function safety calculation, and is characterized in that:
it still includes: monitoring whether a cruise control error zone bit exists in the original cruise speed control state of the vehicle;
if the cruise control error flag bit does not appear, independently adopting the original cruise speed control state of the vehicle as a monitoring state; if the cruise control error flag bit exists, combining the original cruise speed control state of the vehicle and the cruise speed control state under the safety calculation of the Level2 function as a monitoring state;
acquiring parameter quantity of a current vehicle cruising speed control state in any monitoring state and feeding back the parameter quantity to an initial input end of the original cruising speed control state of the vehicle to perform cruising speed state closed-loop control, and finally realizing cruising speed control under the safety monitoring of the Level2 function;
the calculation of the cruise vehicle speed control state under the Level2 function safety calculation comprises the following steps: wheel-side requested torque calculation (6) and Level2 cruise error state calculation (5);
when a torque control request error flag bit exists in the Level2 cruise error state calculation (5), the cruise vehicle speed control state under the Level2 function safety calculation is an error;
when the cruise error state calculation (5) of the Level2 does not have the torque control request error flag bit, the cruise vehicle speed control state under the Level2 function safety calculation is the wheel-side required torque calculated by the Level2 cruise control;
in the Level2 cruise error state calculation (5), inputting a cruise switch state and a cruise control input torque gradient, and activating a torque control request error flag bit if the input torque gradient is too large through filter calculation;
in the wheel-side demand torque calculation (6), after a cruise control input torque gradient is input, a torque gradient limit is performed to obtain the wheel-side demand torque calculated by the Level2 cruise control.
2. The safety monitoring method for hybrid electric vehicle cruising speed closed-loop control LEVEL2 as claimed in claim 1, wherein:
the calculation of the original cruising speed control state of the vehicle comprises the following steps:
inputting parameter quantities of the current vehicle cruising speed control state at the initial input end, including: DTC torque intervention, ESP torque intervention, wheel-side torque change, gearbox gear selection, brake pedal state and vehicle speed monitoring, and cruise state activation calculation (1);
-obtaining said vehicle original cruise speed control state (3) after said cruise state activation via cruise control activation and filtering calculation (2), comprising: a result of a cruise control active state and a result of the cruise control error flag.
3. The safety monitoring method for hybrid electric vehicle cruising speed closed-loop control LEVEL2 as claimed in claim 1, wherein:
and comparing the original cruise vehicle speed control state (3) of the vehicle, the cruise error state calculation (5) of the Level2 and the wheel side demand torque calculation (6) to obtain a monitoring state (4) of Level2 function safety cruise control, feeding back a parameter quantity of the current cruise vehicle speed control state of the vehicle to an initial input end of the original cruise vehicle speed control state of the vehicle through cruise state feedback (7) to perform cruise vehicle speed state closed-loop control, and finally realizing cruise vehicle speed control under the safety monitoring of the Level2 function.
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| CN110843762A (en) * | 2019-11-29 | 2020-02-28 | 安徽江淮汽车集团股份有限公司 | Wheel side torque control method, device, storage medium and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1300276A1 (en) * | 1993-07-29 | 2003-04-09 | Fuji Jukogyo Kabushiki Kaisha | Failure detecting system and method for automatic transmission |
| CN1802273A (en) * | 2003-06-06 | 2006-07-12 | 沃尔沃技术公司 | Method and arrangement for controlling vehicular subsystems based on interpreted driver activity |
| CN107117169A (en) * | 2017-04-28 | 2017-09-01 | 北京新能源汽车股份有限公司 | Control method and device of constant-speed cruise system, controller and automobile |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2016204792A1 (en) * | 2015-06-19 | 2016-12-22 | Allison Transmission Inc. | System and method for minimizing shift cycling for engine operation using cruise control |
| US10474157B2 (en) * | 2017-06-06 | 2019-11-12 | Baidu Usa Llc | Data-based control error detection and parameter compensation system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1300276A1 (en) * | 1993-07-29 | 2003-04-09 | Fuji Jukogyo Kabushiki Kaisha | Failure detecting system and method for automatic transmission |
| CN1802273A (en) * | 2003-06-06 | 2006-07-12 | 沃尔沃技术公司 | Method and arrangement for controlling vehicular subsystems based on interpreted driver activity |
| CN107117169A (en) * | 2017-04-28 | 2017-09-01 | 北京新能源汽车股份有限公司 | Control method and device of constant-speed cruise system, controller and automobile |
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