Intelligent dormancy control method of electronic parking brake system

Abstract

The invention relates to the technical field of braking systems, in particular to an intelligent dormancy control method of an electronic parking braking system. The method comprises the following steps: judging whether wakeup duration exceeds 5s or not, and if so, considering that the wakeup is in a current wakeup cycle; otherwise, entering new wake-up cycle initialization; whether the calipers have new actions or not is judged, and if yes, the parking state continues to be judged; otherwise, dormancy is performed after 5s; whether the state of the calipers is clamping or releasing is judged, and if the state is clamping, the calipers enter a dormancy state after further calculation; otherwise, dormancy is performed after 5s; judging whether the previous cycle is normally powered off or not, if so, judging the parking state and implementing the strategy according to the gradient priority until the parking state is dormant; otherwise, the parking state is judged after the gradient and the temperature are set to be default values; whether the state of the calipers is clamping or releasing is judged, and if the state is clamping, the calipers enter a dormancy state after further calculation; otherwise, dormancy is performed after 5s. Compared with the prior art, the method has the advantages that safe parking of the vehicle can be guaranteed, power consumption of the vehicle is reduced, and safety and economical efficiency of the vehicle are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of brake systems, in particular to an intelligent dormancy control method for an electronic parking brake system. Background Art

[0002] When a vehicle equipped with an electronic parking brake is parked, the electronic parking controller typically transitions from awake mode to sleep mode within a specified timeframe. In existing technology, this timeframe is typically 1 minute or 15 minutes. While different application designs may have different timeframes, most implementations use a fixed duration, without additional control methods to intelligently adjust the sleep timeframe (which should be neither too long nor too short).

[0003] If the controller wake-up time is too short, such as 1 minute as mentioned above, the vehicle may roll after the controller switches to sleep mode due to changes in vehicle status, such as a change in parking slope or degradation of actuator performance, causing damage to the vehicle or personnel.

[0004] If the controller wake-up time remains too long, such as 15 minutes as mentioned above, other network-managed controllers in the car will also remain awake at the same time, resulting in a large loss of car power consumption. In severe cases, the car battery may be overcharged, affecting vehicle startup and reducing the vehicle's range, especially new energy vehicles. Summary of the Invention

[0005] In order to overcome the deficiencies of the prior art, the present invention provides an intelligent dormancy control method for an electronic parking brake system, which can ensure safe parking of a vehicle, reduce power consumption of the vehicle, and improve the safety and economy of the vehicle.

[0006] To achieve the above objectives, an intelligent dormancy control method for an electronic parking brake system is designed, including a parking brake system controller, characterized in that the specific control method is as follows: S1, start; S2, the parking brake system controller determines whether the wake-up duration exceeds 5s, if yes, proceeds to step S3; otherwise, jumps to step S9; S3, the parking brake system controller considers that it is already in the current wake-up cycle; S4, the parking brake system controller determines whether the brake caliper has new movement, if yes, proceeds to step S5; otherwise, jumps to step S8; S5, the parking brake system controller determines whether the brake caliper is in a clamped state or a released state. If it is in a clamped state, the controller proceeds to step S6; otherwise, the controller jumps to step S14; S6, obtaining the current vehicle longitudinal acceleration signal and calculating the vehicle's current road slope and current brake disc temperature; S7, based on the data of step S6 and combined with Table 1, it is determined that sleep is allowed after the specified time; S8, allows sleep after 5s; S9, the parking brake system controller enters a new wake-up cycle initialization; S10, the parking brake system controller determines whether the power is turned off normally in the previous cycle, if yes, then proceeds to step S11; otherwise, jumps to step S15; S11, the parking brake system controller determines whether the brake caliper is in a clamped state or a released state. If it is in a clamped state, the controller proceeds to step S12; otherwise, the controller jumps to step S14; S12, calculating the current slope of the vehicle; S13, implementing strategies based on the calculation priority of the slope; S14, the brake caliper is in the released state and is allowed to sleep after 5 seconds; S15, setting the vehicle slope and brake disc temperature to default values; S16, the parking brake system controller determines whether the brake caliper is in a clamped state or a released state. If it is in a clamped state, the controller proceeds to step S17; otherwise, the controller jumps to step S14; S17, according to the default value of step S15, combined with Table 2, it is determined that sleep is allowed after the specified time.

[0007] Table 1 is a comparison table of slope, brake disc temperature and dormancy time.

[0008] Table 2 is a comparison table of initialization slope and sleep time.

[0009] In step S13, the slope calculation priority implementation strategy process is as follows: S131, determine whether the slope stored in the ECU memory is a valid value, if yes, proceed to step S132; otherwise, jump to step S133; S132, using the slope in the memory and jumping to step S136; S133, determine whether the vehicle acceleration signal is valid, if so, proceed to step S134; otherwise, jump to step S135; S134, calculate the slope using the vehicle acceleration signal, and jump to step S136; S135, setting the slope value to a default slope value and jumping to S136; S136, combined with Table 2, it is determined that sleep is allowed after the specified time.

[0010] Compared with the prior art, the present invention provides an intelligent dormancy control method for an electronic parking brake system, which can ensure safe parking of a vehicle, reduce power consumption of the vehicle, and improve the safety and economy of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a control flow chart of the present invention.

[0012] Figure 2 This is a comparison table of slope, brake disc temperature and sleep time in the present invention.

[0013] Figure 3 This is the initialization slope and sleep time comparison table in the present invention.

[0014] Figure 4 This is a schematic diagram of practical case 1 of the present invention.

[0015] Figure 5 This is a schematic diagram of practical case 2 of the present invention. DETAILED DESCRIPTION

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] like Figures 1 to 3 As shown, an intelligent dormancy control method for an electronic parking brake system is described. The specific control method is as follows: S1, start; S2, the parking brake system controller determines whether the wake-up duration exceeds 5s, if yes, proceeds to step S3; otherwise, jumps to step S9; S3, the parking brake system controller considers that it is already in the current wake-up cycle; S4, the parking brake system controller determines whether the brake caliper has new movement, if yes, proceeds to step S5; otherwise, jumps to step S8; S5, the parking brake system controller determines whether the brake caliper is in a clamped state or a released state. If it is in a clamped state, the controller proceeds to step S6; otherwise, the controller jumps to step S14; S6, obtaining the current vehicle longitudinal acceleration signal and calculating the vehicle's current road slope and current brake disc temperature; S7, based on the data of step S6 and combined with Table 1, it is determined that sleep is allowed after the specified time; S8, allows sleep after 5s; S9, the parking brake system controller enters a new wake-up cycle initialization; S10, the parking brake system controller determines whether the power is turned off normally in the previous cycle, if yes, then proceeds to step S11; otherwise, jumps to step S15; S11, the parking brake system controller determines whether the brake caliper is in a clamped state or a released state. If it is in a clamped state, the controller proceeds to step S12; otherwise, the controller jumps to step S14; S12, calculating the current slope of the vehicle; S13, implementing strategies based on the calculation priority of the slope; S14, the brake caliper is in the released state and is allowed to sleep after 5 seconds; S15, setting the vehicle slope and brake disc temperature to default values; S16, the parking brake system controller determines whether the brake caliper is in a clamped state or a released state. If it is in a clamped state, the controller proceeds to step S17; otherwise, the controller jumps to step S14; S17, according to the default value of step S15, combined with Table 2, it is determined that sleep is allowed after the specified time.

[0018] In step S13, the slope calculation priority implementation strategy process is as follows: S131, determine whether the slope stored in the ECU memory is a valid value, if yes, proceed to step S132; otherwise, jump to step S133; S132, using the slope in the memory and jumping to step S136; S133, determine whether the vehicle acceleration signal is valid, if so, proceed to step S134; otherwise, jump to step S135; S134, calculate the slope using the vehicle acceleration signal, and jump to step S136; S135, setting the slope value to a default slope value and jumping to S136; S136, combined with Table 2, it is determined that sleep is allowed after the specified time.

[0019] like Figure 2 Table 1, used in the control method above, shows a table comparing slope, brake disc temperature, and sleep time. The times within each zone in this table are default values and are not specific. Each time in this table can be adjusted based on slope and brake disc temperature. The slope and brake disc temperature matrix in this table can be adjusted based on actual needs.

[0020] like Figure 3 Table 2, used in the control method above, is a table comparing initialization slopes and sleep times. The times within each range in this table are default values and are not specific. Each time in this table can be adjusted based on actual needs. Each slope range in this table can also be adjusted based on actual needs.

[0021] like Figure 4As shown, in one project, after detecting "① new caliper movement," the caliper status is determined. If "② the caliper is determined to be released," sleep is allowed after "③ a duration of 10 seconds," meaning "④ the sleep flag changes from not allowing sleep to allowing sleep." This time is adjustable. While the "5s" shown in the flowchart is "5s," this project is set to 10s.

[0022] like Figure 5 As shown, in a certain project, after detecting "① new caliper movement", the caliper status is determined. If "② the caliper status is determined to be clamped", the process continues with "③ determining the slope" and "④ determining the brake disc temperature". In this case, the slope is calculated to be 36%, and the brake disc temperature is 274°C. After "⑤ a duration of 600 seconds", sleep is allowed, i.e., "⑥ sleep-allowed flag: changes from not allowing sleep to allowing sleep". This time is adjustable. According to Table 1, it is 500 seconds, but in this actual project, it is adjusted to 600 seconds.

Claims

1. An intelligent dormancy control method for an electronic parking brake system, comprising a parking brake system controller, characterized in that: The specific control methods are as follows: S1, start; S2, the parking brake system controller determines whether the wake-up duration exceeds 5s, if yes, proceeds to step S3; otherwise, jumps to step S9; S3, the parking brake system controller considers that it is already in the current wake-up cycle; S4, the parking brake system controller determines whether the brake caliper has new movement, if yes, proceeds to step S5; otherwise, jumps to step S8; S5, the parking brake system controller determines whether the brake caliper is in a clamped state or a released state. If it is in a clamped state, the controller proceeds to step S6; otherwise, the controller jumps to step S14; S6, obtaining the current vehicle longitudinal acceleration signal and calculating the vehicle's current road slope and current brake disc temperature; S7, based on the data of step S6 and combined with Table 1, it is determined that sleep is allowed after the specified time; S8, allows sleep after 5s; S9, the parking brake system controller enters a new wake-up cycle initialization; S10, the parking brake system controller determines whether the previous cycle was a normal power-off, and if so, proceeds to step S11; Otherwise jump to step S15; S11, the parking brake system controller determines whether the brake caliper is in a clamped state or a released state. If it is in a clamped state, the controller proceeds to step S12; otherwise, the controller jumps to step S14; S12, calculating the current slope of the vehicle; S13, implementing strategies based on the calculation priority of the slope; S14, the brake caliper is in the released state and is allowed to sleep after 5 seconds; S15, setting the vehicle slope and brake disc temperature to default values; S16, the parking brake system controller determines whether the brake caliper is in a clamped state or a released state. If it is in a clamped state, the controller proceeds to step S17; otherwise, the controller jumps to step S14; S17, according to the default value of step S15, combined with Table 2, it is determined that sleep is allowed after the specified time.

2. The intelligent dormancy control method for an electronic parking brake system according to claim 1, characterized in that: Table 1 is a comparison table of slope, brake disc temperature and dormancy time.

3. The intelligent dormancy control method for an electronic parking brake system according to claim 1, characterized in that: Table 2 is a comparison table of initialization slope and sleep time.

4. The intelligent dormancy control method for an electronic parking brake system according to claim 1, characterized in that: In step S13, the slope calculation priority implementation strategy process is as follows: S131, determine whether the slope stored in the ECU memory is a valid value, if yes, proceed to step S132; otherwise, jump to step S133; S132, using the slope in the memory and jumping to step S136; S133, determine whether the vehicle acceleration signal is valid, if so, proceed to step S134; Otherwise, jump to step S135; S134, calculate the slope using the vehicle acceleration signal, and jump to step S136; S135, setting the slope value to a default slope value and jumping to S136; S136, combined with Table 2, it is determined that sleep is allowed after the specified time.

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