Idle speed control method
By introducing forced idling and idle timeout shutdown strategies into idle speed control, the problems of excessively fast idling and prolonged idling are solved, thereby achieving engine protection and fuel saving, and improving the reliability and efficiency of idle speed control.
Patent Information
- Application Number
- CN202511417906.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-30
- Publication Date
- 2025-12-19
AI Technical Summary
Existing idling speed control strategies cause excessive idling speed in low-temperature environments, leading to engine mechanical wear. Furthermore, prolonged idling results in severe carbon buildup and fuel waste.
By acquiring the target idle speed final value and engine operating status, the forced idle speed strategy in TSC1 mode is triggered, and the idle timeout shutdown strategy is triggered under preset conditions to limit the idle running time and remind the driver to stop the engine using the fault indicator light.
It avoids mechanical wear caused by excessive idling speed and carbon buildup, oil deterioration, and fuel waste caused by prolonged idling, ensuring that the idling speed is controlled within a reasonable range, preventing the engine from accelerating too early, and improving engine reliability.
Smart Images
Figure CN121162407A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of engine control, more particularly, it relates to a method for idle speed control. BACKGROUND
[0002] The existing idle speed control strategy: when the water temperature, low voltage or air conditioning is used, the idle speed is corrected, the TSC1 signal is output to the ECU to adjust the idle speed, and after the speed signal sent by the TSC1 is received and the high and low idle speed threshold is met, the idle speed immediately takes effect, and no failure strategy is taken after the idle speed runs.
[0003] The existing idle speed control strategy has two shortcomings: 1. After the TSC1 sends the corresponding speed control message, the engine ECU controls the target idle speed to run at the speed corresponding to the TSC1 message immediately, and for low temperature environment, especially the engine of the generator set, the idle speed rises to high speed immediately after starting, but the engine water temperature and oil temperature are not fully heated and lubricated, and the engine is prone to mechanical wear and tear.
[0004] 2. The ECU does not limit the continuous running time of the idle speed, and the engine is prone to serious carbon deposition, oil deterioration, fuel waste and other shortcomings after long-time idle speed running. SUMMARY
[0005] The technical problem to be solved by the present application is to solve the technical problems of the existing idle speed control strategy, such as too fast starting idle speed and long-time idle speed leading to serious engine carbon deposition and mechanical wear and tear.
[0006] The idle speed control method provided by the present application, the method is to obtain a target idle speed final value and an operating state of an engine, when the operating state is an idle state, a forced idle speed strategy in a TSC1 mode is triggered to set the engine speed to the target idle speed final value, and when a preset idle speed timeout shutdown function enabling condition is met, an idle speed timeout shutdown strategy is triggered to shut down in time.
[0007] Further improvement, the forced idle speed strategy in the TSC1 mode is,
[0008] A forced idle speed time is set, the running time of the engine in the idle state is obtained, and when the running time reaches the forced idle speed time, the ECU sets the engine speed to the target idle speed final value.
[0009] Further, the idle timeout stop strategy is to set a first calibration time, when the idle timeout stop function enabling condition is triggered, the first calibration time starts timing; when the first calibration time timing is completed and the ECU does not receive any instruction to change the running state within the first calibration time, the ECU controls the engine to stop fuel injection and controls the fault indicator light to flicker to remind the driver that the engine will be stopped.
[0010] Further, the flickering period of the fault indicator light is a preset second calibration time, and the fault indicator light stops flickering after the engine is stopped.
[0011] Further, the idle timeout stop function enabling condition includes:
[0012] The first enabling condition: the idle timeout function enabling flag is one;
[0013] The second enabling condition: the running state is an idle state;
[0014] The third enabling condition: the running state is in a non-idle fine tuning and non-PTO state;
[0015] The fourth enabling condition: the brake switch is not stepped on;
[0016] The fifth enabling condition: the vehicle speed sensor is not faulty and the real-time vehicle speed obtained by the vehicle speed sensor is less than a preset vehicle speed threshold;
[0017] The sixth enabling condition: the accelerator is not stepped on and the accelerator opening degree is zero;
[0018] The seventh enabling condition: the cooling water temperature exceeds a preset cooling threshold;
[0019] When the first enabling condition, the second enabling condition, the third enabling condition, the fourth enabling condition, the fifth enabling condition, the sixth enabling condition and the seventh enabling condition are simultaneously satisfied, the idle timeout stop strategy is triggered.
[0020] Advantages
[0021] The advantages of the present application are:
[0022] The application obtains a target idle final value and an operating state of an engine, triggers a TSC1 mode forced idle strategy to set the engine speed to the target idle final value when the operating state is an idle state, triggers an idle timeout shutdown strategy and timely shutdown when a preset idle timeout shutdown function enabling condition is met, thereby avoiding problems such as serious carbon deposition, deteriorated oil, fuel waste and the like caused by long-time idle operation, and controlling the forced idle time in the TSC1 mode, avoiding the case that the engine is started to idle under a low-temperature condition of a generator set, the water temperature and oil temperature are too low due to the forced idle time being too short, and the engine is mechanically damaged due to the user increasing the speed to the target speed, and ensuring that the idle continuous operation time is controlled to meet the idle timeout shutdown and the idle operation in the TSC1 mode for a certain time before the speed is increased and the TSC1 forced idle is started. BRIEF DESCRIPTION OF DRAWINGS
[0023] Figure 1 It is an existing idle control logic block diagram;
[0024] Figure 2 It is an idle control logic block diagram of the application;
[0025] Figure 3 It is an idle timeout shutdown strategy logic diagram of the application. DETAILED DESCRIPTION
[0026] The application will be further described below in conjunction with embodiments, but does not constitute any limitation on the application, and any limited-time modification made by anyone within the scope of the claims of the application is still within the scope of the claims of the application.
[0027] Reference Figures 2-3 The idle control method of the application is to obtain a target idle final value and an operating state of an engine, and trigger a TSC1 mode forced idle strategy to set the engine speed to the target idle final value when the operating state is an idle state. The TSC1 mode forced idle strategy ensures that the idle speed is forced to increase to a high speed in the TSC1 mode.
[0028] The TSC1 mode forced idle strategy is to set a forced idle time, and obtain an operating time of the engine in the idle state, and set the engine speed to the target idle final value by the ECU when the operating time reaches the forced idle time.
[0029] The idle timeout shutdown strategy is triggered and timely shutdown is performed when a preset idle timeout shutdown function enabling condition is met.
[0030] The idle timeout shutdown function enabling condition includes:
[0031] The first enabling condition is to set an idle timeout function enabling flag ITO_En_Flg to one.
[0032] The second enabling condition: the running state is an idle state.
[0033] The third enabling condition: the running state is in a non-idle fine tuning and non-PTO state.
[0034] The fourth enabling condition: the brake switch is not stepped on.
[0035] The fifth enabling condition: the vehicle speed sensor is not faulty and the real-time vehicle speed obtained by the vehicle speed sensor is less than a preset vehicle speed threshold.
[0036] The sixth enabling condition: the accelerator is not stepped on and the accelerator opening degree is zero.
[0037] The seventh enabling condition: the cooling water temperature of the engine exceeds a preset cooling threshold.
[0038] When the first enabling condition, the second enabling condition, the third enabling condition, the fourth enabling condition, the fifth enabling condition, the sixth enabling condition and the seventh enabling condition are simultaneously satisfied, the idle timeout shutdown strategy is triggered. If the idle state continues for more than a first calibration time, the ECU will diagnose a timeout, control the fault light to flash, and then shut down the engine.
[0039] The idle timeout shutdown strategy is to set the first calibration time, start timing when the idle timeout shutdown function enabling condition is triggered, and control the engine to stop injecting fuel and control the fault indicator light to flash to remind the driver that the engine will be shut down when the first calibration time is timed and the ECU does not receive any instructions to change the running state within the first calibration time. The idle timeout timing state can be exited at any time before shutdown. The first calibration time in this embodiment is 2 hours. The purpose of setting the idle timeout shutdown strategy is to prevent forced idle time from being too long.
[0040] The flashing period of the fault indicator light is a preset second calibration time, and the fault indicator light stops flashing after the engine is shut down. The second calibration time in this embodiment is 1 minute.
[0041] The above only describes the preferred embodiments of the present application. It should be noted that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which will not affect the effect of the present application and the practicality of the patent.
Claims
1. A method for idling speed control, characterized in that, The method involves setting the idling timeout shutdown function enable condition, obtaining the target idling final value and the engine operating status, and when the operating status is idling, triggering the forced idling strategy in TSC1 mode to set the engine speed to the target idling final value. When the idling timeout shutdown function enable condition is met, triggering the idling timeout shutdown strategy to shut down the engine in a timely manner.
2. The idle speed control method according to claim 1, characterized in that, The forced idling strategy in the TSC1 mode is to set a forced idling time, obtain the running time of the engine in the idling state, and when the running time reaches the forced idling time, the ECU sets the engine speed to the target final idling value.
3. The idle speed control method according to claim 1, characterized in that, The idle timeout shutdown strategy is as follows: a first calibration time is set. When the idle timeout shutdown function is enabled, the first calibration time starts counting down. When the first calibration time is completed and the ECU does not receive any instruction that needs to change the operating state within the first calibration time, the ECU controls the engine to stop injecting fuel and controls the fault indicator light to flash to remind the driver that the engine will be shut down.
4. The idle speed control method according to claim 3, characterized in that, The flashing period of the fault indicator light is a preset second calibration time, and the fault indicator light stops flashing after the engine stops.
5. The idle speed control method according to claim 1, characterized in that, The conditions for enabling the idle timeout shutdown function include: First enabling condition: Idle timeout function activation flag position 1; Second enabling condition: The operating state is idling; Third enabling condition: The operating state is in a non-idle fine-tuning and non-PTO state; Fourth enabling condition: The brake switch is not depressed; Fifth enabling condition: The vehicle speed sensor is fault-free and the real-time vehicle speed obtained by the vehicle speed sensor is less than the preset vehicle speed threshold. Sixth enabling condition: The accelerator pedal is not depressed and the accelerator pedal opening is zero; Seventh enabling condition: The engine's coolant temperature exceeds a preset cooling threshold; When the first enabling condition, the second enabling condition, the third enabling condition, the fourth enabling condition, the fifth enabling condition, the sixth enabling condition, and the seventh enabling condition are met simultaneously, the idle timeout shutdown strategy is triggered.