Rotating speed control method of automobile engine
A car engine and speed control technology, applied in the direction of transmission control, mechanical equipment, components with teeth, etc., can solve the problems of shifting shock, long synchronization time, engine speed speed, etc., to achieve weakening consistency and wear , to ensure accuracy, and to improve drivability quality
Active Publication Date: 2020-12-29
CHONGQING CHANGAN AUTOMOBILE CO LTD
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Problems solved by technology
[0002] Vehicles equipped with dual-clutch transmissions have high requirements on engine speed when starting and shifting gears, and generally have the following problems: (1) During the gear shifting process, if the engine speed is synchronized with the transmission input shaft speed for a long time or cannot be synchronized It is easy to cause shift shock; (2) If the clutch oil pressure hysteresis is serious at low temperature, it is easy to cause problems such as rapid engine speed at start, impact and slow start response. At the same time, the poor consistency and serious wear of the clutch hardware will aggravate the problem; therefore , the engine speed needs to reach the target speed quickly and accurately within a predetermined time, and the accuracy of engine speed control directly affects the drivability quality
Method used
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[0021] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0022] Such as Figure 1 to Figure 4 The vehicle engine speed control method shown includes:
[0023] The first step is to judge the current working mode
[0024] The engine control unit 1 obtains the accelerator opening, vehicle speed, target gear signal, actual gear signal, shift process signal, speed request signal, actual engine speed V a , the target engine speed V d , the synchronization time St (that is, the time required for the actual speed of the engine to reach the target speed) and the engagement torque T of the clutch c (Wherein, the rotational speed request signal, the target rotational speed V of the engine d , synchronization time St and clutch engagement torque T cThe transmission control unit 2 sends it to the engine control unit 1), and judges whether the current working mode belongs to the starting mode according to the accelerator opening, v...
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The invention discloses an rotating speed control method of an automobile engine. The rotating speed control method comprises the following steps that 1, a current working condition mode is judged, 2,the basic torque under the current working condition mode is calculated, 3, the inertia torque required by rotating speed change and torque required for realizing rotating speed closed loop are calculated, 4, the engine target torque under the current working condition mode is calculated, and 5, an engine control unit controls an engine to operate according to the engine target torque. Accordingto the rotating speed control method of the automobile engine, the drivability of a dual-clutch transmission can be optimized, and meanwhile the influence caused by consistency and abrasion of clutchhardware is weakened.
Description
technical field [0001] The invention belongs to the field of automobile engine control, and in particular relates to a method for controlling the rotational speed of an automobile engine. Background technique [0002] Vehicles equipped with dual-clutch transmissions have high requirements on engine speed when starting and shifting gears, and generally have the following problems: (1) During the gear shifting process, if the engine speed is synchronized with the transmission input shaft speed for a long time or cannot be synchronized It is easy to cause shift shock; (2) If the clutch oil pressure hysteresis is serious at low temperature, it is easy to cause problems such as rapid engine speed at start, impact and slow start response. At the same time, the poor consistency and serious wear of the clutch hardware will aggravate the problem; therefore , the engine speed needs to reach the target speed quickly and accurately within a predetermined time, and the accuracy of engine...
Claims
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Login to View More IPC IPC(8): F16H61/04F16H63/50
CPCF16H61/0437F16H63/502
Inventor 温文武胡显力王雄
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD